• TABLE OF CONTENTS
HIDE
 Front Cover
 Introduction
 Methodology
 Dependability of precipitation
 Classification of moisture...
 Discussion and conclusion
 Table 1: Precipitation and moisture...
 Table 2: Potential evapotranspiration...
 Table 3: Mean daily potential evapotranspiration...
 References
 Computer program for producing...
 Computer program for daily potential...






Title: Moisture adequacies for agriculture in the Southeast
CITATION PAGE IMAGE ZOOMABLE PAGE TEXT
Full Citation
STANDARD VIEW MARC VIEW
Permanent Link: http://ufdc.ufl.edu/UF00055240/00001
 Material Information
Title: Moisture adequacies for agriculture in the Southeast
Physical Description: 34 p. : ; 28 cm.
Language: English
Creator: Hargreaves, George H.
Council of U.S. Universities for Soil and Water Development in Arid and Sub-humid Areas
Publisher: Utah State University
Place of Publication: Logan
Publication Date: 1975
 Subjects
Subject: Water-supply, Agricultural -- United States   ( lcsh )
Agriculture -- United States   ( lcsh )
Genre: non-fiction   ( marcgt )
 Notes
Statement of Responsibility: George H. Hargreaves.
General Note: Cover title.
General Note: Done in cooperation with CUSUSWASH.
Funding: Electronic resources created as part of a prototype UF Institutional Repository and Faculty Papers project by the University of Florida.
 Record Information
Bibliographic ID: UF00055240
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 08803166

Table of Contents
    Front Cover
        Front Cover
    Introduction
        Page 1
    Methodology
        Page 2
    Dependability of precipitation
        Page 3
    Classification of moisture deficits
        Page 4
    Discussion and conclusion
        Page 5
    Table 1: Precipitation and moisture availability for the Southeast
        Page 6
        Page 7
        Page 8
        Page 9
        Page 10
        Page 11
        Page 12
        Page 13
        Page 14
        Page 15
        Page 16
        Page 17
        Page 18
        Page 19
        Page 20
        Page 21
        Page 22
        Page 23
        Page 24
        Page 25
        Page 26
        Page 27
    Table 2: Potential evapotranspiration factor in inches per month
        Page 28
    Table 3: Mean daily potential evapotranspiration in inches per day - Montgomery, Alabama
        Page 29
        Page 30
    References
        Page 31
    Computer program for producing table 1
        Page 32
        Page 33
    Computer program for daily potential evapotranspiration
        Page 34
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MOISTURE ADEQUACIES FOR AGRICULTURE IN THE SOUTHEAST

By George II. Hargreaves, F. ASCE


INTRODUCTION

Good crops are normally produced throughout the Southeastern
States without irrigation. However, yields are generally significantly
below levels possible with adequate moisture supplies. A numerical
evaluation of monthly moisture adequacies or deficits has been made
that shows the moisture adequacies and the potential requirements for
supplemental irrigation in a number of states. The states considered
are Alabama, Arkansas, Florida, Georgia, Kentucky, Louisiana, Virginia
and West Virginia.

A precise evaluation of moisture adequacies requires a daily or
short time period evaluation of moisture requirements and of moisture
availability. A daily evaluation can be made from the climate of a
given area and analyzed with respect to requirements for supplemental
irrigation. Whether for a monthly or shorter time period an evaluation
of moisture adequacies requires a knowledge of crop evapotranspiration,
soil moisture characteristics and rainfall available for plant use.
However, studies based on daily data or five day means are time
consuming and for that reason are seldom applied over large areas.
For regional studies some generalizations, including the use of monthly
averages and monthly indices, may be more appropriate.

In order to approximately evaluate the needs for supplemental
irrigation over the 13 state area the use of computed monthly moisture
availability indices was employed. The precision of this procedure
can be improved through correlation with locally more detailed analyses
utilizing daily data or five day mean values and through greater use of
moisture availability-yield relationships.



1Research Engineer, Agricultural and Irrigation Engineering, Utah
State University, Logan, Utah.

NOTE: The work presented herein was financed in part by the
Agency for International Development through its contract AID/ta-c-1103
with Utah State University. The views presented herein are those of
the author and do not necessarily represent those of the Agency for
International Development or Utah State University.

Paper published in "Contribution of Irrigation and Drainage to
World Food Supply" Proceedings of the ASCE Irrigation and Drainage
Specialty Conference, August 14-16, 1974, Biloxi, Mississippi.











METHODOLOGY

Mean monthly temperature data for the area are given by
Wernstedt (7) The mean monthly values of relative humidity needed
for good ET estimation are less readily available. Maps showing
monthly relative humidity means are presented by the Environmental Data
Service (1). These maps give lines of equal humidity means to the
nearest 10 percent. Interpolation between values is possible.
However, the accuracy is probably not great. The maps, however,
provide a good source for rapidly obtaining approximate values of
relative humidity. The Environmental Science Services Administration
(2) have published mean precipitation and various levels of
probabilities of precipitation for 23 states.

For the 13 states selected for this study, the climatic stations
and divisions corresponding to those selected by the Environmental
Science Administration were used. Mean temperature, mean relative
humidity, mean precipitation and the 75 percent probability of
occurrence of precipitation (precipitation equaled or exceeded three
years out of four) were punched on computer cards. The header cards
consisted of the station or division name, the latitude and the
number of years of record. Details of the computer program are given
in Appendix II.

The computer printout of moisture adequacy analysis for the 13
state area is presented as Table 1, and gives mean temperature in
degree Fahrenheit, TM; mean relative humidity in percent, HM; mean
precipitation, PREC; dependable precipitation, PD, (the 75 percent
probability of precipitation); potential evapotranspiration, ETP; a
moisture deficit or evapotranspiration deficit, ETDF; and a moisture
availability index, MAI.

Potential evapotranspiration, ETP, given in Table 1 as POT ET is
calculated from the latitude, mean temperature, TM, and mean relative
humidity, HM, from an equation given by Hargreaves (4). Details of the
calculations with explanations on comment cards are presented in
Appendix II, Computer Program for Calculating Table 1. The equation
can be written:

ETP = MF x TM x CH (1)

in which MF is a monthly correction factor related to latitude, TM is
mean monthly temperature in degrees Fahrenheit and CH is a correction
for relative humidity. The equation for CH is
CH = 0.166 (100-HM)1/2 (la)

with maximum value of CH = 1.00. Values of MF are given in Table 2
for the latitudes encountered in the United States.


2Numerals in parentheses refer to corresponding items in the
Appendix I References.










The moisture deficit, ETDF, as defined by Hargreaves (3) is given
by the equation

ETDF = PD ETP (2)

where PD is the 75 percent probability of occurrence as defined above.
The moisture availability index, MAI, described by Hargreaves (3), is
obtained from the equation

MAI = PD/ETP (3)

For each state or division, a regression analysis was made showing PD
as a function of PREC, the average monthly precipitation. The
regression equations are presented in Table 1, together with the R
squared values.

Some soils store limited amounts of readily available moisture in
the crop root zone. During periods of maximum water use the soil
moisture reservoir may be adequate to meet crop requirements for only
six to eight days. For these conditions an inspection or statistical
analysis of daily precipitation records may be desirable.

In order to provide for a comparison of precipitation with mean
daily evapotranspiration a computer program was developed to estimate
daily evapotranspiration. Some approximations were made. Mean
monthly relative humidity was used as representative for the daily
values. Mean daily temperatures were calculated from the monthly
means. These procedures and the equations for calculating mean daily
potential evapotranspiration are presented as Appendix III, Computer
Program for Daily Potential Evapotranspiration.

Values of calculated mean daily potential evapotranspiration for
one location, Montgomery, Alabama, are given in Table 3. Some slight
discontinuity will be noted due largely to the methods for estimating
daily temperature and relative humidity from monthly means.

DEPENDABILITY OF PRECIPITATION

There are significant differences in daily or weekly precipitation
distribution in the Southeast. Adequacy of mean precipitation does
not guarantee adequacy of either amount or distribution. An example
of an extreme case of monthly precipitation distribution can be cited
for the rainfall station at Conceicao, Paraiba, Brazil. The climate
of Northeast Brazil is more erratic and unpredictable than that for
the Southeastern States of the United States and illustrates an
extreme of distribution. The potential evapotranspiration at
Conceicao for February is estimated to be 6.0 inches. Mean rainfall
for a 56 year period is 7.0 inches or 1.16 percent of adequacy. How-
ever, the period of record contains three years of zero rainfall
during February, 13 years of less than one-third adequacy, six years
with more than 12 inches and one year with more than 52 inches during
this month. A probability analysis of rainfall distribution compared
with potential evapotranspiration will be much more useful in
evaluating moisture availability than mean precipitation.










In the analysis of moisture adequacies for agricultural
production, and in developing the needs and requirements for
irrigation, the 75 percent probability of occurrence or "dependable
precipitation," defined by Hargreaves (3) is used. For supplemental
irrigation development, the rainfall that may be expected to occur
three years out of four is a reasonable value for most crops. Some
deficit during one year in four can usually be economically tolerated,
particularly when each month is assigned this same level of probability.
For some high value crops or special conditions, a higher level of
probability of occurrence may be desirable.

The concept of precipitation probability is combined with
potential evapotranspiration to provide a moisture availability index,
MAI, (Equation 3) which is a dependable indication of the degree of
moisture adequacy at the specified probability level.

In locations with variable climates, more study and analysis is
desirable with respect to the relationships between monthly
probabilities and daily or short time period distribution. Those
locations having wide variations in monthly totals will tend to have
more erratic distribution of precipitation within the months.

The probability analysis makes it possible to relate dependability
of amounts of precipitation to yield and to the economics of making
up the deficits through supplemental irrigation. Correlating MAI with
yields from a wide variety of crops will increase the usefulness
of this index in the analysis of local irrigation problems.

CLASSIFICATION OF MOISTURE DEFICITS

Hargreaves (3) proposed the following classification for
evaluating moisture adequacy or deficit:

Range in MAI Classification
0.00 to 0.33 Very deficient
0.34 to 0.67 Moderately deficient
0.68 to 1.00 Somewhat deficient
1.01 to 1.33 Adequate
1.34 and above Excessive

Mirnezami (6) found a high level of correlation between MAI and
yield of dry farmed wheat. Response of other non-irrigated crops is
expected to be similar. In the very deficient range the response of
dry farmed wheat to fertilizer application was not positive.
Adequate moisture is of greater importance during the flowering,
pollinization, fruiting and fruit on grain sizing stages. Values
of MAI in the very deficient range during these periods are considered
to be danger signals. The economics of applying supplemental
irrigation during these critical periods should be further investigated
and similar studies on a range of Southeastern crops would be valuable.
An inspection of Table 1 indicates that most locations and divisions
in the Southeast have months that are very deficient during critical
periods. Dependable evaluations of MAI provide important assistance
in planning supplemental irrigation developments.








5

DISCUSSION

For most of the Southeast, May is a critical month. An inspection
of Table 1 indicates that when rainfall is very deficient in May it is
also very deficient or moderately deficient in April. For this reason
there usually will not be very much carry over soil moisture at the
beginning of May. June is also critical for some crops.

A review of the climatic data analysis given in Table 1 shows that
rainfall is very deficient during May for 35 percent of the area or In
37 stations or divisions. June is very deficient for 41 stations,
38 percent of the area. May and June are both deficient for 11
stations, or 10 percent of the area. May and/or June are very deficient
for 67 locations or 63 percent of the area. This analysis was not made
to determine the exact area of coverage but seems to indicate that
nearly two thirds of the Southeast suffers from severe moisture deficits
during either May or June. The probability of having less than a third
adequacy one year in four is seriously limiting on crop production and
economic development of the region.

The above analysis was made on a mean monthly basis, however,
distribution of precipitation within the month is also of considerable
importance. Studies by Hargreaves and Christiansen (5), show that
rainfall at the level of only one third of adequacy, if evenly
distributed throughout the month, may maintain production of some
crops at about 41 percent of optimum.

It should be noted that values of MAI of less than 0.34 are quite
limiting to crop production regardless of rainfall distribution within
a month. Also, in general, with lower values of MAI, undesirable
distribution becomes more probable.

If irrigation water can be economically supplied then irrigation
development should be considered as a means of making up any serious
moisture deficits shown by this analysis, particularly during months
that are critical for good crop production.

CONCLUSION

Moisture availability indices based upon precipitation probabilities
(the 75 percent probability of occurrence) are presented for the 13
Southeastern States. These indices, based upon monthly precipitation
and climatic data, provide an indication of the probability that rainfall
will be adequate in supplying moisture requirements equal to potential
evapotranspiration.

Further study is recommended in comparing the distribution of
precipitation throughout the months from daily data with these monthly
indices. Other studies should relate moisture deficits and moisture
availability indices, MAI, to yields or to reduction in yields and
also to the economic considerations relative to providing supplemental
irrigation for very deficient months.















TABLE 1 PRECIPITATION AND MOISTURE AVAILABILITY FOR THE SOUTHEAST


MONTGOMERY ALABAMA LAT 32 18 37 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 49. 52. ST. 65. 73. 80. 82. 82. 77. 66. 55. 49. 66.
MEAN R.H. 77. 75. 70. 72. 73. 73. 76. 77. 76. 74. 73. 76. 74.
MEAN PREC 4.18 4.60 5.97 4.71 3.23 4.06 5.12 3.89 4.01 2.31 3.07 4.90 50.05
PREC DEP 2.65 3.02 3.94 2.47 1.89 2.68 3.58 3.34 1.67 .68 1.33 3.03
POT ET 1.59 2.08 3.76 5.20 7.00 7.98 7.76 6.70 4.99 3.39 2.03 1.48 53.97
ETOF -1.06 -.94 -.18 2.73 5.11 5.30 4.18 3.36 3.32 2.71 .70 -1.55 27.42
MAI 1.67 1.45 1.05 .47 .27 .34 .46 .50 .33 .20 .65 2.04
PD = -1.075 + .863 PREC
RS=.7830


ALABAMA PRAIRIE DIVISION LAT 32 20 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR l.

MEAN TEMP 49. 52. 57. 65. 73. 80. 82. 82. 77. 66. 55. 49. 66.
MEAN R.H. 77. 75. 70. 72. 73. 73. 76. 77. 76. 74. 73. 76. 74.
MEAN PREC 4.52 4.72 6.29 5.13 3.41 3.94 5.41 3.97 3.23 2.20 3.23 5.00 51.05
PREC DEP 3.06 3.39 4.66 3.13 1.98 2.75 4.16 2.53 1.84 .86 1.66 3.22
POT ET 1.53 2.08 3.76 5.20 7.00 7.98 7.76 6.70 4.99 3.39 2.03 1.48 53.96
ETOF -1.48 -1.31 -.90 2.07 5.02 5.23 3.60 4.17 3.15 2.53 .37 -1.74 26.15
MAI 1.93 1.63 1.24 .60 .28 .34 .54 .38 .37 .25 .82 2.17
PD = -1.164 + .925 PREC
RSQ=.9606


ALABAMA NORTHERN VALLEY DIVISION LAT 34 30 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 42. 45. 51. 62. 70. 78. 80. 80. 73. 62. 50. 44. 61.
MEAN R.H. 74. 72. 70. 66. 68. 70. 76. 76. 73. 70. 70. 70. 71.
MEAN PREC 5.44 4.96 6.04 4.63 3.41 3.65 4.40 3.48 3.27 2.68 3.91 5.00 50.87
PREC DEP 3.38 3.07 4.34 3.22 2.20 2.30 3.02 2.28 1.83 1.16 2.24 3.04
POT ET 1.32 1.79 3.25 5.42 7.37 8.33 7.67 6.68 4.90 3.26 1.80 1.35 53.14
ETOF -2.06 -1.28 -1.09 2.20 5.17 6.03 4.65 4.40 3.07 2.10 -.44 -1.69 27.61
MAT 2.56 1.72 1.33 .59 .30 .28 .39 .34 .37 .36 1.24 2.25
PD = -.746 .807 PREC
RS0=.9345


ALABAMA APPALACHIAN MOUNTAIN DIVISION LAT 34 30 35 "YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 45. 47. 52. 62. 69. 77. 79. 79. 73. 62. 51. 45. 62.
MEAN R.H. 74. 72. 70. 66. 68. 71.. 76. 76. 75. 70. 70. 72. 72.
MEAN PREC 5.54 4.56 6.36 4.89 3.44 4.02 '4.95 3.93 3.10 2.81 4.00 5.20 52.80
PREC DEP 3.49 2.20 4.91 3.34 2.28 2.86 3.42 2.74 1.71 1.12 2.31 3.22
POT ET 1.42 1.87 3.32 5.42 7.26 8.08 7.57 6.59 4.72 3.26 1.84 1.34 52.67
ETDF -2.07 -.33 -1.59 2.08 4.98 5.22 4.15 3.85 3.01 2.14 -.47 -1.88 25.42
MAI 2.46 1.18 1.48 .62 .31 .35 .45 .42 .36 .3% 1.26 2.41
PD = -1.066 + .879 PREC
RSQ=.8694


ALABAMA UPPER PLAINS DIVISION LAT 33 40 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 45. 48. 54. 63. 71. 78. 81. 80. 74. 63. 52. 45. 63.
MEAN R.H. 75. 73. 70. 68. 70. 72. 76. ,77. 75. 70. 70. 72. 72.
MEAN PREC 5.38 5.00 6.35 5.15 3.61 4.20 5.20 4.18 3.16 2.49 3.65 5.24 53.61
PREC DEP 3.54 3.15 4.97 3.38 2.29 2.99 3.72 2.76 1.82 .99 2.14 3.32
POT ET 1.44 1.92 3.49 5.36 7.21 8.00 7.73 6.53 4.82 3.37 1.93 1.39 53.20
ETOF -2.10 -1.23 -1.48 1.98 4.92 5.01 4.01 3.77 3.00 2.38 -.21 -1.93 25.08
MAI 2.46 1.64 1.42 .63 .32 .37 .48 .42 .38 .29 1.11 2.40
PO = -1.139 .909 PREC
RS-=.9556















