• TABLE OF CONTENTS
HIDE
 Front Cover
 List of Tables
 Summary
 Table 1: Monthly precipitation
 Table 2: Pobability of receiving...
 Table 3: Average size of storm
 Table 4: Daily average maximum...
 Table 5: Daily average minimum...
 Table 6: Daily average mean...
 Table 7: Extreme daily maximum...
 Table 8: Extreme daily minimum...
 Table 9: Date of occurrence of...
 Table 10: Frost dates and length...
 Table 11: Summary of meteorological...






Group Title: Bulletin ;, 509S
Title: Meteorological data 1887-1957
CITATION PAGE IMAGE ZOOMABLE PAGE TEXT
Full Citation
STANDARD VIEW MARC VIEW
Permanent Link: http://ufdc.ufl.edu/UF00055288/00001
 Material Information
Title: Meteorological data 1887-1957 a summary of 71 years of meteorological data at the Colorado Agricultural Experiment Station, Fort Collins, Colorado
Series Title: Bulletin
Physical Description: 17 p. : ; 23 cm.
Language: English
Creator: Parshall, Maxwell
Publisher: Colorado State University, Experiment Station
Place of Publication: Fort Collins
Publication Date: 1961
 Subjects
Subject: Meteorology -- Observations -- Colorado   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
statistics   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: by Maxwell Parshall.
General Note: Cover title.
Funding: Bulletin (Colorado Agricultural Experiment Station) ;
 Record Information
Bibliographic ID: UF00055288
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 - 04124109

Table of Contents
    Front Cover
        Front Cover
    List of Tables
        List of Tables
    Summary
        Page 1
        Page 2
        Page 3
        Page 4
    Table 1: Monthly precipitation
        Page 5
        Page 6
    Table 2: Pobability of receiving 0.01 inch or more of precipitation
        Page 7
    Table 3: Average size of storm
        Page 8
    Table 4: Daily average maximum temperature
        Page 9
    Table 5: Daily average minimum temperature
        Page 10
    Table 6: Daily average mean temperature
        Page 11
    Table 7: Extreme daily maximum temperature
        Page 12
    Table 8: Extreme daily minimum temperature
        Page 13
    Table 9: Date of occurrence of first and last snowfalls
        Page 14
    Table 10: Frost dates and length of growing period
        Page 15
        Page 16
    Table 11: Summary of meteorological data
        Page 17
Full Text

8~CO'I


Meteorological Data

1887-1957


A summary of 71 years
of meteorological data at the
Colorado Agricultural Experiment Station
Fort Collins, Colorado










Bulletin 509-S
Agricultural Experiment Station
HColorado State University
Fort Collins









LIST OF TABLES


Monthly precipitation ------
Probability of receiving 0.01 inch or more of
precipitation ----------------
Average size of storm ----------------------------
Daily average maximum temperature -----------
Daily average minimum temperature ---------
Daily average mean temperature ------------------
Extreme daily maximum temperature ---
Extreme daily minimum temperature ---------- .-
Date of occurence of first and last snowfalls-
Frost dates and length of growing period--
Summary of meteorological data-- ---


FORT COLLINS, COLORADO
3M 6-61


I.
II.


III.
IV.
V.
VI.
VII.
VIII.
IX.
x.
xI.


JUNE 1961












Meteorological Data 1887 to 1957




A summary of 71 years of meteorological data
at the Colorado Agricultural Experiment Station
Fort Collins, Colorado




By Maxwell Parshall*


Weather and climate are of
interest to almost everyone.
Weather is defined as the phys-
ical state of the atmosphere at"
any instant. It is continually
changing and is never exactly
the same at different times. Cli-
mate is the average weather at a
definite position on the earth's
surface. It tends to be the same
for like seasons of the year but
changes over a long period of
time. Climate is influenced by
geography. In the vicinity of
Fort Collins, climate changes
greatly within relatively short
distances. Within thirty air-
miles one can find arctic climate
in the high mountains, in con-
trast to the local semi-arid cli-
mate.
Weather observations for the
study of climate were first made
at the Colorado Agricultural Ex-


periment Station in the early
1870's by several professors at
the university and also by an in-
terested private citizen. Records
were not continuous or complete
but are on file at this station.
The precipitation was of most
interest because the Fort Collins
area is semi-arid and agricultural.
The Colorado Meteorological
Association was organized with
scattered volunteer members in
1886 in the interest of public
welfare. The first bulletin of the
Association was issued by F. H.
Loud, Director of Observations,
Colorado College Meteorological
Observatory, Colorado Springs,
Colorado, in May 1886, for the
data of April 1886. The Colo-
rado General Assembly passed an
act effective July 1, 1889, creat-
ing the Colorado Weather Serv-
ice, under the authority of the


* Meteorologist, Colorado Agricultural Experiment Station.