TABLE 1 PRECIPITATION AND MOISTURE AVAILABLE ITY FOR THE SOUTHEAST


ALABAMA EASTERN VALLEY DIVISION LAT 33 30 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR A

MEAN TEMP 46. 49. 52. 62. 70. 77. 80. 79. 63. 73. 51. 45. 62.
MEAN R.H. 75. 73. 70. 67. 68. 71. 74. 78. 79. 70. 70. 71. 72.
MEAN PREC 5.33 5.33 6.31 5.04 3.15 4.29 4.89 4.05 3.22 2.57 '.41 5.19 52.78
PREC DEP 3.47 3.75 4.84 3.23 1.81 3.04 3.34 2.74 1.68 .99 1.92 3.02
POT ET 1.48 1.97 3.37 5.36 7.34 8.02 7.93 6.31 3.75 3.94 1.90 1.42 52.79
ETDF -1.99 -1.78 -1.47 2.13 5.53 4.98 4.59 3.57 2.07 2.95 -.02 -1.60 25.81
MAI 2.34 1.90 1.44 .60 .25 .38 .42 .43 .45 .25 1.01 2.13
PD = -1.199 + .914 PREC
RSQ=.9486


ALABAMA PIEDMONT PLATEAU DIVISION LAT 33 0 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 47. 50. 55. 63. 70. 77. 79. 78. 73. 63. 52. 46. 63.
MEAN R.H. 77. 75. 70. 68. 70. 71. 76. .78. 76. 71. 70. 74. 73.
MEAN PREC 4.96 5.06 6.51 5.48 3.32 '4.16 5.33 '4.40 3.48 2.26 3.47 5.10 53.53
PREC DEP 3.26 3.52 5.03 3.45 2.00 3.08 3.94 3.02 1.96 .70 1.78 3.16
POT ET 1.48 1.96 3.59 5.37 7.09 7.99 7.50 6.22 4.69 3.36 1.98 1.40 52.64
ETDF -1.78 -1.56 -1.44 1.92 5.09 4.91 3.56 3.20 2.73 2.66 .20 -1.76 24.27
MAI 2.20 1.80 1.40 .64 .28 .39 .53 .49 .42 .21 .90 2.25
PO = -1.315 .947 PREC
RSG=.9501


ALABMA COASTAL PLAIN DIVISION' LAT 31 30 35 YEARS

JAN FEB MAR APR MAY JUN JUL 'AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 51. 53. 58. 66. 73. 80. 80. 80. 77. 68. 57. 51. 66.
MEAN R.H. 78. 76. 72. 71. 71. 75. 78. 79. 79. 74. 73. 79. 75.
MEAN PREC 4.65 4.66 6.30 5.51 3.91 4.64 6.75 5.16 4.34 2.21 3.36 5.09 56.58
PREC DEP 3.08 3.19 4.10 3.56 2.33 3.30 5.29 3.57 2.77 .73 1.64 3.26
POT ET 1.66 2.12 3.74 5.39 7.23 7.63 7.20 6.24 4.70 3.56 2.17 1.49 53.13
ETDF -1.42 -1.07 -.36 1.83 4.90 4.33 1.92 2.67 1.93 2.83 .53 -1.77 20.93
MAI 1.85 1.50 1.10 .66 .32 .43 .73 .57 .59 .21 .76 2.18
PD = -1.294 .925 PREC
RS0=.9627


ALABAMA GULF DIVISION LAT 30 40 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 52. 55. 60. 67. 71. 80. 81. 81. 77. 68. 58. 53. 67.
MEAN R.H. 80. 78. 73. 73. 74. 77. 80. 79. 79. 75. 73. 79. 77.
MEAN PREC 4.65 4.40 6.51 5.88 4.65 6.14 8.71 6.21 6.26 2.80 3.49 5.07 64.77
PREC DEP 2.97 2.86 3.89 3.23 2.74 4.00 6.18 4.42 3.66 .91 1.54 3.36
POT ET 1.67 2.15 3.85 5.29 6.92 7.27 6.92 6.32 4.73 3.55 2.27 1.60 52.53
ETOF -1.30 -.71 -.04 2.06 4.18 3.27 .74 1.90 1.07 2.64 .73 -1.76 16.58
MAT 1.78 1.33 1.01 .61 .40 .55 .89 .70 .77 .26 .68 2.09
PO = -1.194 .835 PREC
RSQ=.9442


LITTLE ROCK ARKAMSAS LAT 34 44 37 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 42. 46. 52. 63. 71. 79. 82. 82. 74. 64. 51. 44. 63.
MEAN R.H. 73. 72. 70. 68. 72. 72. 70. 70. 68. 69. 69. 72. 70.
MEAN PREC 4.75 4.31 4.78 4.99 5.01 3.35 3.39 3.04 3.38 2.66 3.94 4.04 47.64
PREC DEP 2.04 2.50 2.91 3.06 2.84 1.17 2.08 1.35 1.62 .88 2.06 2.61
POT ET 1.33 1.82 3.31 5.34 7.00 8.17 8.81 7.66 5.40 3.40 1.85 1.29 55.39
ETDF -.71 -.68 .40 2.28 4.16 7.00 6.73 6.31 3.78 2.52 -.21 -1.32 33.15
MAI 1.53 1.38 .88 .57 .41 .14 .24 .18 .30 .26 1.11 2.02
PO = -1.067 .796 PREC
RSO=.7963








8






TABLE 1 PRECIPITATION AND MOISTURE AVAILABILITY FOR THE SOUTHEAST


ARKANSAS CENTRAL DIVISION LAT 34 40 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUN OR AV.

MEAN TEMP 42. 45. 52. 62. 69. 77. 80. 80. 74. 64. 51. 44. 62.
MEAN R.H. 73. 72. 70. 68. 72. 72. 70. 70. 68. 69. 69. 72. 70.
MEAN PREC 4.87 4.36 4.94 5.43 5.71 4.21 3.76 3.15 3.32 3.25 4.37 4.38 51.75
PREC DEP 2.48 2.40 3.16 3.59 3.77 2.30 2.24 1.75 1.84 1.74 2.21 2.76
POT ET 1.34 1.78 3.31 5.25 6.79 7.95 8.58 7.46 5.41 3.41 1.86 1.29 54.44
ETOF -1.14 -.62 .15 1.66 3.02 5.65 6.34 5.71 3.57 1.67 -.35 -1.47 27.78
MAI 1.85 1.35 .95 .68 .55 .29 .26 .23 .34 .51 1.19 2.13
PD = -.780 + .765 PREC
RSB=.8878


ARKANSAS NORTHWEST DIVISION LAT 36 10 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP- OCT NOV DEC SUM OR AV.

MEAN TEMP 38. 42. 48. 60. 67. 75. 79. 79. 72. 62. 48. 41. 59.
MEAN R.H. 74. 70. 66. 66. 72. 72. 67. 68. 67. 66. 70. 72. 69.
MEAN PREC 2.57 3.13 3.53 4.59 6.08 5.14 3.59 3.31 4.08 3.57 3.25 2.57 45.41
PREC DEP 1.10 1.66 1.98 3.14 3.62 2.74 1.94 1.77 1.76 1.86 1.64 1.39
POT ET 1.10 1.63 3.14 5.15 6.56 7.74 8.87 7.52 5.20 3.30 1.60 1.11 52.90
ETDF .00 -.03 1.16 2.01 2.94 5.00 6.93 5.75 3.44 1.44 -.04 -.28 28.65
MAT 1.00 1.02 .63 .61 .55 .35 .22 .24 .34 .56 1.02 1.25
PD = -.490 .671 PREC
RSQ=.8916


ARKANSAS NORTH CENTRAL DIVISION LAT 36 0 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 38. 42. 49. 59. 67. 75. 79. 78. 72. 61. 48. 40. 59.
MEAN R.H. 75. 72. 67. 67. 70. 70. 68. 71. 66. 67. 70. 72. 70.
MEAN PREC 3.43 3.55 4.00 4.50 5.37 4.27 3.45 3.14 3.08 3.17 3.70 3.24 44.90
PREC DEP 1.48 1.94 2.17 3.06 3.44 2.20 2.26 1.78 1.47 1.66 1.90 1.78
POT ET 1.09 1.58 3.17 5.00 6.80 8.02 8.74 7.08 5.30 3.22 1.62 1.09 52.72
ETDF -.39 -.36 1.00 1.94 3.36 5.82 6.48 5.30 3.83 1.56 -.28 -.69 29.29
NAI 1.36 1.23 .68 .61 .51 .27 .26 .25 28 .52 1.17 1.63
PD = -.935 .810 PREC
RSQ=.8473
----------------------~------------------

ARKANSAS NORTHEAST DIVISION LAT 35 50 30 TEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 40. 43. 52. 61. 70. 78. 81. 80. 74. 63. 51. 42. 61.
MEAN R.H. 75. 74. 67. 66. 70. 71. 7. 73. 70. 69. 69. 74. 70.
MEAN PREC 4.88 4.22 4.84 4.46 4.71 3.75 3.73 3.23 2.96 3.20 4.15 4.08 48.21
PRECDEP 2.43 2.42 3.08 2.98 2.98 2.04 2.50 1.92 1.68 1.78 2.18 2.70
POT ET 1.16 1.57 3.39 5.27 7.13 8.23 9.13 7.04 5.14 3.24 1.76 1.12 54.17
ETDF -1.27 -.85 .31 2.29 4.15 6.19 6.63 5.12 3.46 1.46 -.42 -1.58 29.60
MAI 2.10 1.54 .91 .57 .42 .25 .27 .27 .33 .55 1.24 2.41
PD = -.121 .625 PREC
RSG=.7246


ARKANSAS WEST CENTRAL DIVISION LAT 35 10 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 42. 46. 51. 62. 70. 78. 82. 81. 74. 63. 50. 43. 62.
MEAN R.H. 73. 70. 64. 67. 73. 71. 66. 67. 65. 67. 69. 70. 68.
MEAN PREC 3.85 4.08 4.44 5.10 5.99 4.57 3.82 3.47 3.63 3.55 3.83 3.68 50.01
PREC DEP 1.66 2.12 2.62 3.57 4.24' 2.34 2.34 2.04 1.87 1.90 2.05 2.16
POT ET 1.31 1.86 3.53 5.32 6.79 8.24 9.40 7.93 5.63 3.42 1.78 1.28 56.49
ETOF -.35 -.26 .91 1.75 2.55 5.90 7.06 5.89 3.76 1.52 -.27 -.88 29.34
MAT 1.27 1.14 .74 .67 .62 .28 .25 .26 .33 .56 1.15 1.69
PD = -1.539 .947 PREC
RSO=.8817














TABLE 1 PRECIPITATION AND MOISTURE AVAILABILITY FOR THF SOUTHEAST


ARKANSAS EAST CENTRAL DIVISION


LAT 34 50


30 YEARS


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR I .

MEAN TEMP 42. 44. 53. 62. 70. 78. 81. 81. 74. 63. 51. 44. 62.
MEAN R.H. 75. 74. 67. 67. 70. 72. 70. 67. 72. 67. 68. 74. 70.
MEAN PREC 5.61 4.67 5.20 4.89 4.64 3.56 3.91 2.79 3.05 3.08 4.33 4.62 50.35
PREC DEP 3.02 2.72 3.64 3.30 2.90 2.06 2.32 1.50 1.84 1.56 2.46 ?.90
POT ET 1.28 1.67 3.53 5.33 7.14 8.07 8.70 7.93 5.05 3.45 1.87 1.24 55.27
ETDF -1.74 -1.05 -.11 2.03 4.24 6.01 6.38 6.43 3.21 1.89 -.59 -1.66 30.19
MAI 2.36 1.63 1.03 .62 .41' .26 .27 .19 .36 .45 1.31 2.34
PD = -.434 .704 PREC
RS=.8825


ARKANSAS SOUTHWEST DIVISION


LAT 33 40


30 YEARS


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 45. 48. 55. 64. 71. 79. 82. 81. 75. 65. 53. 46. 64.
MEAN R.H. 73. 72. 65. 69. 74. 72. 68. 67. 65. 67. 66. 70. 69.
MEAN PREC 4.60 4.20 4.70 5.50 5.65 3.91 3.95 3.06 3.49 3.36 4.27 4.36 51.05
PREC DEP 2.27 2.45 3.08 3.57 3.68 1.84 2.46 1.50 1.82 1.65 2.16 2.47
POT ET 1.49 1.95 3.85 5.36 6.72 8.11 9.04 7.93 5.79 3.65 2.10 1.47 57.45
ETDF -.78 -.50 .77 1.79 3.04 6.27 6.58 6.43 3.97 2.00 -.06 -1.00 30.84
MAI 1.52 1.25 .80 .67 .55 .23 .27 .19 .31 .45 1.03 1.68
PO = -1.229 + .856 PREC
RSQ=.9006


ARKANSAS SOUTH CENTRAL DIVISION


LAT 33 30


35 YEARS


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.


MEAN TEMP 44. 48. 55. 64. 71. 79. 82. 81. 76. 64. 52. 45.
MEAN R.H. 75. 73. 67. 69. 74. 75. 71. 70. 69. 69. 67. 72.
MEAN PREC 5.25 4.62, 5.12 5.42 4.87 3.55 4.12 2.86 2.99 3.09 4.77 4.97
PREC DEP 3.07 2.86 3.80 3.54 3.33 1.88 2.40 1.46 1.66 1.24 2.63 3.08
POT ET 1.41 1.93 3.74 5.36 6.71 7.65 8.59 7.56 5.53 3.50 2.04 1.40
ETDF -1.66 -.93 -.06 1.82 3.38 5.77 6.19 6.10 3.87 2.26 -.59 -1.68
MAI 2.17 1.48 1.02 .66 .50 .25 .28 .19 .30 .35 1.29 2.21
PO = -1.124 .861 PREC
RSQ=.9095


ARKANSAS SOUTHEAST DIVISION


LAT 33 40


63.
71.
51.63

55.43
29.40


30 YEARS


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.


MEAN TEMP 45. 48. 55. 64. 72. 80. 82. 82. 76. 65. 53. 46.
MEAN R.H. 76. 74. 68. 69. 73. 75. 72. 73. 70. 71. 68. 73.
MEAN PREC 5.73 4.82 5.51 5.06 4.55 3.34 4.40 2.83 3.06 2.83 4.42 5.21
PREC DEP 3.37 3.18 4.16 3.32 2.80 1.58 2.58 1.60 1.62 1.18 2.52 3.16
POT ET 1.41 1.88 3.68 5.36 6.94 7.76 8.45 7.26 5.43 3.42 2.03 1.39
ETOF -1.96 -1.30 -.48 2.04 4.14 6.18 5.87 5.66 3.81 2.24 -.49 -1.77
MAI 2.39 1.69 1.13 .62 .Q0 .20 .31 .22 .30 .34 1.24 2.27
PD = -1.040 + .841 PREC
RSG=.9215


LAKELAND FLORIDA


LAT 28 2


64.
72.
51.76

55.04
29.96


37 YEARS


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 62. 63. 66. 72. 77. 81. 82. 82. 80. 74. 67. 62. 72.
MEAN R.H. 78. 75. 73. 72. 72. 75. 78. 79. 80. 79. 78. 79. 76.
MEAN PREC 2.17 2.68 3.95 3.09 3.40 7.05 7.82 7.30 6.22 2.59 1.56 1.89 49.72
PREC DEP .88 1.04 2.16 .94 1.74 4.91 5.65 5.40 3.98 1.06 .34 .72
POT ET 2.29 2.81 4.38 5.84 7.38 7.51 7.21 6.38 4.91 3.73 2.58 2.08 57.11
ETOF 1.41 1.77 2.22 4.90 5.64 2.60 1.56 .98 .93 2.67 2.24 1.36 28.29
MAI .38 .37 .49 .16 .24 .65 .78 .85 .81 .28 .13 .35
PD = -1.179 + .864 PREC
R50=.9869


'----'--'----------'-""-~'''-"------- ---









10





TABLE 1 PRECIPITATION AND MOISTURE AVAILABILITY FOR THE SOUTHEAST


FLORIDA SOUTH CENTRAL DIVISION LAT 27 40 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUN OR AV.

MEAN TEMP 63. 64. 68. 73. 77. 80. 82. 82. 81. 76. 67. 64. 73.
MEAN R.H. 78. 75. 73. 72. 72. 75. 78. 79. 80. 79. 78. 79. 76.
MEAN PREC 2.09 2.64 3.59 3.38 3.54 7.27 8.14 7.63 7.79 4.14 1.77 1.86 53.84
PREC DEP .94 1.20 1.84 1.86 2.22 5.11 6.66 6.02 5.95 2.42 .77 .86
POT ET 2.36 2.88 4.54 5.93 7.37 7.39 7.20 6.37 4.98 3.86 2.60 2.18 57.66
ETDF 1.42 1.68 2.70 4.07 5.15 2.28 .54 .35 -.97 1.44 1.83 1.32 22.78
HAI .40 .42 .41 .31 .30 .69 .93 .94 1.19 .63 .30 .39
PD = -1.059 + .902 PREC
RSGQ=9880


FLORIDA NORTHWEST DIVISION LAT 30 30 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 53. 55. 61. 67. 75. 80. 81. 81. 78. 69. 59. 53. 68.
MEAN R.H. 79. 75. 72. 70. 70. 75. 80. 79. 80. 77. 75. 80. 76.
MEAN PREC 3.79 4.12 5.54 4.92 4.16 5.31 7.96 7.09 6.15 2.60 2.92 3.85 58.41
PREC DEP 2.26 2.57 3.42 2.96 2.74 3.48 6.22 5.08 3.78 1.03 1.19 2.21
POT ET 1.75 2.30 3.99 5.58 7.53 7.57 6.91 6.31 4.69 3.47 2.23 1.58 53.91
ETDF -.51 -.27 .57 2.62 4.79 4.09 .69 1.23 .91 2.44 1.04. -.63 18.38
MAT 1.29 1.12 .86 .53 .36 .46 .90 .80 .81 .30 .53 1.40
PD = -1.316 4 .90T PREC
RS0=.9757
---------- ---------~--- --------------------

FLORIDA NORTH DIVISION LAT 30 0 30 TEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR 1.

MEAN TEMP 56. 58. 63. 69. 73. 80. 81. 81. 79. 70. 62. 56. 69.
MEAN R.H. 78. 75. 73. 70. 70. 74. 78. 79. 79. 78. 77. 79. 7E.
MEAN PREC 2.53 3.24 4.02 3.44 3.35 6.13 7.62 6.90 6.55 4.40 1.95 2.52 52.65
PREC DEP 1.32 1.97 1.96 2.02 2.08 4.44 6.22 5.42 4.52 2.07 .90 1.02
POT ET 1.93 2.46 4.08 5.76 7.30 7.69 7.22 6.31 4.89 3.48 2.29 1.74 55.15
ETDF .561 .49 2.12 3.74 5.22 3.25 1.00 .89 .37 1.41 1.39 .72 21.21
MAI .68 .80 .48 .35 .28 .58 .86 .86 .92 .60 .39 .59
PD = -1.223 + .927 T PREC
RSQ=.9600

FLORIDA NORTH CENTRAL DIVISION LAT 28 50 30 YEARS

JAN FEB MAR APR NAY JUN JUL AUG SEP OCT NOV DEC SUN OR AV.

MEAN TEMP 60. 62. 66. 71. 76. 80. 81. 81. 80. 73. 65. 60. 71.
MEAN R.H. 78. 75. 73. 72. 72. 75. 78. 78. 79. 79. 78. 79. 76.
MEAN PREC 2.10 2.72 3.92 3.39 3.40 7.07 8.16 7.12 7.21 4.27 1.85 2.03 53.24
PREC DEP 1.04 1.26 1.94 2.06 2.18 5.10 6.49 5.57 5.18 2.44 .75 .93
POT ET 2.16 2.71 4.34 5.75 7.31 7.46 7.16 6.45 5.00 3.63 2.44 1.95 56.37
ETDF 1.12 1.45 2.40 3.69 5.13 2.35 .67 .88 -.18 1.19 1.69 1.02 21.61
NAI .48 .46 .45 .36 .30 .68 .91 .86 1.04 .67 .31 .48
PD = -1.019 + .886 PREC
RS8=.9847
--------------------------------------------

FLORIDA EVERGLADES AND SW COAST DIVISION LAT 26 10 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 66. 68. 70. 74. 78. 81. 82. 83. 82. 78. 72. 68. 75.
MEAN R.H. 78. 75. 73. 72. 72. 75. 78. 80. 81. 80. 79. 79. 77.
MEAN PREC 1.63 1.91 2.65 2.98 4.32 8.29 8.18 7.47 8.47 4.39 1.53 1.42 53.24
PREC DEP .64 .84 1.06 1.68 2.85 5.96 6.76 6.22 6.46 2.42 .72 .58
POT ET 2.59 3.17 4.76 6.03 7.41 7.39 7.12 6.28 4.97 3.98 2.86 2.44 58.99
ETOF 1.95 2.33 3.70 4.35 4.56 1.43 .36 .06 -1.49 1.56 2.14 1.86 24.29
MAI .25 .27 .22 .2s .38 .81 .95 .99 1.30 .61 .25 .24
PD = -.896 .882 PREC
RSQ0.9822








11





TABLE 1 PRECIPITATION AND MOISTURE AVAILABIIrTY FOR THE SOUTHEAST


FLORIDA LOWER EAST COAST DIVISION LAT 26 10 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 68. 68. 70. 74. 77. 80. 82. 82. 81. 78. 72. 69. 75.
MEAN R.H. 78. 75. 73. 72. 72. 75. 78. 80. 81. 80. 79. 79. 77.
MEAN PREC 2.16 2.02 2.82 3.90 5.49 7.43 6.65 6.82 9.47 8.15 2.84 2.17 59.92
PREC DEP 1.02 1.00 1.41 2.00 3.12 4.35 4.59 4.82 6.61 5.66 1.42 1.03
POT ET 2.67 3.17 4.76 6.03 7.31 7.29 7.12 6.20 4.91 3.98 2.86 2.48 58.78
ETDF 1.65 2.17 3.35 4.03 4.19 2.94 2.53 1.38 -1.70 -1.68 1.44 1.45 25.13
MAT .38 .32 .30 .33 .43 .60 .64 .78 1.35 1.42 .50 .42
PD = -.703 + .759 PREC
R50=.9824
------- ----------------------------------------------------------

FLORIDA KEYS DIVISION LAT 24 40 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR .

MEAN TEMP 70. 71. 73. 76. 80. 82. 84. 84. 83. 79. 74. 71. 77.
MEAN R.H. 80. 77. 73. 73. 73. 76. 78. 80. 82. 81. 80. 80. 78.
MEAN PREC 1.71 1.88 1.92 2.29 3.10 4.33 4.54 4.68 7.05 6.73 2.43 1.88 42.54
PREC DEP .70 .52 .78 .96 1.38 2.32 2.94 3.21 4.75 4.02 .99 .80
POT ET 2.75 3.28 5.05 6.09 7.40 7.24 7.21 6.34 4.95 4.03 2.99 2.62 59.95
ETDF 2.05 2.76 4.27 5.13 6.02 4.92 4.27 3.13 .20 .01 2.00 1.82 36.57
MAI .25 .16 .15 .16 .19 .32 .41 .51 .96 1.00 .33 .31
PD = -.734 + .756 PREC
RSG=.9770
-----------------------------"--------------

ATLANTA GEORGIA LAT 33 39 37 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR .

MEAN TEMP 44. 47. 53. 62. T1. 78. 79. 79. 73. 64. 52. 44. 62.
NEAN R.H. 71. 69. 66. 62. 70. 67. 75. 77. 75. 70. 70. 73. 70.
NEAN PREC 4.48 4.72 5.52 4.59 3.21 4.04 4.83 3.61 3.15 2.51 3.16 4.52 48.34
PREC DEP 2.88 3.04 4.08 2.94 1.72 2.36 3.04 1.98 1.81 .61 1.42 2.62
POT ET 1.51 2.01 3.65 5.61 7.21 8.68 7.68 6.45 4.76 3.43 1.93 1.33 54.27
ETDF -1.37 -1.03 -.43 2.67 5.49 6.32 4.64 4.47 2.95 2.82 .51 -1.29 29.88
NAI 1.90 1.51 1.12 .52 .24 .27 .40 .31 .38 .18 .741 1.97
PD = -1.711 + 1.014 PREC
RSQ=.9657
----------------- ---------------

GEORGIA NORTH CENTRAL DIVISION LAT 34 20 35 YEARS

JAN FEB MAR APR MAY JUN JUL AU SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 43. 44. 50. 60. 68. 75. 7. 77. 72. 2 2. 50. 43. 60.
MEAN R.H. 71. 69. 66. 62. 70. 67. 75. 77. 75. 70. 70. 73. 70.
MEAN PREC 5.08 5.01. 5.89 4.96 3.57 4.09 5.18 3.94 3.30 3.00 3.35 4.96 52.33
PREC DEP 3.37 3.28 4.44 3.25 2.30 2.85 3.62 2.59 1.96 .9 1.78 2.93
POT ET 1.44 1.85 3.40 5.41 6.92 8.38 7.51 6.28 4.66 3.27 1.81 1.26 52.19
ETDF -1.93 -1.43 -1.04 2.16 4.62 5.53 3.89 3.69 2.70 2.33 .03 -1.67 24.95
NAI 2.34 1.78 1.30 .60 .33 .34 .48 .41 .42 .29 .98 2.32
PD = -1.416 + .961 PREC
RSO=.9155
----------------------------------------------

GEORGIA NORTHWEST DIVISION LAT 34 30 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR A .

MEAN TEMP 43. 46. 53. 61. 70. 77. 80. 79. 74. 63. 51. 44. 62.
MEAN R.H. 72. 69. 66. 63. 70. 69. 73. 76. 73. 70. 70. 73. 70.
MEAN PREC 5.24 4.49 6.04 4.82 3.60 3.99 4.74 4.04 3.27 2.81 3.51 5.03 51.58
PREC DEP 3.50 2.20 4.56 3.30 2.37 2.84 3.12 2.72 1.67 1.20 1.86 2.87
POT ET 1.41 1.92 3.60 5.50 7.13 8.36 8.13 6.59 4.97 3.31 1.84 1.28 54.05
ETDF -2.09 -.28 -.96 2.20 4.76 5.52 5.01 3.87 3.30 2.11 -.02 -1.59 26.78
MAI 2.49 1.14 1.27 .60 .33 .34 .38 .41 .34 .36 1.01 2.24
PD -1.231 .911 PREC
RSQ=.8705
------------------"~" --"~--------------------















TABLE 1 PRECIPITATION AND MOISTURE AVAILABILITY FOR THE SOUTHEAST


GEORGIA NORTHEAST DIVISION LAT 34 20 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 44. 45. 52. 61. 69. 76. 78. 77. 72. 62. 51. 44. 61.
MEAN R.H. 70. 67. 66. 60. 70. 67. 76. 77. 74. 70. 70. 71. 70.
MEAN PREC 5.24 4.70 6.03 4.96 3.59 4.35 5.38 4.68 3.70 3.2Z 3.62 5.11 54.61
PREC DEP 3.46 1.64 4.48 3.26 2.34 3.15 3.75 3.06 2.03 1.26 1.98 2.98
POT ET 1.50 1.95 3.54 5.51 7.02 8.50 7.46 6.28 4.75 3.27 1.85 1.34 52.97
ETDF -1.96 .31 -.94 2.25 4.65 5.35 3.71 3.22 2.72 2.01 -.13 -1.64 24.25
MAI 2.31 .84 1.26 .59 .33 .37 .50 .49 .43 .39 1.07 2.23
PO = -1.519 + .945 PREC
RSB=.7409


GEORGIA WEST CENTRAL DIVISION LAT 33 0 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 4.6. 48. 55. 63. 71. 78. 80. 79. 75. 65. 54. 47. 63.
MEAN R.H. 75. 68. 67. 65. 70. 69. 77. 77. 75. 72. 70. 76. 72.
MEAN PREC 4.58 4.65 5.99 4.90 3.34 4.11 5.60 4.16 3.34 2.29 2.92 4.63 50.51
PREC DEP 2.97 3.12 4.49 3.22 1.96 3.12 4.32 3.11 2.06 .68 1.44 2.72
POT ET 1.51 2.13 3.77 5.62 7.19 8.37 7.44 6.45 4.92 3.41 2.05 1.38 54.24
ETOF -1.46 -.99 -.72 2.40 5.23 5.25 3.12 3.34 2.86 2.73 .61 -1.34 25.55
MAI 1.97 1.47 1.19 .57 .27 .37 .58 .48 .42 .20 .70 1.97
PD = -1.368 + .982 PREC
RSQ=.9431


GEORGIA CENTRAL DIVISION LAT 32 50 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 46. 49. 55. 64. 72. 79. 81. 80. 76. 64. 54. 47. 64.
MEAN R.H. 75. 68. 67. 65. 70. 67. 77. 77. 77. 73. 70. 76. 72.
MEAN PREC 4.15 4.51 5.18 4.30 3.49 3.88 5.33 4.10 3.36 2.34 2.48 4.11 47.23
PREC DEP 2.54 2.82 3.62 2.74 2.08 2.89 4.30 3.03 2.11 .84 1.14 2.42
POT ET 1.52 2.18 3.78 5.71 7.29 8.74 7.52 6.53 4.79 3.31 2.07 1.39 54.85
ETDF -1.02 -.64 .16 2.97 5.21 5.85 3.22 3.50 2.68 2.47 .93 -1.03 27.01
MAI 1.67 1.29 .96 .48 .29 .33 .57 .46 .44 .25 .55 1.74
PD = -1.399 + 1.002 PREC
RSG=.9288


GEORGIA EAST CENTRAL DIVISION LAT 33 0 35 TEARS

JAN FEB MAR APR MAY JUN JUL AUO SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 48. 49. 57. 64. 73. 79. 81. 81. 76. 65. 55. 48. 65.
MEAN R.H. 75. 69. 67. 65. 70. 67. 77. 78. 77. 75. 72. 76. 72.
MEAN PREC 3.33 4.06 4.48 3.82 3.33 3.94 4.98 4.59 3.82 2.51 2.21 3.46 44.58
PREC DEP 2.08 2.52 2.86 2.44 1.98 2.76 3.78 3.12 2.40 .75 1.00 2.02
POT ET 1.58 2.14 3.91 5.71 7.40 8.75 7.53 6.47 4.79 3.23 2.02 1.41 54.94
ETDF -.50 -.38 1.05 3.27 5.42 5.99 3.75 3.35 2.39 2.47 1.02 -.61 28.72
HAI 1.32 1.18 .73 .43 .27 .32 .50 .48 .50 .24 .49 1.43
PD = -1.466 + 1.016 PREC
RSQ=.9571
------------------ ----------------------

GEORGIA SOUTHWEST DIVISION LAT 31 20 35 TEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR V.

MEAN TEMP 51. 53. 60. 67. 75. 81. 82. 82. 78. 68. 57. 52. 67.
MEAN R.H. 77. 70. 69. 68. 70. 72. 79. 78. 78. 74. 74. 77. 74.
MEAN PREC 4.03 4.49 5.31 4.77 3.58 4.07 6.27 5.20 4.22 2.11 2.54 4.14 50.73
PREC DEP 2.46 2.83 3.40 3.08 2.20 3.39 5.22 4.04 2.64 .52 .97 2.34
POT ET 1.71 2.38 4.09 5.75 7.56 8.17 7.21 6.55 4.88 3.57 2.14 1.60 55.61
ETOF -.75 -.45 .69 2.67 5.36 4.78 1.99 2.51 2.24 3.05 1.17 -.74 24.46
MAI 1.44 1.19 .83 .54 .29 .42 .72 .62 .54 .15 .45 1.46
PD = -1.705 + 1.056 PREC
RSO=.9257








13





TABLE 1 PRECIPITATION AND MOISTURE AVAILABILITY FOR THE SOUTHEAST


GEORGIA SOUTH CENTRAL DIVISION LAT 31 20 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 51. 53. 59. 66. 74. 80. 81. 81. 77. 68. 58. 52. 67.
MEAN R.H. 77. 71. 70. 67. 70. 73. 78. 78. 78. 75. 75. 78. 74.
MEAN PREC 3.44 4.07 4.71 4.18 3.40 4.71 6.20 5.41 4.13 2.27 1.99 3.38 47.88
PREC DEP 2.12 2.40 2.83 2.59 2.17 3.42 4.79 4.20 2.64 .56 .82 1.80
POT ET 1.71 2.34 3.95 5.75 7.45 7.92 7.29 6.47 4.82 3.50 2.14 1.57 54.90
ETDF -.41 -.06 1.12 3.16 5.28 4.50 2.50 2.27 2.18 2.94 1.32 -.23 25.26
HAI 1.24 1.03 .72 .45 .29 .43 .66 .65 .55 .16 .38 1.15
PDO -1.444 + .995 PREC
RSQ=.9653
--------------------------~-------------------

GEORGIA SOUTHEAST DIVISION LAT 31 30 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 51. 53. 58. 66. 73. 79. 80. 80. 76. 67. 57. 51. 66.
MEAN R.H. 77. 72. 71. 69. 70. 74. 79. 79. 78. 77. 77. 79. 75.
MEAN PREC 2.71 3.36 3.95 3.26 3.28 5.36 6.93 6.25 6.24 3.09 1.79 2.76 48.98
PREC DEP 1.50 1.94 ?.08 2.04 1.95 3.79 5.32 4.77 3.88 1.06 .92 1.36
POT ET 1.70 2.29 3.81 5.57 7.35 7.68 7.04 6.24 4.74 3.30 2.00 1.49 53.21
ETDF .20 .35 1.73 3.53 5.40 3.89 1.72 1.47 .86 2.24 1.08 .13 22.60
MAI .88 .85 .55 .37 .27 .49 .76 .76 .82 .32 .46 .91
PD = -.996 + .869 PREC
RSQ=.9495
------------------------------------

LEXINGTON KENTUCKY LAT 38 2 37 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 34. 36. 44. 55. 64. 73. 76. 75. 69. 58. 44. 36. 55.
MEAN R.H. 72. 71. 69. 62. 70. 70. 75. 76. 72. 72. 72. 72. 71.
MEAN PREC 4.48 3.53 4.82 3.88 3.91 4.41 5.01 3.37 2.70 2.18 3.17 3.55 45.01
PREC DEP 2.38 2.19 3.07 2.63 2.32 2.92 3.24 2.31 1.58 1.26 2.02 2.16
POT ET .91 1.25 2.59 4.69 6.34 7.68 7.29 5.99 4.36 2.59 1.28 .86 45.83
ETDF -1.47 -.94 -.48 2.06 4.02 4.76 4.05 3.68 2.78 1.33 -.74 -1.30 22.68
MAI 2.61 1.75 1.19 .56 .37 .38 .44 .39 .36 .49 1.58 2.51
PD = -.098 + .650 PREC
RSQ=.9075
-------------- ------,----------------

KENTUCKY BLUE GRASS DIVISION LAT 38 10 35 YEARS

JAN FEB MAR APR MAY JUN 'JUL AUG SEP OCT NOV DEC SU OR AV.