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State Board of Agriculture.
Monthly bulletins were issued at
Colorado Springs in cooperation
with the United States Signal
Service.
Later the bulletins were com-
piled and distributed from a
central office in Denver, Colo-
rado. The May 1891 bulletin
of the Colorado Weather Service
was issued in cooperation with
the United States Weather Bu-
reau, then under the Department
of Agriculture. Later the bulle-
tin appeared as Climatological
Data, Colorado Section, compiled
by the United States Weather
Bureau, now under the Depart-
ment of Commerce.
The Colorado Agricultural Ex-
periment Station set up exten-
sive weather instruments in 1887,
including an evaporation tank.
This work was under the direc-
tion of Professor L. G. Carpen-
ter. Facilities for making airway
observations were added to the
st ;-ion in 1937. Observers were:
R. E. Trimble, 1887-1936; Harry
Caperton, 1937; and Maxwell
Parslall, 1937-51. Observations
since 1951 have been made by
several students under the direc-
tion of Mr. Parshall.
The weather instruments have
occupied three different locations
on the Colorado State University
campus. From 1887 to 1910 they
were west of the Old Main Build-
ing and just west of the railroad
tracks. From 1910 to 1940 they


were south of the old Civil Engi-
neering Building located on the
southwest comer of the campus
"oval." At present they are
southwest from the Hydraulics
Laboratory in a new building
shown on the front cover of this
bulletin. The present location
is 40 35' N. latitude, 105 04'
W. longitude, with the barometer
at an altitude of 5,004 feet above
mean sea level.
Weather elements observed
are: maximum, minimum and
current air temperature; terres-
trial radiation air temperature*;
soil temperatures at depths of 3
inches, 6 inches, 12 inches, 24
inches, 36 inches, and 72 inches;
wet and dry bulb air tempera-
tures from a psychrometer; baro-
metric pressure; wind direction;
daily wind movement in miles;
precipitation, kind, amount and
time of duration; cloud cover;
dew and frost.
Evaporation is measured in
inches of depth from a steel tank
three feet square and three feet
deep buried in the ground. An
exposed rim about three inches
high is surrounded by grass on
two sides and concrete on the
other sides. Wind movement in
miles at about fifteen inches
above the water surface, and max-
imum, minimum and current
water temperatures are observed.
Instruments make records of air
temperature, barometric pres-
sure, wind direction, wind veloc-


Terrestrial radiation is defined as the difference in degrees Fahrenheit be-
tween the minimum temperatures observed in the instrument shelter and 6 inches
above ground surface.


-2-









ity, sunshine and precipitation.
The sunshine record, which is an
attempt to keep a record of dura-
tion and time of sunshine, is not
satisfactory. Soil temperatures
are read twice daily, 7 a.m. and
7 p.m., from mercurial thermom-
eters.
The instruments used are for
the most part of standard design
and are approved by the United
States Weather Bureau. Ther-
mometers are occasionally


Table


checked against a standard ther-
mometer. The instrument shelter
is kept well painted with white
paint, and weeds and grass are
cut during the summer to keep
an average height of two to three
inches. Additional data about
the instruments are available in
earlier versions of this bulletin;
a list follows.
The data taken at this station
are summarized in the following
tables:


TITLE


I Monthly Precipitation in Inches, Colorado Agricultural Experiment
Station, Fort Collins, Colorado
II Probability of Receiving 0.01 Inch or More of Precipitation at Colo-
rado Agricultural Experiment Station, Fort Collins, Colorado,
1887-1957
III Daily Average Maximum Temperature in Degrees Fahrenheit at
Colorado Agricultural Experiment Station, Fort Collins, Colorado,
1887-1957
IV Daily Average Minimum Temperature in Degrees Fahrenheit at Colo-
rado Agricultural Experiment Station, Fort Collins, Colorado,
1887-1957
V Daily Average Mean Temperature in Degrees Fahrenheit at Colo-
rado Agricultural Experiment Station, Fort Collins, Colorado,
1887-1957
VI Extreme Daily Maximum Temperature in Degrees Fahrenheit at
Colorado Agricultural Experiment Station, Fort Collins, Colorado,
1887-1957
VII Extreme Daily Minimum Temperature in Degrees Fahrenheit at
Colorado Agricultural Experiment Station, Fort Collins, Colorado,
1887-1957
VIII Dates of Occurrence of First and Last Snowfalls at Colorado Agricul-
tural Experiment Station, Fort Collins, Colorado, 1888-1957
IX Frost Dates and Length of Growing Period at Colorado Agricultural
Experiment Station, Fort Collins, Colorado, 1889-1957
X Summary of Meteorological Data at Colorado Agricultural Experi-
ment Station, Fort Collins, Colorado, 1887-1957