MEAN TEMP 36. 37. 46. 55. 65 74. 77. 76. 70. 58. 46. 37. 56.
MEAN R.H. 72. 71. 69. 62. 70. 70. 75. 76. 72. 72. 72. 72. 71.
MEAN PREC 4.37 3.56 4.97 3.87 3.90 4.33 4.70 3.53 2.99 2.24 3.17 3.26 44.89
PREC DEP 2.48 2.10 3.33 2.82 2.58 3.00 3.64 2.57 1.93 1.30 2.04 2.03
POT ET .96 1.28 2.69 4.68 6.43 7.78 7.38 6.06 4.41 2.58 1.33 .88 46.45
ETOF -1.52 -.82 -.64 1.86 3.85 4.78 3.74 3.49 2.48 1.28 -.71 -1.15 21.47
NAI 2.59 1.64 1.24 .60 .40 .39 .49 .42 .44 .50 1.54 2.31
PD = -.447 + .784 PREC
SRSg=.8699


KENTUCKY WESTERN DIVISION LAT 37 10 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 37. 40. 47. 58. 67. 75. 79. 78. 71. 60. 47. 39. 58.
MEAN R.H. 72. 71. 68. 62. 70. 70. 73. 75. 72. 72. 72. 72. 71.
MEAN PREC 4.69 3.92 5.44 4.09 4.13 3.86 3.97 3.37 3.25 2.46 3.69 3.69 46.56
PREC DEP 2.35 2.20 3.46 3.08 2.68 2.32 2.84 2.30 1.85 1.34 2.24 2.38
POT ET 1.05 1.45 2.89 5.04 6.71 7.95 7.95 6.46 4.60 2.78 1.43 .99 49.31
ETDF -1.30 -.75 -.57 1.96 4.03 5.63 5.11 4.16 2.75 1.44 -.P1 -1.39 25.08
MAI 2.24 1.51 1.20 .61 .40 .29 .36 .36 .40 .48 1.56 2.40
PD = -.055 .638 PREC
RS0=.7196
---------------------------------------------------------, ,,, _,,,_















TABLE 1 PRECIPITATION AND MOISTURE AVAILABILITY FOR THE SOUTHEAST


KENTUCKY CENTRAL DIVISION LAT 37 20 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 36. 37. 46. 56. S6. 73. 77. 76. 70. 58. 46. 37. 56.
MEAN R.H. 71. 71. 69. 62. 70. 70. 75. 76. 72. 72. 72. 72. 71.
MEAN PREC 4.82 3.91 5.31 3.95 3.98 4.28 4.28 3.43 3.10 2.41 3.51 3.77 46.75
PREC DEP 2.53 2.16 3.55 2.96 2.50 2.71 3.10 2.42 2.40 1.38 2.25 2.37
POT ET 1.03 1.33 2.77 4.84 6.49 7.72 7.43 6.14 4.51 2.67 1.39 .93 47.26
ETDF -1.50 -.83 -.78 1.88 3.99 5.01 4.33 3.72 2.11 1.29 -.86 -1.44 22.35
AI' 2.46 1.62 1.28 .61 .39 .35 .42 .39 .53 .52 1.62 2.55
PD = .246 + .586 PREC
RSG=.6893


KENTUCKY EASTERN DIVISION LAT 37 30 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 37. 39. 46. 56. 65. 73. 76. 75. 69. 58. 46. 38. 56.
MEAN R.H. 71. 71. 70. 61. 70. 70. 73. 77. 72. 72. 72. 72. 71.
MEAN PREC 4.36 4.05 4.89 3.79 3.90 4.28 4.93 3.68 2.85 2.27 3.20 3.57 45.77
PREC DEP 2.78 2.56 3.56 2.84 2.62 3.20 3.76 2.71 2.08 1.20 2.06 2.28
POT ET 1.05 1.39 2.71 4.83 6.48 7.71 7.61 5.92 4.43 2.65 1.38 .94 47.09
ETDF -1.73 -1.17 -.85 1.99 3.86 4.51 3.85 3.21 2.35 1.45 -.68 -1.34 21.21
MAI 2.66 1.84 1.31 .59 .40 .41 .49 .46 .47 .45 1.50 2.42
PD = -.611 .852 PREC
RSG=.9174


BATON ROUGE LOUISIANA LAT 30 32 37 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 54. 56. 61. 68. 75. 81. 82. 82. 78. 69. 59. 54. 68.
MEAN R.H. 78. 77. 70. 75. 76. 75. 75. 75. 75. 72. 71. 75. 74.
MEAN PREC 4.87 4.83 4.70 5.01 4.56 4.05 6.53 5.14 3.68 2.56 3.99 5.02 54.94
PREC OEP 3.28 2.92 2.48 3.00 "2.49 2.02 4.36 3.18 1.84 .72 1.57 3.46
POT ET 1.83 2.25 4.13 5.17 6.73 7.67 7.83 6.98 5.24 3.82 2.40 1.79 55.85
ETDF -1.45 -.67 1.65 2.17 4.24 5.65 3.47 3.80 3.40 3.10 .83 -1.67 28.32
MAI 1.80 1.30 .60 .58 .37 .26 .56 .46 .35 .19 .65 1.93
PD = -1.876 .980 PREC
RS0=.9362


LOUISIANA EAST CENTRAL DIVISION LAT 30 30 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 53. 55. 61. 688. 74. 80. 81. 1. 78. 68. s5. 53. 68.
MEAN R.H. 78.' 77. 70. 75. 76. 75. 75. 75. 75. 72. 71. 75. 74.
MEAN PREC 4.87 4.94 5.91 5.26 5.17 4.94 6.67 5.31 4.28 2.80 4.11 5.67 59.93
PREC DEP 3.46 3.46 3.42 3.57 3.12 2.90 -4.98 3.97 2.38 1.04 1.91 3.87
POT ET 1.79 2.21 4.13 5.17 6.64 7.57 -7.72 6.89 5.24 3.77 2.40 1.76 55.31
ETDF -1.67 -1.25 .71 1.60 3.52 4.67 2.74 2.92 2.86 2.73 .49 -2.11 22.25
MAI 1.93 1.57 .83 .69 .47 .38 .64 .58 .45 .28 .79 2.20
PD = -1.805 + .997 PREC
RSQ=.8922


LOUISIANA NORTHWEST DIVISION LAT 32 20 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 48. 51. 56. 66. 74. 81. 84. 83. 77. 67. 56. 49. 66.
MEAN R.H. 75. 73. 67. 76. 75. 74. 70. 69. 68. 68. 67. 70. 71.
MEAN PREC 5.19 4.42 4.45 4.97 5.02 3.18 3.96 2.99 2.63 2.78 4.60 5.13 49.32
PREC OEP 3.20 2.94 3.14 3.26 3.02 1.18 2.14 1.58 1.30 1.02 2.42 2.96
POT ET 1.62 2.2 3.87 4.89 6.83 7.93 8.90 7.88 5.76 3.82 2.29 1.66 57.57
ETOF -1.58 -.82 .73 1.63 3.81 6.75 6.76 6.30 4.46 2.80 -.13 -1.30 33.25
MAI 1.98 1.39 .81 .67 .44 .15 .24 .20 .23 .27 1.06 1.79
PO = -1.125 .845 PREC
RS5=.8957










15



TABLE 1 PRECIPITATION AND MOISTURE AVAILABILITY FOR THE SOUTHEAST


LOUISIANA NORTH CENTRAL DIVISION LAT 32 20 30 YrARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OP AV.

MEAN TEMP 48. 50. 58. 65. 72. 80. 82. 82. 77. 67. 56. 48. 65.
MEAN R.H. 75. 74. 68. 70. 75. 75. 73. 70. 70. 70. 68. 72. 72.
MEAN PREC 5.80 4.91 4.91 5.15 5.18 3.98 5.02 3.21 2.93 2.82 4.47 5.48 53.86
PREC DEP 3.75 3.36 3.74 3.42 3.29 1.92 3.00 1.94 1.37 .14 2.36 3.36
POT ET 1.62 2.03 3.96 5.38 6.64 7.68 8.23 7.65 5.59 3.70 2.25 1.57 56.29
ETDF -2.13 -1.33 .22 1.96 3.35 5.76 5.23 5.71 4.21 2.76 -.11 -1.79 29.20
MAI 2.32 1.65 .95 .64 .50 .25 .36 .25 .25 .25 1.05 2.15
PD = -1.315 + .896 PREC
RSG=.8952


LOUISIANA NORTHEAST DIVISION LAT 32 30 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 49. 51. 58. 65. 72. 79. 81. 81. 76. 65. 55. 49. 65.
MEAN R.H. 76. 75. 68. 70. 75. 76. 74. 73. 73. 71. 69. 74. 73.
MEAN PREC 5.60 5.28 5.51 4.97 4.61 3.77 4.59 3.15 2.61 2.37 4.67 5.37 52.50
PREC DEP 3.42 3.44 4.34 3.05 2.82 2.04 2.66 1.84 1.18 .76 2.09 3.53
POT ET 1.61 2.03 3.95 5.38 6.65 7.44 7.98 7.17 5.21 3.51 2.16 1.53 54.62
ETDF -1.81 -1.41 -.39 2.33 3.83 5.40 5.32 5.33 4.03 2.75 .08 -2.00 29.07
MAI 2.13 1.70 1.10 .57 .42 .27 .33 .26 .23 .22 .96 2.31
PO = -1.211 + .870 PREC
RSQ=.8863


LOUISIANA NEST CENTRAL DIVISION LAT 31 30 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 51. 54. 59. 66. 73. 79. 81. 82. 77. 67. 57. 52. 66.
MEAN R.H. 76. 76. 70. 75. 77. 75. 77. 73. 73. 70. 72. 75. 74.
MEAN PREC 5.42 4.77 4.57 5.13 5.57 4.07 4.60 3.57 3.19 2.89 4.70 5.34 53.82
PREC DEP 3.48 3.10 3.28 2.84 2.98 1.39 2.72 2.01 1.60 .86 2.26 3.44
POT ET 1.74 2.16 3.94 5.00 6.44 7.53 7.46 7.26 5.33 3.76 2.21 1.66 54.49
ETOF -1.74 -.94 .66 2.16 3.46 6.14 4.74 5.25 3.73 2.90 -.05 -1.78 29.S4
MAI 2.00 1.43 .83 .57 .46 .18 :.36 .28 .30 .23 1.02 2.07
PD = -1.353 + .858 PREC
RSQ=.7671
----------------------- -------.----------------

LOUISIANA CENTRAL DIVISION LAT 31 0 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 51. 54. 60. 66. 73. 79. 81. 80. 76. 67. 58. 52. 66.
MEAN R.H. 77. 77. 70. 75. 77. 77. 77. 75. 75. 72. 73. 75. 75.
MEAN PREC 5.64 4.91 5.28 5.32 5.83 4.54 5.55 4.44 3.64 2.99 4.60 5.75 58.49
PREC DEP 3.82 3.36 3.51 3.40 3.28 2.46 3.83 2.70 2.09 1.20 2.22 4.15
POT ET 1.73 2.14 4.04 5.01 6.42 7.19 7.43 6.80 5.08 3.67 2.24 1.69 53.47
ETDF -2.09 -1.22 .53 1.61 3.14 4.73 3.60 4.10 2.99 2.47 .02 -2.46 23.21
MAI 2.20 1.57 .87 .68 .51 .34 .52 .40 .41 .33 .99 2.45
PO = -1.509 .925 PREC
RSQ=.8736


LOUISIANA SOUTHWEST DIVISION LAT 30 10 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 53. 56. 60. 68. 75. 81. 83. 82. 78. 70. 60. 54. 68.
MEAN R.H. 79. 78. 75. 78. 78. 78. 79. 79. 79. 73. 75. 79. 77.
MEAN PREC 5.24 4.58 4.27 4.41 5.35 4.79 6.59 5.46 4.42 3.16 4.53 5.46 58.26
PREC DEP 3.43 2.97 2.43 3.30 2.78 2.17 4.49 3.34 2.53 1.22 2.50 3.89
POT ET 1.77 2.22 3.73 4.86 6.44 7.17 7.25 6.39 4.82 3.84 2.30 1.67 52.44
ETDF -1.66 -.75 1.30 1.56 3.66 5.00 2.76 3.05 2.29 2.62 -.20 -2.22 22.22
MAI 1.93 1.34 .65 .68 .43 .30 .62 .52 .53 .32 1.09 2.33
PD = -1.338 + .888 PREC
RSQ=.7772







16






TABLE 1 PRECIPITATION AND MOISTURE AVAILABILITY FOR THE SOUTHEAST


LOUISIANA SOUTH CENTRAL DIVISION LAT 30 0 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 54. 56. 62. 68. 75. 80. 82. 82. 78. 69. 60. 55. 68.
NEAN R.H. 78. 78. 75. 78. 78. 77. 79. 79. 79. 75. 75. 78. 77#
MEAN PREC 4.58 4.61 4.67 4.55 4.80 5.44 7.60 6.44 5.35 2.98 4.02 5.28 60.~2
PREC DEP 3.04 3.10 2.23 3.21 3.01 3.28 5.64 4.44 3.18 1.08 1.85 3.72
POT ET 1.86 2.23 3.86 4.86 6.43 7.23 7.15 6.39 4.82 3.65 2.31 1.75 52.54
ETOF -1.19 -.87 1.63 1.65 3.42 3.95 1.51 1.95 1.64 2.57 .46 -1.97 18.78
MAI 1.63 1.39 .58 .66 .47 .45 .79 .69 .66 .30 .80 2.12
PD = -1.692 + .963 PREC
RSQ=.9193


LOUISIANA SOUTHEAST DIVISION LAT 29 40 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 55. 58. 63. 69. 76. 81. 83. 83. 80. 72. 62. 56. 70.
iMEAN R.H. 79. 78. 75. 78. 78. 77. 79. 79. 79. 75. 75. 78. 77.
MEAN PREC 4.26 4.51 5.14 4.72 4.69 5.26 7.52 6.66 6.63 3.30 3.92 4.75 61.36
PREC DEP 2.82 2.89 2.66 3.12 2.86 3.13 5.96 '5.06 4.26 1.20 1.70 3.24
POT ET 1.87 2.33 3.94 4.94 6.51 7.30 7.22 6.47 4.96 3.84 2.41 1.81 53.61
ETDF -.95 -.56 1.28 1.82 3.65 4.17 1.26 1.41 70 2.64 .71 -1.43 17.65
MAI 1.50 1.24 .67 .63 .44 .43 .83 .78 .86 .31 .70 1.79
PD = -1.998 + 1.025 PREC
RSQ=.9227


MERIDIAN MISSISSIPPI LAT 32 20 37 YEARS

JAN FEB MAR APR MAY JUN JUL AUS SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 48. 51. 56. 64. 72. 79. 81. 81. 76. 65. 54. 48. 65.
MEAN R.H. 78. 76. 70. 74. 75. 77. 77. 77. 75. 73. 72. 77. 75.
MEAN PREC 4.77 5.30 6.23 5.19 3.94 4.14 5.84 3.51 3.00 2.15 3.45 5.64 53.17
PREC DEP 2.82 3.20 4.10 2.88 1.81 2.68 3.10 2.00 1.57 .48 1.60 3.88
POT ET 1.52 1.99 3.69 4.93 6.64 7.27 7.50 6.62 5.02 3.40 2.03 1.42 52.04
ETDF -1.30 -1.21 -.41 2.05 4.83 4.59 4.40 4.62 3.45 2.92 .43 -2.46 27.29
MAT 1.86 1.60 1.11 .58 .27 .37 .41 .30 .31 .14 .79 2.73
PD = -1.027 + .798 PREC
RSQ=.9219


MISSISSIPPI SOUTHEAST DIVISION LAT 31 50 30 YEARS

JAN FEB MAR APR MAY JUN 'JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 49. 51. 58. 66. 72. 80. 81.' 81. 77. 67. 56. 50. 66.
MEAN R.H. 78. 76. 70. 74. 75. 77. 77. 77. 75. 73. 72. 77. 75.
MEAN PREC 4.89 5.09 6.57 5.39 4.49 4.30 6.77 4.22 3.82 2.49 3.90 5.37 57.30
PREC DEP 3.44 3.67 4.50 3.66 2.67 2.92 4.78 2.99 2.16 .90 1.92 3.56
POT ET 1.58 2.02 3.86 5.10 6.63 7.34 7.48' 6.61 5.11 3.55 2.14 1.51 52.92
ETDF -1.86 -1.65 -.64 1.44 3.96 4.42 '2.70 "3.62 2.95 2.65 .22 -2.05 21.96
MAT 2.18 1.82 1.17 .72 .40 .40 .64 .45 .42 .25 .90 2.36
PD = -1.176 .895-* PREC
RSQ=.9521


MISSISSIPPI UPPER DELTA DIVISION LAT 34 10 30 TEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUN OR AV.

MEAN TEMP 44. 47. 55. 64. 72. 79. 82. 82. 76. 65. 53. 46. 64.
MEAN R.H. 75. 75. 68. 68. 72. 75. 73. 75. 72. 72. 68. 73. 72.
MEAN PREC 6.06 5.04 5.87 4.89 4.22 3.58 3.93 2.38 2.98 2.60 4.46 4.95 50.96
PREC DEP 3.44 3.16 4.24 3.27 2.48 2.16 2.20 .1.33 1.36 .94 2.50 2.94
POT ET .1.38 1.78 3.65 5.44 7.09 7.69 8.33 6.99 5.22 3.33 2.00 1.36 54.25
ETOF -2.06 -1.38 -.59 2.17 4.61 5.53 6.13 5.66 3.86 2.39 -.50 -1.58 30.34
MAI 2.50 1.77 1.16 .60 .35 .28 .26 .19 .26 .29 1.25 2.16
PD = -.814 .781 PREC
RSO=.9254














TABLE 1 PRECIPITATION AND MOISTURE AVAILABILITY FOR THE SOUTHEAST


MISSISSIPPI NORTH CENTRAL DIVISION LAT 34 20 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 44. 46. 54. 63. 70. 78. 81. 80. 75. 64. 52. 45. 63.
MEAN R.H. 76. 75. 66. 66. 68. 75. 71. 75. 72. 70. 68. 73. 71.
MEAN PREC 6.03 5.18 5.80 5.05 4.07 3.78 4.20 3.07 3.35 2.79 4.60 5.17 53.09
PREC DEP 3.50 3.24 4.13 3.47 2.70 2.01 2.56 1.90 1.81 1.39 2.70 3.10
POT ET 1.34 1.74 3.68 5.51 7.36 7.60 8.53 6.81 5.14 3.38 1.95 1.32 54.36
ETDF -2.16 -1.50 -.45 2.04 4.66 5.59 5.97 4.91 3.33 1.99 -.75 -1.78 28.50
MAI 2.61 1.87 1.12 .63 .37 .26 .30 .28 .35 .41 1.39 2.35
PD = -.571 .741 PREC
RS0=.9147


MISSISSIPPI NORTHEAST DIVISION LAT 34 30 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 42. 44. 52. 61. 69. 77. 80. 79. 74. 63. 51. 43. 61.
MEAN R.H. 76. 75. 66. 66. 68. 70. 72. 75. 70. 70. 69. 74. 71.
MEAN PREC 5.91 5.39 6.02 4.80 3.96 3.84 4.35 3.07 3.28 2.76 4.57 5.17 53.12
PREC DEP 3.60 3.35 4.34 3.54 2.64 2.24 3.02 1.78 1.44 1.26 2.50 3.22
POT ET 1.27 1.65 3.53 5.33 7.26 8.22 8.28 6.72 5.24 3.31 1.87 1.23 53.92
ETDF -2.33 -1.70 -.81 1.79 4.62 5.98 5.26 4.94 .3.80 2.05 -.63 -1.99 28.45
MAI 2.83 2.03 1.23 .66 .36 .27 .36 .26 .27 .38 1.34 2.62
PDO = -.903 .824 PREC
RSQ=.8976
-------------------------------------------------

MISSISSIPPI LOWER DELTA DIVISION LAT 33 10 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 47. 50. 56. 65. 73. 80. 82. 82. 76. 66. 54. 48. 65.
MEAN R.H. 76. 76. 69. 74. 77. 75. 76. 74. 72. 72. 72. 75. 74.
MEAN PREC 5.61 5.05 5.63 5.05 3.86 3.76 4.22 2.78 2.85 2.52 4.54 5.23 51.10
PREC DEP 3.33 3.36 4.34 3.32 2.32 2.06 2.52 1.72 1.30 1.10 2.48 3.26
POT ET 1.50 1.91 3.71 5.00 6.49 7.73 7.80 7.13 5.27 3.46 1.97 1.43 53.40
ETDF -1.83 -1.45 -.63 1.68 4.17 5.67 5.28 5.41 3.97 2.35 -.51 -1.83 28.54
MAI 2.22 1.76 1.17 .66 .36 .27 .32 .24 .25 .32 1.26 2.28
PD -.942 .830 PREC
RSQ=.9179
----------------------------------------------

MISSISSIPPI CENTRAL DIVISION LAT 33 0 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 48. 50. 57. 65. 72. 79. 81. 81. 76. 66. 55. 49. 65.
MEAN R.H. 77. 76. 68. 69. 73. 76. 75. 75. 74. 70. 70. 76. 73.
MEAN PREC 5.51 5.22 5.95 4.72 4.03 3.74 5.21 *3.25 2.81 2.31 4.14 5.17 52.06
PREC DEP 3.32 3.53 4.54 3.18 2.70 2.34 3.31 2.22 1.56 .95 2.06 3.52
POT ET 1.51 1.92 3.85 5.46 6.92 7.47 7.85 6.90 5.09 3.59 2.09 1.44 54.10
ETDF -1.81 -1.61 -.69 2.28 4.22 5.13 4.54 4.68 3.53 2.64 .03 -2.08 27.06
MAI 2.20 1.84 1.18 .58 .39 .31 .42 .32 .31 .26 .98 2.44
PD = -.821 + .828 PREC
RS5=.9172
--------------------------

MISSISSIPPI EAST CENTRAL DIVISION LAT 33 20 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 46. 48. 56. 63. 71. 78. 80. 80. 76. 65. 54. 47. 64.
MEAN R.H. 76. 75. 68. 68. 71. 75. 75. 75. 74. 72. 70. 77. 73.
MEAN PREC 5.44 5.52 5.93 4.47 3.76 3.48 5.27 3.20 3.10 2.54 3.93 4.84 51.48
PREC DEP 3.18 3.66 4.56 3.01 2.62 2.16 3.39 2.14 1.69 1.07 2.06 3.36
POT ET 1.46 1.86 3.76 5.37 7.08 7.54 7.77 6.81 5.07 3.39 2.03 1.33 53.48
ETDF -1.72 -1.80 -.80 2.36 4.46 5.38 4.38 4.67 3.38 2.32 -.03 -2.03 26.95
MAI 2.13 1.96 1.21 .56 .37 .29 .44 .31 .33 .32 1.01 2.52
PD = -.820 .830 PREC
RSQ=.9074
---------------------------------'------"------------------------















TABLE 1 PRECIPITATION AND MOISTURE AVA ILABILITY FOR THE SOUTHEAST


MISSISSIPPI SOUTHWEST DIVISION LAT 31 40 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 48. 51. 58. 65. 72. 78. 81. 80. 76. 65. 55. 49. 65.
MEAN R.H. 77. 76. 71. 75. 76. 77. 77. 77. 75. 73. 71. 76. 75.
MEAN PREC 5.44 5.21 5.94 5.15 4.77 4.17 5.14 3.70 2.99 2.32 4.21 5.59 S4.63
PREC DEP 3.56 3.59 4.28 3.15 2.94 2.56 3.42 2.54 1.69 1.00 1.91 4.12
POT ET 1.59 2.03 3.80 4.92 6.49 7.14 7.47 6.53 5.05 3.45 2.15 1.52 52.14
ETDF -1.97 -1.56 -.48 1.77 3.55 4.58 4.05 3.99 3.36 2.45 .24 -2.60 23.99
MAI 2.24 1.77 1.13 .64 .45 .36 .46 .39 .33 .29 .89 2.71
PO = -1.045 + .866 PREC
RSQ=.9177


MISSISSIPPI SOUTH CENTRAL DIVISION LAT 31 30 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 4.9. 53. 57. 65. 73. 79. 81. 80. 76. 65. 55. 50. 65.
MEAN R.H. 77. 76. 72. 76. 75. 78. 77. 77. 75. 72. 74. 77. 75.
MEAN PREC 5.15 5.17 6.24 5.44 4.81 4.57 6.12 4.26 3.88 2.62 3.71 5.58 57.55
PREC DEP 3.43 3.70 3.92 3.35 2.75 2.35 3.83 2.98 2.02 1.14 1.74 3.85
POT ET 1.63 2.12 3.68 4.83 6.71 7.06 7.46 6.53 5.06 3.52 2.05 1.53 52.18
ETDF -1.80 -1.58 -.24 1.48 3.96 4.71 3.63 3.55 3.04 2.38 .31 -2.32 23.06
nAI 2.10 1.75 1.07 .69 .41 .33 .51 .46 .40 .32 .85 2.52
PD = -1.080 .834 PREC
RSQ=.8984


MISSISSIPPI COASTAL DIVISION LAT 30 40 30 YEARS

JAN FEB MAP APR MAY JUN JUL 'AUG SEP OCT NOV DEC SUM OR N.

MEAN TEMP 53. 55. 61. 68. 75. 81. 82. 82. 79. 70. 60. 54. 68.
MEAN R.H. 79. 78. 75. 78. 76. 78. 78. 78. 78. 75. 74. 78. 77.
MEAN PREC 4.31 4.59 6.23 5.38 4.82 5.17 7.81 5.94 5.90 2.67 3.71 5.21 I1.74
PREC DEP 2.82 3.00 3.46 3.24 2.69 3.14 5.49 4.26 3.08 .74 1.55 3.51
POT ET 1.74 2.15 3.77 4.85 6.74 7.20 7.35 6.55 4.97 3.66 2.30 1.67 52.96
ETDF -1.08 -.85 .31 1.61 4.05 4.06 1.86 2.29 1.89 2.92 .75 -1.84 19.74
MAI 1.62 1.39 .92 .67 .40 .44 .75 .65 .62 .20 .67 2.10
PD = -1.347 .861 PREC
RS9=.8947
----------- ------------ --------------------

SPRINOFIELD MISSOURI LAT 37 14 37 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 33. 37. 43. 56. 65. 74. 77. 77. 70. 59. 44. 36. 56.
MEAN R.H. 72. 70. 65. 65. 71. 72. 65. 69. 64. 65. 70. 72. 68.
MEAN PREC 1.84 2.21 2.93 4.19 4.99 4.83 3.55 3.05 3.79 3.22 2.45 2.30 39.35
PREC DEP .70 1.22 1.68 2.56 3.15 2.50 -1.82 1.41 1.59 1.68 1.22 1.09
POT ET .93 1.36 2.75 4.76 6.39 7.57 8.80 7.09 5.13 3.05 1.38 .91 50.14
ETOF .23 .14 1.07 2.20 3.24 5.07 6.98 5.68 3.54 1.37 .16 -.18 29.70
MAI .75 .90 .61 .54 .49 .33 .21 .20 .31 .55 .88 1.20
PD = -.415 + .651 PREC
RSQ=.9002
------------------~--------------------------

MISSOURI WEST OZARKS DIVISION LAT 37 10 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 33. 37. 43. 56. 65. 74. 77. 77. 70. 59. 44. 36. 56.
MEAN R.H. 72. 70. 65. 65. 71. 72. 65. 69. 64. 65. 70. 72. 68.
MEAN PREC 2.15 2.39 3.05 4.14 5.41 4.95 3.56 3.19 3.91 3.65 2.82 2.27 41.49
PREC OEP .97 1.44 1.82 2.78 3.40 2.52 2.05 1.86 1.84 2.06 1.41 1.26
POT ET .93 1.36 2.76 4.77 6.39 7.58 8.81 7.10 5.14 3.06 1.39 .91 50.20
ETDF -.04 -.08 .94 1.319 2.99 5.06 6.76 5.24 3.30 1.00 -.02 -.35 27.27
MAI 1.04 1.06 .66 .!8 .53 .33 .23 .26 .36 .67 1.02 1.38
PD = -.213 G .626 PREC
RSQ=.8841















TABLE 1 PRECIPITATION AND MOISTURE AVA ILABILITY FOR THE SOUTHEAST
----- ----------------------------------. ,-----------,,

MISSOURI PRAIRIE DIVISION LAT 39 50 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 27. 30. 41. 53. 64. 73. 78. 76. 68. 57. 42. 31. 53.
MEAN R.H. 72. 70. 68. 63. 68. 71. 63. 64. 65. 68. 70. 72. 68.
MEAN PREC 1.40 1.33 2.37 3.21 4.50 5.43 3.43 4.06 3.53 2.63 1.93 1.54 35.36
PREC DEP .72 .83 1.34 2.32 3.52 3.38 2.02 2.56 1.73 1.28 .76 .90
POT ET .64 .97 2.30 4.35 6.40 7.43 8.85 7.22 4.57 2.52 1.13 .65 47.04
ETDF -.08 .14 .96 2.03 2.88 4.05 6.83 4.66 2.84 1.24 .37 -.25 26.01
MAI 1.12 .86 .58 .53 .55 .45 .23 .35 .38 .51 .67 1.38
PD = -.344 + .721 PREC
RS0=.9076
---------------------------------------- ---------------

MISSOURI NORTHEAST PRAIRIE DIVISION LAT 39 30 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 28. 31. 41. 54. 64. 74. 78. 76. 69. 57. 43. 32. 54.
MEAN R.H. 74. 72. 69. 64. 67. 70. 64. 72. 67. 67. 70. 74. 69.
MEAN PREC 1.83 1.79 2.83 3.51 4.20 4.61 3.47 3.50 3.29 2.95 2.47 1.92 36.37
PREC DEP 1.02 1.10 1.80 2.50 2.86 2.98 1.95 2.14 1.56 1.68 1.38 1.15
POT ET .66 .99 2.29 4.44 6.53 7.69 8.85 6.40 4.55 2.60 1.18 .67 46.85
ETDF -.36 -.11 .49 1.94 3.67 4.71 6.90 4.26 2.99 .92 -.20 -.48 25.88
MAI 1.55 1.12 .79 .56 .44 .39 .22 .33 .34 .65 1.16 1.73
PD = -.269 .697 PREC
RSQ=.9081
- -----------------------~ --------- --

MISSOURI WEST PLAINS DIVISION LAT 38 20 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 33. 36. 46. 57. 66. 75. 79. 78. 71. 60. 47. 36. 57.
MEAN R.H. 73. 70. 66. 63. 68. 70. 64. 64. 65. 65. 69. 72. 67.
MEAN PREC 1.76 1.89 2.61 3.66 4.93 5.07 3.38 3.84 4.01 3.40 2.41 1.91 38.87
PREC DEP .94 1.16 1.64 2.40 3.48 2.68 1.84 2.20 1.80 1.76 1.12 1.14
POT ET .85 1.26 2.81 4.83 6.73 7.88 9.07 7.61 4.98 2.97 1.41 .84 51.25
ETDF -.09 .10 1.17 2.43 3.25 5.20 7.23 5.41 3.18 1.21 .29 -.30 29.47
MAI 1.10 .92 .58 .50 .52 .34 .20 .29 .36 .59 .79 1.35
PD = -.113 .605 PREC
RS:=.8460
-------------------------~-------------------

MISSOURI EAST OZARKS DIVISION LAT 37 30 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 33. 35. 44. 56. 64. 72. 76. 75. 68. 57. 44. 35. 55.
MEAN R.H. 74. 74. 67. 65. 70. 70. 67. 69. 69. 69. 70. 74. 70.
MEAN PREC 2.98 2.85 3.76 4.32 5.01 4.43 3.35 3.42 3.42 3.32 3.44 2.83 43.13
PREC DEP 1.32 1.64 2.30 2.93 3.14 2.42 2.27 2.18 1.90 1.89 1.96 1.64
POT ET .88 1.18 2.71 4.74 6.38 7.60 8.41 6.87 4.59 2.74 1.36 .84 48.30
ETOF -.44 -.46 .41 1.81 3.24 5.18 6.14 4.69 2.69 .85 -.60 -.80 25.01
MAI 1.50 1.39 .85 .62 .49 .32 .27 .32 .41 .69 1.44 1.96
PD = -.465 + .723 PREC
RSQ=.8488
---------------------------- ---------------

MISSOURI BOOTHEEL DIVISION LAT 36 40 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 37. 41. 47. 59. 69. 78. 80. 79. 72. 61. 47. 38. 59.
MEAN R.H. 75. 74. 67. 65. 70. 70. 67. 70. 70. 69. 70. 74. 70.
MEAN PREC 4.33 3.71 4.86 4.29 4.46 3.94 3.34 3.19 3.41 3.12 3.89 3.67 46.21
PREC DEP 2.04 2.12 2.90 2.88 2.79 2.06 2.20 1.88 1.84 1.82 2.06 2.34
POT ET 1.02 1.44 2.98 5.08 6.96 8.32 8.94 7.23 4.89 3.04 1.53 .96 52.39
ETOF -1.02 -.68 .08 2.20 4.17 6.26 6.74 5.35 3.05 1.22 -.53 -1.38 29.07
MAI 2.00 1.47 .97 .57 .40 .25 .25 .26 .38 .60 1.35 2.44
PD : .023 + .577 PREC
RSG=.6296
--------------------------------------------------- ---















TABLE 1 PRECIPITATION AND MOISTURE AVAILABILITY FOR THE SOUTHEAST


GREENSBORO NORTH CAROLINA LAT 36 5 37 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUN OR I.

MEAN TEMP 40. 41. 48. 58. 67. 75. 77. 76. 70. 59. 48. 40. 58.
MEAN R.H. 72. 69. 65. 62. 70. 70. 72. 77. 75. 70. 70. 71. 70.
MEAN PREC 3.40 3.38 3.71 3.28 3.18 3.73 4.71 4.54 3.54 2.69 2.68 3.19 42.03
PREC DEP 2.21 2.30 2.50 2.29 1.81 2.12 3.16 2.53 1.34 1.08 1.38 1.92
POT ET 1.21 1.62 3.19 5.14 6.79 8.02 7.96 6.13 4.40 2.95 1.61 1.11 50.14
ETDF -1.00 -.68 .69 2.85 4.98 5.90 4.80 3.60 3.06 1.87 .23 -.81 27.99
HMA 1.83 1.42 .78 .45 .27 .26 .40 .41 .30 .37 .86 1.73
PD = -.652 + .772 PREC
RSGQ.6690


NORTH CAROLINA NORTHERN PIEDMONT DIVISION LAT 36 10 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUN OR AV.