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Earlier summaries of meteorological data for the Colorado
Agricultural Experiment Station Weather Station were published
under the following titles:*


1. Meteorology of 1897, with Illustrations, by L. G. Carpenter and R. E.
Trimble, Colorado Agricultural Experiment Station Bulletin No. 49,
Fort Collins, Colorado, September 1898.
2. Meteorological Observations 1902, by L. G. Carpenter and R. E.
rimble, Colorado Agricultural Experiment Station, Fort Collins,
Colorado, 1903.
3. Climate of Colorado Temperature 21 Years' Record at Fort Collins, by
L. G. Carpenter and R. E. Trimble, Colorado Agricultural Experiment
Station Bulletin No. 127, Fort Collins, Colorado, January 1908.
4. Colorado Climatology, by R. E. Trimble, Colorado Agricultural Experi-
ment Station Bulletin No. 182, Fort Collins, Colorado, April 1912.
5. Colorado Climatology, by R. E. Trimble, Colorado Agricultural Experi-
ment Station Bulletin No. 245, Fort Collins, Colorado, June 1918.
6. The Climate of Colorado, A Forty-One Year Record, by R. E. Trimble,
Colorado Agricultural Experiment Station Bulletin No. 340, Fort
Collins, Colorado, December 1928.
7. Analysis of Fifty Years' Record of Meteorological Data Taken at the
Colorado Experiment Station, Fort Collins, Colorado, by Maxwell
Parshall, Colorado Agricultural Experiment Station Bulletin No. 456,
Fort Collins, Colorado, October 1939.
8. Summary of Meteorological Data at Colorado Agricultural Experiment
Station, Fort Collins, Colorado, from 1887 to 1947, by Maxwell
Parshall, Colorado Agricultural Experiment Station and Extension
Service Bulletin No. 402A, Fort Collins, Colorado, June 1948.













All are now out of print.


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TABLE I. Monthly precipitation in inches, Colorado Agricultural Experiment Station,
Fort Collins, Colorado.


Year Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec. Ann'l


In. In. In. In. In. In. In. In.


0.25 0.16 0.00 1.20 2.30 1.50 1.30 0.85
0.06 0.43 1.29 0.77 2.95 0.65 3.15 0.25





0.72 1.09 0.38 0.94 0.60 0.86 1.80 0.37
1.10 0.55 1.45 -
- 0.17 4.67 3.07 1.76 0.89
1.00 1.50 0.68 2.51 3.18 1.78
1.10 0.70 1.15 3.94 4.84 -
1.77 -
1.77 -

0.86 0.23 0.45 1.10 1.23 1.96 3.05 2.12
0.29 0.36 0.73 1.23 3.39 0.47 0.60 1.01
0.21 0.34 0.65 2.07 3.39 2.06 0.79 0.95
0.13 0.21 0.22 3.92 1.19 0.12 1.27 3.14
2.32 0.15 1.21 2.14 4.07 1.30 0.17 2.06
0.60 1.29 1.52 1.60 4.83 2.42 1.32 0.22
0.02 0.54 0.14 1.66 1.92 0.26 0.64 0.92
0.25 0.60 0.67 0.89 3.09 0.42 1.72 1.53
0.24 1.52 0.54 1.36 3.62 3.65 3.75 1.45
0.43 0.03 1.73 1.26 1.68 3.05 3.05 2.20
0.18 0.54 2.15 1.39 2.06 1.69 2.65 1.74
0.14 0.08 0.50 1.08 3.65 1.37 0.50 0.98
0.66 1.04 1.50 1.10 1.01 1.03 4.95 0.99