MEAN TEMP 43. 44. 50. 61. 69. 76. 79. 77. 71. 61. 50. 42. 60.
MEAN R.H. 72. 69. 65. 62. 70. 70. 72. 77. 75. 70. 70. 71. 70.
MEAN PREC 3.52 3.51 3.89 3.62 3.41 4.01 5.20 4.68 3.71 2.77 3.05 3.24 44.61
PREC DEP 2.32 2.44 2.92 2.68 2.23 2.84 3.77 3.06 1.92 1.36 1.58 1.98
POT CT 1.30 1.73 3.32 5.41 7.00 8.12 :8.17 5.21 4.46 3.05 1.67 1.16 51.59
ETDF -1.02 -.71 .40 2.73 4.77 5.28 4.40 3.15 2.54 1.69 .09 -.82 25.04
NAI 1.79 1.41 .88 .50 .32 .35 .46 .49 .43 .45 .95 1.71
PD = -1.037 .931 PREC
RSQ=.8592


NORTH CAROLINA SOUTHERN MOUNTAIN DIVISION LAT 35 30 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 39. 40. 47. 55. 63. 71. 73. 72. 67. 57. 46. 39. 56.
MEAN R.H. 70. 69. 68. 60. 70. 70. 74. 77. 73. 70. 70. 72. 70.
MEAN PREC 4.75 4.46 5.68 4.54 3.88 4.54 5.82 5.49 3.84 3.63 3.57 4.59 54.79
PREC DEP 3.13 2.06 4;34 3.39 2.72 3.26 4;40 3.69 2.27 1.52 2.20 2.76
POT ET 1.26 1.62 3.04 4.92 6.41 7.60 7.29 5.85 4.44 2.91 1.59 1.10 48.04
ETOF -1.87 -.44 -1.30 1.53 3.69 4.34 2.89 2.16 2.17 1.39 -.61 -1.66 18.18
MAT 2.48 1.27 1.43 .69 .42 .43 .60 .63 .51 .52 1.38 2.51
PO = -1.803 # 1.047 PREC
RS0=.8158
----------- -

NORTH CAROLINA NORTHERN MOUNTAINS DIVISION LAT 36 30 35 YEARS

JAN FEB MAR APR MAY JUN 'JUL *" AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 38. 40. 47. 56. 65. 72. 76. 74. 69. 58. 47. 39. 57.
MEAN R.H. 70. 69. 68. 60. 70. 70. 71. 77. 74. 70. 70. 71. 70.
MEAN PREC 3.89 4.05 4.90 4.22 4.13 4.42 5.70 5.50 4.01 3.53 3.45 3.75 51.55
PREC DEP .2.68 2.94 3.75 3.14 2.94 3.14 4.32 3.38 2.21 1.63 2.04 2.33
POT ET 1.16 1.55 2.95 4.92 6.55 7.66 7.96 5.93 4.38 2.85 1.54 1.05 48.50
ETDF -1.52 -1.39 -.80 1.78 3.61 4.52 3.64 2.55 2.17 1.22 -.50 -1.28 19.49
MAI 2.31 1.90 1.27 .64 .45 .41 .54 .57 .51 .57 1.32 2.21
PD = -1.149 .937 PREC
R50=.8019


NORTH CAROLINA PIEDMONT DIVISION LAT 35 40 35 YEARS

JAN FEB MAR APR' MAY JUN JUL AUG SEP OCT NOV DEC SUN OR AV.

MEAN TEMP 43. 45. 51. 61. 69. 76. 78. 77. 72. 62. 51. 43. 61.
MEAN R.H. 72. 69. 65. 64. 70. 70. 73. 77. 75. 70. 70. 72. 71.
MEAN PREC 3.73 3.73 4.25 3.72 3.60 4.02 5.60 4.93 3.86 2.98 3.09 3.49 47.00
PREC DEP 2.46 2.52 3.20 2.84 2.34 2.72 4.14 3.40 2.04 1.47 1.62 2.11
POT ET 1.33 1.81 3.44 5.44 7.03 8.15 7.95 6.26 4.58 3.16 1.75 1.20 52.11
ETOF -1.13 -.71 .24 2.60 4.69 5.43 3.81 2.86 2.54 1.69 .13 -.91 23.99
MAI 1.84 1.39 .93 .52 .33 .33 .52 .54 .45 .47 .92 1.75
PO = -1.255 .977 PREC
RSO=.8971








21






TABLE 1 PRECIPITATION AND MOISTURE AVAILABILITY FOR THE SOUTHEAST


WORTH CAROLINA SOUTHERN PIEDMONT DIVISION LAT. 35 10 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUN OR AV.

MEAN TEMP 42. 45. 50. 61. 70. 77. 79. 78. 72. 62. 51. 43. 61.
MEAN R.H. 72. 69. 65. 64. 70. 70. 74. 77. 75. 70. 70. 72. 71.
MEAN PREC 3.64 3.79 4.40 3.81 3.33 4.10 5.67 4.94 3.87 2.92 2.88 3.49 46.84
PREC DEP 2.44 2.42 3.29 ,2.81 2.14 2.96 4.20 3.54 2.00 1.32 1.44 2.10
POT ET 1.33 1.85 3.41 5.47 7.15 8.26 7.91 6.37 4.62 3.21 1.79 1.24 52.61
ETOF -1.11 -.57 .12 2.66 5.01 5.30 3.71 2.83 2.62 1.89 .35 -.86 24.49
NAI 1.83 1.31 .96 .51 .30 .36 .53 .56 .43 .41 .80 1.70
PD = -1.407 + 1.015 PREC
RSG=.9205


NORTH CAROLINA SOUTHERN COASTAL PLAIN DIVISION LAT 34 50 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 47. 48. 54. 62. 70. 77. 79. 78. 74. 64. 54. 46. 63.
MEAN R.H. 76. 71. 71. 70. 72. 72. 78. 78. 78. 77. 76. 77. 75.
MEAN PREC 3.20 3.64 3.92 3.26 3.59 4.85 6.94 5.86 5.11 2.80 3.01 3.15 49.33
PREC DEP 2.18 2.28 2.74 2.14 2.43 3.38 4.94 4.49 3.08 1.16 1.60 1.90
POT ET 1.41 1.93 3.38 5.08 6.90 7.96 7.26 6.23 4.47 2.92 1.72 1.22 50.48
ETDF -.77 -.35 .64 2.94 4.47 4.58 2.32 1.74 1.39 1.76 .12 -.68 19.97
MAI 1.55 1.18 .81 .42 .35 .42 .68 *72 .69 .40 .93 1.56
PO = -.771 + .843 PREC
RSQ=.9488
--------------- -------------------------

NORTH CAROLINA CENTRAL COASTAL PLAIN ODVISICN LAT 35 20 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 45. 46. 53. 62. 70. 77. 80. 79. 74. 64. 53. 45. 62.
MEAN R.H. 77. 72. 72. 71. 73. 73. 78. 78. 78. 78. 77. 78. 75.
MEAN PREC 3.52 3.78 3.75 3.40 3.71 4.86 7.00 6.08 5.28 3.07 3.41 3.40 51.26
PREC DEP 2.48 2.50 2.90 2.38 2.64 .3.31 4.86 4.40 3.20 1.42 1.92 2.13
POT ET 1.29 1.79 3.23 4.99 6.79 7.85 7.38 6.31 4.45 2.83 1.62 1.14 49.66
ETDF -1.19 -.71 .33 2.61 4.15 4.54 2.52 1.91 1.25 1.41 -.30 -.99 18.72
MAI 1.92 1.40 .90 .48 .39 .42 .66 .70 .72 .50 1.18 1.87
PD = -.390 + .757 PREC
RSO=.9181
-- ---------------------- ----- -- -- -- -- -- -- ---

NORTH CAROLINA NORTHERN COASTAL PLAIN DIVISION LAT 36 0 35 YEARS

JAN FEB MAR APR HAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 44. 46. 51. 61. 8. 75t. 78. 78. 72. 63. 53. 44. 61.
MEAN R.H. 80. 73. 73. 72. 74. 75. 79. 79. 79. 79. 78. 79. 77.
MEAN PREC 3.59 3.70 3.76 3.29 3.51 4.27 6.19 5.86 4.68 3.02 3.29 3.29 48.45
PREC DEP 2.56 2.45 2.84 2.38 2.40 2.96 4.40 4.12 3.02 1.50 1.82 2.20
POT ET 1.13 1.70 2.99 4.77 6.43 7.32 6.99 6.03 4.16 2.65 1.53 1.05 46.75
ETDF -1.43 -.75 .15 2.39 4.03 4.36 2.59 1.91 1.14 1.15 -.29 -1.15 17.72
MAT 2.26 1.44 .95 .50 .37 .40 .63 .68 .73 .57 1.19 2.10
PO = -.451 .786 PREC
RS:=.9302


COLUMBIA SOUTH CAROLINA LAT 34 0 37 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 47. 49. 55. 64. 72. 79. 81. 80. 75. 65. 55. 47. 64.
NEAN R.H. 75. 68. 68. 65. 70. 70. 77. 77. 77. 75. 70. 74. 72.
MEAN PREC 3.11 3.76 4.05 3.69 3;34 3.61 5.42 5 68 3.92 2.24 2.23 3.17 44.22
PREC DEP 1.82 2.08 2.66 2.36 1.70 2.16 3.22 3.04 1.96 1.56 1.02 1.74
POT ET 1.48 2.11 3.66 5.69 7.33 8.41 7.58 6.54 4.68 3.16 2.02 1.38 54.04
ETOF -.34 .03 1.00 3.33 5.63 6.25 4.36 3.50 2.72 1.60 1.00 -.36 29.42
HAI 1.23 .98 .73 .41 .23 .26 .42 .47 *42 .49 .50 1.27
PD = .034 + .563 PREC
RSQ=.8798
-------------------------------------------------------------------














TABLE 1 PRECIPITATION AND MOISTURE AVAILABILITY FOR THE SOUTHEAST


SOUTH CAROLINA WEST CENTRAL DIVISION LAT 33 50 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 46. 48. 55. 63. 71. 78. 80. 80. 75. 63. 53. 46. 63.
MEAN R.H. 75. 68. 69. 65. 70. 70. 77. 77. 77. 75. 70. 74. 72.
MEAN PREC 4.00 4.17 4.86 4.13 3.28 3.79 4.80 4.39 3.64 2.58 2.53 3.86 46.03
PREC DEP 2.62 2.58 3.34 2.68 1.80 2.71 3.60 2.92 1.92 .90 1.14 2.30
POT ET 1.46 2.08 3.61 5.60 7.22 8.29 7.48 6.53 4.69 3.07 1.96 1.36 53.34
ETDF -1.16 -.50 .27 2.92 5.42 5.58 3.88 3.61 2.77 2.17 .82 -.94 27.43
NAT 1.79 1.24 .93 .48 .25 .33 .48 .45 .41 .29 .58 1.70
PD = -1.699 1.062 PREC
RSG=.9524


SOUTH CAROLINA SOUTHERN DIVISION LAT 33 0 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUN OR AV.

MEAN TEMP 49. 51. 57. 64. 72. 78. 80. 80. 76. 66. 56. 49. 65.
MEAN R.H. 77. 72. 70. 70. 70. 72. 78. 79. 79. 79. 76. 76. 75.
MEAN PREC 2.75 3.57 4.02 3.12 3.54 5.09 6.73 -6.16 5.04 2.81 2.15 2.75 47.73
PREC DEP 1.66 1.94 2.18 1.98 2.22 3.36 4.90 4.38 3.08 1.18 1.16 1.52
POT ET 1.54 2.12 3.73 5.29 7.30 7.96 7.27 6.24 4.57 3.00 1.91 1.44 52.37
ETDF -.12 .18 1.55 3.31 5.08 4.60 Z.37 1.86 1.49 1.82 .75 -.08 23.01
MAI 1.07 .92 .58 .37 .30. .42 .67 .70 .67 .39 .61 1.06
PO -.799 .820 PREC
RSQ=.9693


SNSAHVILLE TENNESSEE LAT 36 7 37 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 39. 42. 50. 60. 69. 78. 80. 80. 73. 63. 50. 42. 60.
MEAN R.H. 74. 73. 68. 68. 68. 70. 70. 75. 70. 70. 72. 74. 71.
MEAN PREC 5.07 4.48 5.30 3.95 3.81 3.27 3.81 3.03 2.99 2.11 3.23 4.16 45.21
PREC DEP 2.63 2.65 3.52 2.82 2.29 1.74 2.24 1.80 1.51 .86 1.91 2.54
POT ET 1.13 1.55 3.18 5.00 7.23 8.35 8.57 6.74 5.03 3.16 1.62 1.10 52.65
ETDF -1.50 -1.10 -.34 2.18 4.94 6.61 6.33 4.94 3.52 2.30 -.29 -1.44 30.81
MAZ 2.32 1.72 1.11 .56 .32 .21 .26 .27 .30 .27 1.18 2.31
PD = -.498 .719 PREC
RSQ:.8828

TENNESSEE MIDDLE DIVISION LAT 35 50 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUN OR AV.

MEAN TEMP 40. 42. 50. 59. 68. 76. 78. 78. 72. 60. 49. 42. 59.
MEAN R.H. 74. 73. 68. 68. 68. 70. 70. 75. 70. 70. 72. 74. 71.
MEAN PREC 5.71 4.63 5.73 4.42 3.92 3.82 4.30 3.44 3.16 2.52 3.96 4.58 50.19
PREC DEP 3.17 2.20 4.24 3.34 2.53 2.62 3.22 2.38 1.90 1.24 2.50 2.86
POT ET 1.18 1.56 3.21 4.94 7.14 8.14 8.37 6.59 5.00 3.03 1.61 1.12 51.90
ETDF -1.99 -.64 -1.03 1.60 4.61 5.52 5.15 4.21 3.10 1.79 -.89 -1.74 25.98
MAI 2.68 1.41 1.32 .68 .35 .32 .38 .36 .38 .41 1.55 2.55
PD = -.209 .692 PREC
RSG=.7194


TENNESSEE EASTERN DIVISION LAT 36 0 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUN OR AV.

MEAN TEMP 41. 44. 50. 60. 68. 76. 79. 78. 71. 60. 48. 40. 60.
MEAN R.H. 72. 71. 65. 66. 67. 68. 74. 74. 73. 70. 70. 74. 70.
MEAN PREC 4.73 4.81 5.32 4.00 3.64 3.83 5.30 4.02 2.91 2.63 3.38 4.28 48.85
PREC DEP 3.06 3.27 3.98 3.00 2.67 2.86 4.10 3.02 1.92 1.29 2.10 2.71
POT ET 1.25 1.69 3.34 5.16 7.24 8.40 7.88 6.71 4.65 3.01 1.62 1.06 52.00
ETOF -1.81 -1.58 -.64 2.16 4.57 5.54 3.78 3.69 2.73 1.72 -.48 -1.65 24.20
NAI 2.45 1.94 1.19 .58 .37 .34 .52 .45 .41 .43 1.30 2.57
PD = -.7556 + 881 PREC
RS5=.9125







24







TABLE 1 PRECIPITATION AND MOISTURE AVAILABLE ITY FOR THF SOUTHEAST


TENNESSEE CUMBERLAND PLATEAU DIVISION LAT 35 50 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DFC SUM OR AV.

MEAN TEMP 37. 39. 45. 55. 63. 71. 74. 73. 68. 57. 45. 38. 55.
MEAN R.H. 70. 70. 65. 66. 67. 68. 72. 74. 70. 71. 70. 71. 69.
MEAN PREC 5.70 4.54 6.01 4.52 3.92 4.34 5.09 3.96 3.42 2.69 4.07 5.16 53.42
PREC DEP 3.39 2.59 4.57 3.33 2.72 2.94 3.75 2.90 2.10 1.22 2.60 3.30
POT ET 1.17 1.53 3.01 4.73 6.70 7.84 7.65 6.28 4.71 2.83 1.53 1.07 49.05
ETOF -2.22 -1.06 -1.56 1.40 3.98 4.90 3.90 3.38 2.61 1.61 -1.07 -2.23 21.78
MAT 2.89 1.69 1.52 .70 .41 .38 .49 .46 .45 .43 1.70 3.09
PO = -.713 + .823 PREC
RSQ=.8534


TENNESSEE WESTERN DIVISION LAT 35 40 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUN OR AV.