0.25 1.12 1.07 10.56 1.75
0.19 0.38 1.88 3.62 7.47
0.32 0.15 1.50 0.61 2.13
0.16 1.60 1.03 1.50 0.63
0.04 0.34 0.51 0.89 5.37
0.29 0.35 1.75 6.32 4.13
0.01 0.03 2.44 4.30 2.40
0.23 0.36 0.69 2.80 2.44
0.11 0.03 0.28 0.05 5.83
0.02 0.90 3.35 1.34 1.06
0.29 0.16 0.06 0.42 4.75
0.34 1.52 0.05 1.89 0.72
0.37 1.65 1.79 0.90 2.84
0.30 0.94 0.20 1.49 2.09
0.35 0.30 0.87 3.23 2.73
0.12 1.41 1.73 4.01 3.78
0.84 0.11 0.31 0.86 3.85
0.40 1.04 0.99 1.22 5.86
0.41 1.05 0.14 3.72 2.95
0.00 0.30 1.65 0.93 0.45
0.54 0.64 0.14 3.60 1.95
0.96 0.19 0.13 1.71 1.97
0.35 0.53 0.36 2.80 0.87
0.19 1.39 2.74 2.18 4.46
0.51 0.54 1.83 0.93 3.90
0.27 0.09 0.58 0.10 1.18.


0.82 1.14 0.16
2.35 0.71 0.72
2.43 1.31 0.67
2.23 1.06 0.86
1.68 1.99 0.71
0.64 2.18 1.25
1.80 1.96 0.80
0.44 2.28 1.27
1.16 3.66 2.12
2.59 1.98 1.45
1.04 0.87 1.92
1.78 1.47 0.59
2.43 2.93 1.26
0.15 2.63 0.41
2.01 1.68 1.27
1.90 2.12 1.56
0.60 0.65 0.71
0.03 1.19 1.21
1.18 4.83 1.91
0.19 0.64 0.61
0.60 0.58 1.72
3.66 1.40 2.55
1.03 0.80 0.73
6.23 4.50 0.62
0.22 0.21 0.05
1.50 1.85 1.32


1926 0.25 0.28 1.54 2.99 1.76 1.58 0.93 0.86


In. In. In. In.

0.02 0.20
0.75 0.42 0.20 0.17
0.00 1.00 0.02 0.00




- 1.75 0.15 0.60
1.47 2.07 1.10 0.10

2.51 0.82 0.29 -
1.00 1.29 Tr. 1.33
0.10 1.80 0.35

0.69 1.18 0.33
0.54 0.43 0.15 0.00
0.29 0.88 0.38 0.16
0.42 3.16 0.42 0.02
0.07 0.70 0.32 0.12
1.02 0.20 0.60 0.46
0.14 0.93 0.23 0."
0.18 0.16 0.55 0.1.
2.29 0.00 0.14 0.76
0.47 1.06 0.40 0.01
1.55 0.49 0.05 0.24
0.75 0.75 0.67 0.67
0.50 0.82 1.24 0.17
0.21 3.23 0.00 0.47
1.92 0.24 0.07 0.11
2.10 0.36 0.02 1.37
7.12 1.15 0.27 0.77
0.87 1.70 0.18 0.07
1.09 0.39 0.00 0.12
0.28 2.60 0.07 0.00
3.08 1.59 1.35 0.12
0.58 0.08 0.44 0.03
0.54 1.78 1.06 0.60
2.10 0.08 0.79 0.58
1.79 1.03 0.11 0.48
0.80 0.93 0.43 0.37
2.66 2.03 0.59 0.21
2.39 1.00 0.17 4.08
0.02 1.58 0.12 0.15
2.97 1.97 0.10 0.82
0.70 2.92 0.98 0.62
0.45 0.62 0.40 0.31
3.23 0.71 0.90 0.76
2.61 1.93 1.22 0.39
0.60 0.50 0.24 0.54
0.68 0.37 0.32 0.89
0.02 0.74 1.44 0.31
1.36 3.55 0.10 0.25
0.84 0.78 0.09 0.74
1.96 3.26 0.89 1.50
1.03 1.15 0.36 0.83


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Table 1-Continued.

Year Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec. Ann'1

In. In. In. In. In. In. In. In. In. In. In. In.


0.04 0.40 1.87
0.26 0.52 1.38
0.21 0.70 1.78
0.45 0.07 0.70
0.00 1.26 0.41
0.08 0.48 1.09
0.16 0.13 0.60
0.01 1.11 0.71
0.07 0.89 0.21
0.04 0.39 0.71
0.36 0.53 1.14
0.42 0.27 1.32
0.41 0.60 1.60
1.07 0.54 0.72
0.58 0.04 1.16
0.32 0.88 0.20
0.22 0.48 0.71
0.45 0.35 2.01
0.73 0.34 0.42
0.13 0.10 0.78
0.42 0.89 0.95
1.01 0.70. 0.68
0.37 0.11 1.96
0.36 0.17 0.36
0.73 0.70 0.35
0.07 0.08 1.57
0.19 0.49 1.05
0.11 0.06 0.90
0.36 0.63 1.15
0.70 0.66 0.71
0.70 0.52 0.43


2.69 0.91 2.17 2.19 2.10 1.10 1.05 1.00 0.25 15.77
0.98 3.35 2.73 0.83 0.69 0.09 1.50 1.15 0.06 13.54
2.37 1.08 0.64 0.46 2.35 2.13 0.99 0.93 0.09 13.73
0.56 4.08 1.50 1.00 5.45 0.16 0.36 0.70 0.14 15.17
1.07 2.55 1.50 0.10 0.78 0.40 1.00 0.63 0.18 9.88
0.88 2.14 1.11 2.15 3.68 0.01 0.34 0.34 0.49 12.79
1.91 4.56 0.05 0.71 4.34 2.10 0.00 0.06 1.03 15.65
1.41 1.92 1.25 1.33 0.28 0.79 0.00 0.06 0.00 8.87
1.24 6.71 0.62 1.14 0.50 3.29 0.62 0.66 0.00 15.95
1.17 1.10 2.90 0.95 1.46 1.11 1.38 0.18 0.38 11.77
2.23 1.48 1.94 1.18 0.63 0.09 0.71 0.56 1.52 12.37
2.47 2.70 1.81 0.93 0.47 7.34 0.72 0.54 0.76 19.75
1.42 1.56 0.43 Tr. 1.01 0.15 0.40 0.03 0.24 7.85
1.39 1.83 0.24 1.10 0.32 5.33 0.46 0.59 0.15 13.74
3.49 2.01 1.87 0.90 4.19 1.28 1.33 0.18 0.68 17.71
5.50 2.26 2.37 0.34 1.48 0.75 6.70 0.50 Tr. 21.30
1.45 5.95 1.06 0.93 0.56 0.10 0.29 0.33 0.19 12.27
4.10 1.98 1.23 2.25 0.09 0.19 0.14 0.13 0.21 13.13
3.02 1.88 2.83 0.44 3.55 1.31 0.80 0.15 0.26 15.73
0.43 2.68 1.32- 2.93 1.68 0.78 1.23 1.98 0.07 14.11
1.41 3.62 4.48 0.80 0.55 0.50 2.64 0.88 0.81 17.95
0.67 2.16 1.88 0.36 0.75 0.20 0.72 0.38 0.94 10.45
1.53 2.94 6.31 3.13 0.74 0.42 1.24 Tr. 0.06 18.81
2.00 3.91 1.33 1.50 0.60 1.70 0.31 0.50 0.08 12.82
1.39 2.59 2.11 1.97 7.39 0.96 2.73 0.66 1.00 22.58
1.89 3.71 2.46 0.72 0.98 0.04 0.20 1.03 Tr. 12.75
1.87 1.88 2.79 1.23 0.65 0.48 0.12 0.45 0.22 11.42
0.35 1.17 0.89 0.95 1.24 0.99 0.35 0.53 0.47 8.01
0.22 1.64 2.58 1.23 1.42 1.91 0.19 1.05 0.59 12.97
1.67 2.62 0.31 2.23 1.91 0.03 0.05 0.79 0.51 12.19
3.94 6.04 1.02 0.43 3.07 0.81 1.99 0.62 Tr. 19.57


1887-1957
Mean 0.36 0.56 1.00 2.01 2.81 1.66 1.53 1.45 1.25 1.10 0.50 0.45 14.68

Extremes
Max. 2.32 1.65 3.35 10.56 7.47 6.31 4.95 7.39 7.34 6.70 1.98 4.08 27.57
Min. 0.00 0.03 0.05 0.05 0.45 0.03 Tr. 0.05 0.01 0.00 0.00 0.00 7.11


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TABLE II. Probability of receiving 0.01 inch or more of precipitation at Colorado
Agricultural Experiment Station, Fort Collins, Colorado, based on records from 1887 to 195';.'