MEAN TEMP 40. 43. 50. 60. 69. 77. 80. 79. 72. 62. 50. 42. 60.
MEAN R.H. 76. 75.. 68. 68. 69. 70. 68. 75. 70. 70. 69. 75. 71.
MEAN PREC 5.57 4.16 5.54 4.51 4.11 3.90 4.06 3.06 3.40 2.61 4.21 4.43 49.56
PREC DEP 2.74 1.94 3.96 3.30 2.64 2.29 2.86 1.92 1.74 1.05 2.50 2.74
POT ET 1.15 1.55 3.22 5.04 7.15 8.26 8.88 6.70 5.02 3.16 1.74 1.11 52.99
ETDF -1.59 -.39 -.74 1.74 4.51 5.97 6.02 4.78 3.28 2.11 -.76 -1.63 28.41
MAI 2.39 1.25 1.23 .65 .37 .28 .32 .29 .35 .33 1.43 2.47
PO = -.575 + .738 PREC
RSQ=.7106


RICHMOND VIRGINIA LAT 37 30 30 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 39. 40. 47. 57. 66. 74. 78. 76., 70. 59. 48. 40. 58.
MEAN R.H. 70. 68. 65. 65. 77. 73. 73. 78. 78. 73. 71. 70. 72.
MEAN PREC 3.03 3.06 3.37 2.84 3.50 3.87 5.62 5.19 3.62 3.07 3.22 3.07 43.46
PREC OEP 2.08 2.12 2.38 1.88 2.15 2.34 2.94 2.47 2.10 1.51 1.58 2.02
POT ET 1.12 1.50 2.99 4.83 5.76 7.42 7.82 5.87 3.98 2.65 1.46 1.03 46.44
ETOF -.96 -.62 .61 2.95 3.61 5.08 4.88 3.40 1.88 1.14 -.12 -.99 23.55
MAI 1.85 1.41 .80 .39 .37 .32 .38 .42 .53 .57 1.08 1.96
PD = .876 + .346 PREC
RSO0.6308


VIRGINIA EASTERN PIEDMONT DIVISION LAT 37 30 35 TEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUI OR AV.

MEAN TEMP 38. 40. 45. 58. 65. 73. 77. 76. 69. 58. 47. 38. 57.
MEAN R.H. 70. 68. 65. 65. 77. 73. 73. 78. 78. 73. 71. 70. 72.
MEAN PREC 3.45 3.09 3.77 3.41 3.54 3.79 4.89 4.62 3.54 2.86 3.04 3.04 .3.04
PREC OEP 2.28 2.26 2.84 2.35 2.26 2.72 3.41 2.78 2.12 1.53 1.60 1.92
POT ET 1.09 1.50 2.86 4.91 5.67 7.32 7.71 5.87 3.92 2.60 1.43 .98 45.88
ETOF -1.19 -.76 .02 2.56 3.41 4.60 4.30 3.09 1.80 1.07 -.17 -.94 20.86
MAI 2.09 1.50 .99 .48 .40 .37 .44 .47 .54 .59 1.12 1.96
PD = -.435 + .773 PREC
RS0=.8034


VIRGIN TIDEWATER DIVISION LAT 37 20 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 40. 41. 49. 58. 66. 74. 77. 76. 70. 60. 50. 41. 58.
MEAN R.H. 77. 70. 70. 78. 79. 77. 78. 78. 79. 79. 77. 78. 77.
MEAN PREC 3.40 3.12 3.58 3.15 3.51 3.81 5.23 5.11 3.89 3.03 2.98 2.85 43.66
PREC DEP 2.38 2.27 2.75 2.28 2.20 2.76 3.71 3.28 2.33 1.70 1.67 1.94
POT ET 1.02 1.50 2.90 3.91 5.52 6.86 6.97 5.88 3.91 2.39 1.37 .91 43.16
ETDF -1.36 -.77 .15 1.63 3.32 4.10 3.26 2.60 1.58 .69 -.30 -1.03 17.34
MAI 2.34 1.51 .95 .58 .40 .40 .53 .56 .60 .71 1.22 2.12
PD = -.144 + .710 PREC
RSQ=.8499















TABLE 1 PRECIPITATION AND MOISTURE AVAILABILITY FOR THE SOUTHEAST


VIRGINIA WESTERN PIEDMONT DIVISION LAT 37 10 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 38. 40. 46. 57. 65. 72. 76. 75. 68. '58. 47. 38. 57.
MEAN R.H. 70. 68. 62. 60. 72. 70. 70. 78. 78. 73. 70. 70. 70.
MEAN PREC 3.37 3.17 3.98 3.58 3.79 4.03 4.76 4.49 3.95 3.03 3.03 3.24 44.42
PREC DEP 2.21 2.20 2.92 2.61 2.61 2.86 3.70 2.77 2.00 .1.56 1.64 2.02
POT ET 1.11 1.53 3.01 4.95 6.28 7.62 8.05 5.82 3.90 2.64 1.49 1.00 47.39
ETDF '-1.10 -.67 .09 2.34 3.67 4.76 4.35 3.05 1.90 1.08 -.15 -1.02 21.23
MAI 1.98 1.44 .97 .53 .42 .38 .46 .48 .51 .59 1.10 2.02
PD = -1.021 + .931 PREC
RSQ=.7526
-- ---- ----- -- -- -- - ------- -- -- -- -- -- -- -- ---

VIRGINIA NORTHERN DIVISION LAT 38 40 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 36. 38. 43. 55. 63. 70. 74. 72. 66. 57. 46. 36. 55.
MEAN R.H. 70. 68. 60. 60. 71.. 70.. 70. 78. 75. 70. 70. 70. 69.
MEAN PREC 2.79 2.50 3.45 3.30 3.89 3.66 4.11 4.37 3.36 3.23 2.94 2.74 :40.34
PREC DEP 1.86 1.74 2.46 2.23 2.56 2.78 2.84 2.81 2.14 1.44 1.60 1.65
POT ET .96 1.35 2.68 4.63 6.08 7.31 7.71 5.44 3.87 2.57 1.33 .85 44.79
ETDF -.90 -.39 .22 2.40 3.52 4.53 4.87 2.63 1.73 1.13 -.27 -.80 21.03
MAI 1.93 1.29 .92 .48 .42 .38 .37 .52 .55 .56 1.20 1.93
PD = -.400 + .766 PREC
RSQ=.7354


VIRGINIA CENTRAL MOUNTAIN DIVISION LAT 38 0 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 35. 37. 44. 54. 63. 71. 75. 73. 67. 56. 44. 36. 55.
MEAN R.H. 70. 70. 65. 70. 70. 70. 75. 77. 77. 70. 70. 70. 71.
MEAN PREC 2.85 2.71 3.54 3.04 3.68 3.74 4.18 4.22 3.29 2.96 2.69 2.78 39.68
PREC DEP 1.84 1.80 2.55 2.14 2.52 2.86 3.18 2.58 1.94 1.40 1.57 1.77
POT ET .97 1.31 2.75 4.19 6.24 7.46 7.19 5.71 3.84 2.59 1.32 .89 44.47
ETDF -.87 -.49 .20 2.05 3.72 4.60 4.01 3.13 1.90 1.19 -.25 -.88 20.79
MAI 1.89 1.37 .93 .51 .40 .38 .44 .45 .51 .54 1.19 1.98
PD : -.751 + .886 PREC
RSQ=.7968
-- -- --- - -- ---- -

VIRGINIA SOUTHWESTERN MOUNTAIN DIVISION LAT 37 0 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUN OR AV.

MEAN TEMP 35. 36. 43. 52. 61. 68. 71. 70. 65. 54. 43. 36. 53.
MEAN R.H. 72. 68. 68. 65. 68. 72. 75. 75. 68. 72. 71. 70.
MEAN PREC 3.57 3.54 4.25 3.38 3.81 3.92 4.87 4.18 3.06 2.54 2.76 3.23 43.11
PREC DEP 2.43 2.51 3.23 2.46 2.64 3.04 3.92 2.98 1.94 1.30 1.88 2.13
POT ET 1.00 1.38 2.65 4.44 6.10 7.43 7.25 5.79 3.98 2.69 1.32 .94 44.97
ETDF -1.43 -1.13 -.58 1.98 3.46 4.39 3.33 2.81 2.04 1.39 -.56 -1.19 19.40
MAI 2.43 1.82 1.22 .55 .43 .41 .54 .51 .49 .48 1.42 2.27
PD = -1.185 4 1.036 PREC
RSQ=.9687
----------- -------------------------------------------- --------------

CHARLESTON WEST VIRGINIA LAT 38 22 37 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 37. 39. 46. 56. 65. 73. 77. 76. 70. 59. 47. 38. 57.
MEAN R.H. 72. 72. 68. 68. 69. 70. 78. 78. 75. 70. 70. 72. 72.
MEAN PREC 3.64 3.25 3.92 3.44 3.-8 3.32 5.30 3.54 2.64 2.24 2.73 2.82 40.32
PREC DEP 1.20 1.12 1.36 1.63 1.57 1.13 1.73 1.13 .83 .64 .88 1.28
POT ET .97 1.32 2.72 4.45 6.52 7.66 6.91 5.79 4.15 2.69 1.39 .89 45.45
ETDF -.23 .20 1.36 2.82 4.95 6.53 5.18 4.66 3.32 2.05 .51 -.39 31.57
MAT 1.23 .85 .50 .37 .24 .15 .25 .20 .20 .24 .63 1.44
PO = .078 .336 PREC
RSQ=.6283
----------------------------------------------















TABLE 1 PRECIPITATION AND MOISTURE AVAILABILITY FOR THE SOUTHEAST


WEST VIRGINIA SOUTHWESTERN DIVISION LAT 38 20 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 34. 36. 43. 54. 64. 71. 75. 74. 67. 56. 44. 35. 54.
MEAN R.H. 72. 72. 68. 68. 69. 70. 78. 78. 75. 70. 70. 72. 72.
MEAN PREC 3.65 3.29 4.29 3.54 3.70 4.08 5.02 3.68 2.89 2.27 2.81 2.98 42.20
PREC DEP 2.45 2.18 3.17 2.57 2.47 3.14 3.83 2.68 1.96 1.20 1.84 1.89
POT ET .90 1.21 2.54 4.29 6.42 7.44 6.72 5.63 3.97 2.56 1.30 .82 43.80
ETDF -1.55 -.97 -.63 1.72 3.95 4.30 2.89 2.95 2.01 1.36 -.54 -1.07 19.18
NAI 2.74 1.80 1.25 .60 .38 .42 .57 .48 .49 .47 1.42 2.30
PO = -.884 + .947 PREC
RSQ=.9808


WEST VIRGINIA NORTHWESTERN DIVISION LAT 39 30 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR N.

MEAN TEMP 32. 33. 40. 52. 61. 70. 73. 72. 65. 55. 42. 33. 52.
MEAN R.H. 75. 75. 68. 70. 68. 70. 70. 74. 70. 70. 70. 75. 71.
MEAN PREC 3.28 2.82 3.90 3.61 3.80 4.34 4.30 3.88 3.00 2.40 2.70 2.82 40.85
PREC DEP 2.09 1.88 2.73 2.64 2.63 3.20 3.28 2.64 1.97 1.38 1.84 1.89
SPOT ET .74 .99 2.27 3.90 6.12 7.26 7.54 5.83 4.08 2.39 1.16 .67 42.95
ETOF -1.35 -.89 -.46 1.26 3.49 4.06 4.26 3.19 2.11 1.01 -.68 -1.22 19.38
MAT 2.83 1.90 1.20 .68 .43 .44 .43 .45 .48 .58 1.59 2.81
PD = -.676 + .888 PREC
RSQ=.9727


WEST VIRGINIA NORTH CENTRAL DIVISION LAT 39 0 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR V.

MEAN TEMP 35. 35. 43. 53. 63. '71. 75. 73. 67. 56. 44. 36. 54.
MEAN R.H. 75. 75. 68. 70. 68. 70. 70. 74. 70. 70. 70. 75. 71.
MEAN PREC 3.74 3.23 4.21 3.75 4.06 4.73 4.81 4.41 3.33 2.74 2.98 3.30 45.29
PREC DEP 2.56 2.36 3.14 2.84 2.80 3.56 3.77 3.06 2.28 1.52 2.01 2.20
POT ET .84 1.08 2.43 4.02 6.36 7.40 7.80 5.97 4.27 2.49 1.25 .76 44.72
ETOF -1.72 -1.28 -.65 1.18 3.56 3.84 4.U3 2.91 1.99 .97 -.76 -1.44 18.47
' MAI 3.06 2.19 1.26 .71 .44 .48 .48 .51 .53 .61 1.61 2.89
PD = -.858 + .936 PREC
RSB=.9558
-- -------------~-----------*---*,,,, ,,,,, _

WESTVIRGINIA CENTRAL DIVISION LAT 38 30 35 YEARS

JAN FEB MAR AR MAY JUN JUL AUG SEP OCT NOV DEC SUN OR AV.

MEAN TEMP 32. 33. 40. 50. 58. 66. 70. 68. 62. 52. 40. 32. 50.
MEAN R.H. 72. 70. 70. 70. 70. 72. 78. 78. 78. 72. 70. 72. 73.
MEAN PREC 4.11 3.83 4.85 4.07 4.56 4.88 5.40 4.75 3.42 3.13 3.19 3.62 49.81
PREC DEP 3.09 2.98 3.84 3.26 3.34 3.95 4.28 3.48 2.46 1.84 2.33 2.61
POT ET .83 1.14 2.27 3.93 5.69 6.66 6.25 5.14 3.42 2.27 1.17 .74 39.42
ETDF -2.26 -1.84 -1.57 .57 2.35 2.71 1.97 1.66 .96 .43 -1.16 -1.87 10.65
MAI 3.71 2.61 1.69 .85 .59 .59 .69 .68 .72 .81 2.00 3.52
PD = -.834 + .953 PREC
R50=.9509
------------------------- ----------------------

WEST VIRGINIA SOUTHERN DIVISION LAT 37 40 35 YEARS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 30. 32. 37. 48. 57. 64. 68. 67. 61. 51. 39. 32. 49.
MEAN R.H. 72. 70. 70. 70. 70. 72. 78. 78. 78. 72. 70. 72. 73.
MEAN PREC 3.13 3.09 3.99 3.07 3.59 3.70 4.38 3.72 2.74 2.27 2.46 2.80 38.94
PREC DEP 2.05 2.22 2.94 2.18 2.58 2.78 3.29 2.66 1.80 1.18 1.69 1.90
POT ET .82 1.15 2.16 3.73 5.65 6.49 6.11 5.13 3.44 2.31 1.19 .78 38.97
ETOF '-1.23 -1.07 -.78 1.55 3.07 3.71 2.82 2.47 1.64 1.13 -.50 -1.12 16.39
MAT 2.49 1.93 1.36 .58 .46 .43 .54 .52 .52 .51 1.42 2.42
PD = -.732 + .926 PREC
RSQ=.9754









27






TABLE 1 PRECIPITATION AND MOISTURE AVIIABILITY FOR THE SOUTHEAST


WEST VIRGINIA NORTHEASTERN DIVISION LAT 39 10 35 YAPRS

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC SUM OR AV.

MEAN TEMP 34. 36. 42. 54. 63. 71. 74. 73. 66. 56. 44. 36. 54.
MEAN R.H. 70. 72. 70. 67. 70. 72. 79. 79. 77. 72. 70. 71. 72.
MEAN PREC 2.36 2.14 3.17 2.96 3.45 3.58 3.57 3.80 2.79 2.86 2.32 2.21 35.21
PREC DEP 1.56 1.44 2.20 2.04 2.39 2.80 2.70 2.39 1.76 1.36 1.38 1.38
POT ET .88 1.17 2.34 4.29 6.15 7.14 6.42 5.35 3.66 2.39 1.24 .81 41.82
ETDF -.68 -.27 .14 2.25 3.76 4.34 3.72 2.96 1.90 1.03 -.14 -.57 20.08
MAI 1.77 1.23 .94 .48 .39 .39 .42 .45 .48 .57 1.12 1.70
PO = -.500 .835 PREC
RSG=.8270
------------------------------------------------









TABEL 2 POTENTIAL EVAPOTRANSPIRATION FACTOR IN INCHES PER MONTH ,MF


NORTH
LAT JAN


FEB


MAR


APR


MONTH
MAY JUN


49 .013 .021 .042 .065 .092
48 .014 .022 .044 .067 .094
47 .016 .024 .046 .069 .096
46 .017 .026 .048 .071 .097
45 .019 .027 .050 .073 .099


.102
.103
.105
.106
.108


44 .021 .029 .052 .075 .101 .109
43 .022 .031 .054 .077 .102 .110
42 .024 .032 .056 .079 .104 .111
41 .026 .034 .058 .081 .105 .113
40 .027 .036 .060 .083 .107 .114

39 .029 .038 .063 .084 .108 .115
38 .031 .040 .065 .086 .109 .116
37 .033 .042 .067 .088 .111 .117
36 .035 .044 .069 .089 .112 .117
35 .037 .045 .070 .091 .112 .118

34 .039 .046 .071 .091 .112 .117
33 .040 .048 .073 .091 .111 .116
32 .042 .049 .074 .091 .111 .115
31 .043 .050 .074 .092 .110 .114
30 .045 .052 .075 .092 .110 .113

29 .045 .053 .076 .092 .109 .112
28 .048 .054 .077 .092 .109 .111
27 .049 .055 .078 .093 .108 .110
26 .051 .056 .079 .093 .108 .100
25 .052 .058 .083 .093 .107 .108


.100 .078 .050
.101 .080 .052
.103 .082 .054
.105 .084 .056
.106 .086 .058

.108 .088 C.60
.109 .090 .062
.110 .091 .064
.112 .093 .066
.113 .095 .068

.114 .097 .07G
.115 .098 .072
.116 .100 .074
.117 .101 .076
.113 .102 .077

.117 .102 .078
.116 .102 .079
.116 .102 .080
.115 .102 .080
.114 .102 .081

.113 .102 .082
.112 .102 .082
.112 .102 .083
.111 .101 .083
.110 .101 .084


.029 .015 .011
.031 .017 .012
.033 .018 .013
.035 .C20 .015
.037 .021 .016

.039 .023 .018
.041 .025 .019
.043 .026 .021
.045 .028 .022
.047 .030 .024

.049 .032 .026
.051 .034 .028
.053 .036 .030
.056 .038 .032
.057 .039 .033

.059 .041 .035
.060 .042 .037
.061 .044 .038
.063 .045 .040
.0E4 .047 .041

.065 .048 .043
.066 .050 .044
.067 .051 .046
.069 .052 .048
.070 .054 .049


JUL


AUG


SEP


0 CT


NOV


0 EC














TABLE 3. MEAN DAILY POTENTIAL EVAPOTRANSPOrATTCN IN INCHES PEP DAY


MONTSOMERY ALABAMA


DAY JAN. "EB. MAR. APR. MAY


JUNE JULY AUG.