Day Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. D. .


1 0.188
2 0.145
3 0.203
4 0.174
5 0.159
6 0.130
7 0.174
8 0.203
9 0.217
10 0.174
11 0.203
12 0.159
13 0.087
14 0.130
15 0.203
16 0.261
17 0.261
18 0.159
19 0.188
20 0.246
21 0.217
22 0.159
23 0.203
24 0.232
25 0.145
26 0.261
27 0.261
28 0.203
29 0.217
30 0.174
31 0.290


0.232 0.464 0.406 0.391 0.435
0.348 0.536 0.449 0.391 0.436
0.377 0.478 0.536 0.522 0.565
0.304 0.449 0.464 0.362 0.536
0.319 0.420 0.493 0.449 0.449
0.333 0.449' 0.478 0.348 0.449
0.391 0.507 0.478 0.507 0.493
0.406 0.478 0.464 0.421 0.507
0.391 0.406 0.536 0.319 0.421
0.348 0.493 0.362 0.478 0.507
0.348 0.522 0.421 0.449 0.348
0.319 0.478 0.362 0.406 0.522
0.319 0.478 0.348 0.493 0.464
0.406 0.478 0.421 0.435 0.333
0.435 0.493 0.493 0.464 0.421
0.333 0.478 0.421 0.406 0.421
0.319 0.377 0.478 0.478 0.391
0.362 0.435 0.435 0.449 0.406
0.348 0.522 0.261 0.435 0.536
0.319 0.551 0.391 0.464 0.536
0.348 0.435 0.406 0.478 0.391
0.348 0.449 0.290 0.377 0.435
0.478 0.449 0.333 0.421 0.362
0.449 0.464 0.421 0.478 0.391
0.536 0.536 0.406 0.406 0.493
0.377 0.522 0.333 0.464 -0.377
0.319 0.566 0.290 0.478 0.464
0.420 0.435 0.319 0.478 0.449
0.522 0.507 0.391 0.435 0.435
0.522 0.493 0.507 0.478 0.319
0.580 0.435 0.319


*Probability in percent can be obtained by multiplying all figures in the tabulation by 100.


0.421 0.206 0.275 0.206
0.304 0.261 0.218 0.261
0.333 0.275 0.218 0.206
0.333 0.246 0.232 0.232
0.319 0.246 0.130 0.174
0.304 0.261 0.188 0.261
0.333 0.206 0.246 0.188
0.449 0.232 0.188 0.232
0.349 0.304 0.188 0.206
0.349 0.188 0.188 0.188
0.362 0.246 0.232 0.145
0.246 0.246 0.159 0.206
0.349 0.290 0.145 0.218
0.304 0.246 0.102 0.206
0.218 0.261 0.130 0.102
0.145 0.333 0.159 0.159
0.188 0.206 0.218 0.218
0.290 0.261 0.206 0.130
0.319 0.206 0.188 0.159
0.232 0.188 0.188 0.145
0.232 0.232 0.206 0.232
0.261 0.275 0.188 0.145
0.188 0.218 0.206 0.174
0.304 0.261 0.188 0.206
0.261 0.246 0.174 0.130
0.333 0.188 0.145 0.218
0.188 0.145 0.246 0.130
0.188 0.206 0.218 0.130
0.275 0.290 0.130 0.174
0.377 0.246 0.116 0.188
0.188 0.188


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TABLE III. Average size of storm, in inches, at Colorado Agricultural Experiment
Station, Fort Collins, Colorado, 1887 to 1957.

Day Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec.