SEP. CCT.


NOV. FEC.


1 .Ct7 .C63 .100 .147 .2C1 .262 .259 .234
2 .047 .054 .102 .143 .203 .263 .258 .233
3 .C47 .C04 .103 .15G .205 .254 .253 .232
4 .C47 .065 .105 .152 .207 .264 .258 .231
5 .C48 .056 .105 .154 .208 .26E .258 .230


S.C43 .067 .103 .156 .210 .255 .257 .229
7 .C43 .OG3 .103 .158 .212 .265 .257 .228
8 .043 .059 .111 .150 .214 .266 .255 .227
3 .C04 .07C .112 .162 .215 .266 .256 .22
1C .C49 .070 .114 .164 .217 .267 .255 .225


11 .C43 .071 .116 I156 .219 .267 .225 .224,
12 .043 .072 .117 .158 .221 .267 .254 .222
17 .C5C .073 .11'3 .170 .222 .267 .254 .221
14 .C5C .074 .121 .172 .224 .268 .253 .22C
15 .0EC .075 .122 .174 .226 .268 .253 .219


.193 .138 .085 .050
.191 .136 .C94 .050
.189 .134 .083 5C
.187 .132 .032 .C49
.185 .130 .C0 C .E C4


.183 .128 .079 049
.181 .125 .078 .049
.179 .124 .077 .049
.177 .122 .C7G .048
.175 12C .075 04


.172 .118
.170 .116
.168 .114
.166 .112
.154 .111


.074 .048
.C72 .043
.C71 .048
.070 .043
S.059 47














TABLE 3 CONTINUED


DAY JAN. FEB.


MAR. APR. MAY


JUNE JULY AUC.


SEP. OCT.


NOV DEC.


.051 .076
.051 .077
.052 .078
.052 .079
.052 .081


.053 .092
.053 .083
.054 .084
.054 .035
.055 .036


.055 .037
.056 .088
.C55 .030
.057 .000
.057 .CC


.124
.126
.127
.129
.131


.132
.134
.136
.133
.140


. 141
.143
.14S
.147
. 143


.176 .227
.178 .229
.180 .231
.182 .232
.183 .234


.135 .235
.137 .237
.189 .239
.191 .240
.193 .242


.195 .243,
.137 .245
.199 .246
.201 .248
.203 .249


.268
.268
.268
.268
.269


.269
.269
.269
.269
.268


.268
.268
.268
.268
.268


.252 .218
.252 .216
.251 .215
.250 .214
.249 .213


.249 .211
.248 .210
.247 .209
.246 .207
.246 .206


.245 .205
.244 .203
.243 .202
.242 .200
.241 .199


.150 .OCC .251 .000 .240 .198


.162 .109 .068 .047
.16C .107 .067 .047
.158 .105 .067 .047
.155 .104 .066 .047
.154 .102 .065 47


.152 .1C0 .C64 .047
.150 .098 .063 .047
.148 .097 .062 .047
.146 .095 .061 .047
.144 .094 .061 .047


.143 .092 .060 .047
.141 .091 .059 .047
.139 .039 .058 .047
.137 .088 .058 .048
.135 .086 .057 .048


.CCO .085 .000 .048


31 .C58 .000






31
APPENDIX I REFERENCES

1. Environmental Data Service, "Climatic Atlas of the United States,"
U.S. Dept. of Commerce, Environmental Science Services
Administration, 1968, 80 p.

2. Environmental Science Service Administration, "Monthly
Precipitation Probabilities by Climatic Divisions, 23 Eastern
States from the Great Lakes to the Gulf Coast," U.S. Dept. of
Agr. Economic Research Service, and U.S. Dept. of Commerce,
Miscellaneous Publication 1160, 1969, 141 p.

3. llargreaves, George H., "The Evaluation of Water Deficiencies,"
Age of Changing Priorities for Land and Water, Irrigation and
Drainage Division Specialty Conference, ASCE, Spokane, Washington,
September 1972, page 273-290.

4. Hargreaves, George H., "The Estimation of Potential and Crop
Evapotranspiration," Paper No. 73-4537 ASAE Winter Meeting,
Chicago, Illinois, December 1973, 16 p.

5. Hargreaves, George H. and J. E. Christiansen, "Production as a
Function of Moisture Availability," ITCC Review, Vol. III No.
1(9), Association of Engineers and Architects in Israel, January
1974, p. 179-189.

6. Mirnezami, Hossein, "The Relationship Between the Climate and Dry
Farmed Wheat in Iran," M.S. Thesis, Utah State University, Logan,
Utah, 1972, 188 p.

7. Wernstedt, Fredrick L., "World Climatic Data" Climatic Data Press,
1972, 522 p.















APPENDIX II COMPUTER PROGRAM FOR PRODUCING TABLE 1





1* DIMENSION NAMEt 83 TM(131 HM(13).PREC(t313PD 12 )e CEC(12, ESt12) DM1
2 1123)Z(12) OM(12 )(DL 121eRLD(12),CH(IZ123RMti(12T) ETP(133 ETDF(13)lMA
3* 21(133)DFt(133TC (12)
4* REAL MAI
5* DATA (DMtI. M) =1,12)/31. 28.*3.1.30.,31.,30. 3 1. t31. ,30. 31. 30.
6* 131./
7. C DM IS NUMBER OF DAYS IN THE MONTH
8* DATA (DECIM) M=1l12)/-.3656.-.2365t-.04682..I107 9.3247 ,.4017.
9* $.3699,.2360,.03995.-.1669,-.3291.-.4021/
10e C DEC IS DECLINATION IN RADIANS
11* DATA (EStM) M=l 12/.97104..98136*.99653.1.0313 1 .02625 1.032'41 1
12* $.02987.1.01916.1.00347T.98693,.97369,.96812/
13* C ES IS MEAN MONTHLY DISTANCE OF THE SUN TO THE EARTH DIVIDED BY THE
14* C MEAN ANNUAL DIATANCE
151 2 JJ=O
16* WRITE(6.102)
17 '102 FORMAT(1H1w'TABLE 1 PRECIPITATION AND MOISTURE A %AILABILITY FOR TH
18* 1E SOUTHEAST *)
19* WRITET6.203)
20* 3 READ(5.100,END=261) NAMELD.LOM.NYR
21* C NAME IS STATION OR DIVISION
22 C LD IS LATITUDE. IN DEGREES LOM IS LATITUDE IN MINUTES
23* C NYR IS NUMBER DF YEARS OF RECORD
24* 100 FORMATI9X.8AS*3X*.12.132XvI2)
250 READ(5120D (TM(M)eM=1,12)
260 .C TM IS MEAN TEMPERATURE IN DEGREES FAHRENHEIT
27. READI5.120) (HM( lIM=112)
28* C HM IS MEAN RELATIVE HUMIDITY IN PERCENT
29s READ(.51213 (PRE CtM lM=1.121
30* C PREC IS MEAN PRECIPITATION IN INCHES
31* READI5,121)(PDOtM)M=1.12)
32* C PD IS THE 75 PERCENT PROBABILITY OF PRECIPITATION
33* 120 FORMAT(5SX12FS.0)
34" 121 FORMAT(5X12F5.2)
350 JJ=JJ*1
36e XLA=tFLOAT(LD) FLOAT(LDM)/6D0.
37s C XLA IS LATITUDE IN DEGREES AND DECIMALS
38s XLR=(FLOAT LD)+FLOATI LD MI/60.1/57.2958
39* C XLR IS LATITUDE IN RADIANS
40* PRINT 101.NAME.LD.LOM.NYR
'41 101 FORMATI' / 8X.8A6.* LAT'II13.GX. 153 YEARS' /
42* 1 '0 JAN FEB NAR APR MAY JUN JUL AUG SEP
43* 2 OCT NOV DEC SUN OR AV. /I
4'* TM(133=0
45* HM(133=0
G6* PREC(13)--
47* ETPtI3)=0
'48 DFI13)=0
49* SPM=O
50. SDDO=
510 SSPM=0
52 SSDD=O
53' XP=0
54' XN=12.
550 DO 4 M=1.12
56 SPM=SPM+PREC(MN
57* SDD=SDDOPDIM)
58* XP=XP+PRECI(M)pO(CM
59* SSPM=SSPM+PREC(M)*PREC(M)
60* SSDD=SSDD+PDt( .*PD(M)
61* TC(MI=(TM(M)-32.)/1.8
62e Z(MN=-TAN(XLR)*TANIDECtMl3
63s OM(M=ACOStZIMI )
64* DLI MI=OMI( /.1309
65* C DL IS DAY LENGTH IN HOURS (SUNRISE TO SUNSET)
66* RLDtM)=916.732* (OM( ) *SN (XLR)*SIN(DECfmI )+COS IXL! *COS( DEC(Mn )S
67* 1NIOM(M) )/ES(M)
68* RMM(M=D0M(M3*10.*RLO(MN/(595.9-.SSTCIM))















APPENDIX II CONTINUED





69* C RMM IS EXTRATERRESTRIAL RADIATION IN W PER MONTH
70* CH MI=.166* SORT 1100.-HM (HI)
71* IFtCH(tM.GT.1.l CHfM)=1.
72. CLA=.17*SGRT(7I .-ABS( XLAl)
730 IF(CLA.GT.1.00O CLA=1.00
74* ETP(M)=.0000158*RMM(M )OLtM)*TM(M)*CH(M)lCLA
750 C ETP IS POTENTIAL EVAPOTRANSPIRATION IN INCHES
76. ETDF(M)=ETP(M)-PD(M)
.77* MAI(M)=PDt(M/ETP(fM
78e IF(ETDF(M).GT.O.01O DFtMI=ETDFIM)
79* IFtETDFtM).LE.0.01)OFnfM=0
80 DFtl33)=DF(1f3)+Ft(M
81e TMI13)=TM(13)+TN(M)
82* HM(13)=HM(13)H(Mt)
83o PREC(13)=PREC(13)EPREC(M)
84. ETPt13 =ETPi131 4ETP(M
85* 4 CONTINUE
86 TOP=XN*XP-SPM*SOD
87o BOTTOM=XN*SSPM-SPM*SPM
88* YBAR=SOD/XN
89 XBAR=SPM/XN
90* BETA=TOP/BOTTOM
91 ALPHA=YBAR-BETA *XBAR
92o RSQ=(TOP*TOP/f(BOTTOMH(XN*SD-SDD-SDD ODD)
93* TM(13)=TM(13)/12.
949 HM(13)=HMi13)/1Z.
95* ETDOF13)=OF(13)
96* PRINT 103(TMtMNl.HtM=13
97o 103 FORMAT(' MEAN TEMP't 12F6.0F8.01
98* PRINT 10@( HNMlt )M=l131
99* 104 FORMATT( MEAN R.H.'. 12F6.0OF8.0)
100* PRINT 105(PREC IM),M=1.131
101* 105 FORMATI* MEAN PREC'w 12F6.2F8.2)
102* PRINT 106.(PO(MtM--M=112
103o 106 FORMATI' PREC DEP *12F6.21
104* PRINT 107.(ETP(M).M=1.13)
105* 107 FORMAT(' POT ET 't 12F6.2F8.2)
106* PRINT 108.( ETDF MlIM=1.131
107* 108 FORMAT(I ETOF *1ZF6.2F8.2)
108* 109 FORMAT(I MAI '. 12F6.2)
109* PRINT 1099tMAI(M).M=1l12)
110* WRITE(6.301)ALPHABETA
111* 301 FORMAT20OX*PO =*.F7.3.S +* *F7.3e PREC')
112* WRITE(63023RSO
113* 302 FORMAT(20X'*RSQ=*.FS.4
114 203 FORMAT(1H '*----------------- -- ----
115* 1 ------------. ------ ----- 1
116* WRITE(6.203)
117* 205 FORMATlIH1 /////)
118 IF(JJ.EQ.3) WRITEt69205)
119 IF(JJ.EG.3) WRITEtE(203)
120* IFfJJ.EQ.5 60G TO 2
121* GO TO 3
1229 261 STOP
123# END











APPENDIX III COMPUTER PROGRAM FOR DAILY POTENTIAL EVAPOTRANSPIRATION



1 C CALCULATION OF DAILY VALUES OF EXTRATCPPESTRIAL RADIATION ANID DAY
2* C LENGTH (RM' AND OL)
3. C ---- --------------------
4* DIMENSION DM( 31 ),ETPD (31! 12),HM(12).At71 TA( 12) *DT 31)
5 DATA (D(MIHr M:112)/31.,*2.,31.,30.,31.,*3.,31.,31.*3E..31.*3C.
6* 131./
7. C DMzNUMDER OF DAYS IN THE MONTH
8* DATA (HM(MI, MZ=.12.)/77.,75.,70..72..73. 73..76..77.786.*74. 73. *
9* 176./
10. C HM=MEAN MONTHLY RELATIVE HUMIDITY IN PERCENT
11* DATA (TA(M), M=1112)/49.,52..57..65..73.,8O.,82. 82.77T.96..*55.94
-12* 19./
13* C TA=AVERAGE TEMPERATURE IN DEGREES FAHRENHETT FOR THE MONTH
14* C D=DAY OF THE YEAR (JAN 1=1)
15 D=O.
16* READ (5.200)(A(I) ,I1,7),LDLDM
17* C LDrDEGREES OF LATITUDE
18* C LDM=MINUTES OF LATITUDE
"19 DO 90 M=1.12
20* DTF=O.0
21 ND:CM(M)
22* 00 8C K=lrND
23* D=D+1.
24* DT(K)-(TA(M+1)-TA(M-1))/SO.
25 DTF=DTF+DT(K)
26* TMF=DTF+(TA(M-1)+TA(I1 ))/2.
27* IFM.E.E..1.O.R.M.E.E.0R.M.EQ.7.DR.M.EC.8.CR.M.EO.12) TMF=TA(M I
29 C TMF=MEAN DAILY TEMPERATURE IN DEGREES FAHrENHEIT
29* TM=(TMF-32.)/1.8
30* Y=COSID.C172142:(D+192.))
31* -DER=C.4C876*Y
32 DECL=57.295S*DER
33. C DEC=DECLINATION (ANCLE CF THE SUN)
34* ES=1.C0028+.D3269*Y
35. C ES=DISTANCE CF THE SUN TO THE EARTH DIVIDED BY T PH MEAN DISTANCE
36* XL'=(FLOATtLD )* FLOATI LO,)/GC.)/57.2:58
37* C XLR IS LATITUDE IN RADIANS
38* Z=-TAN( XLR) TAN (DER)
39* OM:ACOS(Z)
40* DL=0M/D.1i3G3
41. XLA= ABS(XLR*57.3)
42* RLD=12D.((DL*SIN(XLR) *SIN(DER)+7.639*CCOSXLR)*COSIDERI)SIN(OM) l/ES
43 RMDzlOC.RLD/(595.0-.55*TMH)
44* C RMDOEXTRATERRESTRIAL RADIATION IN EQUIVALENT MM CF EVAPORATION AT T1
45* C TK= MEAN TEMPERATURE IN DEG CENTIGRADE FOR THE DAY OR AVE PERIOD
46* CH=.1566SQRT(10C.-HM(Ml
47* IF(CH.GT. 1.C) CH=1.0
498 C CH IS A COEFICIENT FOR RELATIVE HUMIDITY
492 CLA=.17*SQRT(70.-AS (XLA))
50 IF(CLA.GCT.1.DC) CLA=l.CC
51* C CLA IS A COEFFICIENT FOR LATITUDE
52* DFz=RMD`*L/12. *CLA*.C0G190
53* C DF=POTENTIAL EVAPOTRANSPIRATION FACTOR IN INCHES PER DAY
54* ETPD(K,M)=DF*TMI*CH
55' C ETPD=DAILY ETP IN INCHES PER CAY
56' 80 CONTINUE
57* 20 CONTINUE
58. WRTTE (6,2C1)
59* WRITE (6,203)A
60' WRITE (6,204)
61. K= 0
62* .DC 20 I= 1,31
63" IF (I.NE.16) GO TO 9
64* WPITE (6,ZC7)
65* WRITE (6.2C4)
66. 9 IF (K.LT.5) GO TO 10
67. WRITE (6,2C6)
*69 K= 0
69* 10 WRITE (6.205) I,(ETPD (I,J),J=l,121
70* K= K+1
71* 20 CONTINUE
72* 2CO FORMAT ( GX7A6, 11X213)
73* 201 FORMAT t'lTABLE 3. MEAN DAILY POTENTIAL EVAPOTANSPORATIONN IN INCH
74. 1ES PER DAY './)
75* 203 FORMAT (16X,7AGi/l
76- 204 FORMAT (/,' DAY JAN. FER. HAr. APP. MAY JUNE JULY
77 1 AUC. SEP. OCT. NOV. DEC. *I//I
7Rn 2C5 FORMAT lI3,12F7.3)
79' 206 FCRNAT (' '/)
8C0 207 FORMAT (I'lTAEL 3 CONTINUED',/,)
81. STOP




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