In. In. In. In. In. In. In. In. In. In. In. In.
1 0.027 0.042 0.085 0.180 0.098 0.080 0.064 0.123 0.063 0.164 0.052 0.170
2 0.046 0.056 0.065 0.257 0.248 0.212 0.077 0.138 0.241 0.067 0.125 0.126
3 0.048 0.094 0.063 0.095 0.155 0.240 0.093 0.230 0.272 0.075 0.089 0.122
4 0.038 0.112 0.085 0.117 0.142 0.392 0.129 0.168 0.154 0.162 0.109 0.129
5 0.072 0.028 0.046 0.137 0.202 0.190 0.119 0.108 0.100 0.183 0.061 0.079
6 0.107 0.053 0.044 0.090 0.119 0.114 0.049 0.132 0.147 0.105 0.079 0.048
7 0.117 0.053 0.118 0.200 0.167 0.171 0.047 0.099 0.099 0.107 0.059 0.081
8 0.136 0.070 0.148 0.105 0.164 0.117 0.252 0.119 0.114 0.081 0.161 0.093
9 0.065 0.066 0.089 0.194 0.206 0.185 0.102 0.071 0.158 0.159 0.115 0.065
10 0.028 0.112 0.100 0.218 0.249 0.118 0.064 0.076 0.165 0.105 0.071 0.051
11 0.061 0.051 0.139 0.263 0.142 0.117 0.163 0.125 0.126 0.116 0.155 0.087
12 0.033 0.080 0.100 0.097 0.149 0.111 0.115 0.138 0.081 0.177 0.117 0.049
13 0.082 0.065 0.070 0.110 0.198 0.155 0.131 0.155 0.127 0.182 0.077 0.226
14 0.014 0.066 0.148 0.248 0.154 0.152 0.075 0.161 0.162 0.143 0.084 0.106
15 0.064 0.087 0.234 0.184 0.176 0.232 0.127 0.104 0.151 0.318 0.089 0.041
16 0.043 0.049 0.149 0.131 0.223 0.097 0.108 0.116 0.179 0.217 0.033 0.057
17 0.052 0.070 0.044 0.258 0.165 0.098 0.046 0.125 0.045 0.186 0.149 0.051
18 0.054 0.048 0.129 0.228 0.256 0.058 0.106 0.091 0.090 0.142 0.092 0.032
19 0.037 0.053 0.151 0.230 0.117 0.073 0.173 0.085 0.112 0.189 0.105 0.034
20 0.018 0.055 0.100 0.205 0.286 0.088 0.135 0.085 0.227 0.138 0.069 0.079
21 0.067 0.111 0.234 0.172 0.313 0.129 0.059 0.087 0.557 0.175 0.066 0.040
22 0.014 0.061 0.053 0.147 0.193 0.080 0.132 0.063 0.195 0.095 0.116 0.117
23 0.014 0.048 0.079 0.169 0.221 0.096 0.102 0.071 0.151 0.267 0.024 0.105
24 0.064 0.104 0.206 0.240 0.229 0.096 0.105 0.042 0.145 0.166 0.062 0.039
25 0.099 0.096 0.132 0.134 0.175 0.119 0.102 0.049 0.138 0.102 0.089 0.067
26 0.103 0.076 0.092 0.242 0.122 0.048 0.148 0.095 0.152 0.058 0.066 0.044
27 0.045 0.145 0.099 0.199 0.175 0.139 0.133 0.096 0.168 0.069 0.084 0.046
28 0.107 0.133 0.087 0.172 0.198 0.119 0.048 0.080 0.124 0.052 0.085 0.011
29 0.097 0.132 0.236 0.124 0.049 0.174 0.059 0.110 0.260 0.224 0.064
30 0.084 0.168 0.162 0.247 0.041 0.175 0.083 0.170 0.138 0.061 0.113
31 0.024 0.084 0.248 0.121 0.055 0.179 0.040


-8-











TABLE IV. Daily average maximum temperature in degrees Fahrenheit at Colorado
Agricultural Experiment Station, Fort Collins, Colorado, 1887 to 1957.

Day Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec.


-9-












TABLE V. Daily average minimum temperature in degrees Fahrenheit at Colorado
Agricultural Experiment Station, Fort Collins, Colorado, 1887 to 1957.


Day Jan. Feb. Mar. Apr. May


June July Aug. Sept. Oct. Nov. Dec.


F. F.
1 10.3 9.4
2 10.2 11.1
3 13.1 13.3
4 12.9 11.3
5 13.7 13.6
6 12.1 13.5
7 9.6 12.5
8 10.5 12.1
9 12.6 12.4
10 11.3 13.3
11 10.9 13.5
12 10.2 14.0
13 11.0 14.8
14 14.0 13.8
15 12.8 13.9
16 11.4 14.7
17 11.3 16.6
18 11.2 16.2
19 12.9 15.2
20 10.9 15.4
21 11.0 16.4
22 12.3 16.9
23 12.2 17.4
24 13.9 17.0
25 14.1 17.9
26 12.7 16.8
27 11.6 16.6
28 11.8 16.9
29 12.2
30 11.2
31 11.5


*F. F. F. F. F. F. "F.
16.7 27.6 35.9 45.8 52.7 54.5 49.4
18.2 27.5 36.9 45.6 52.7 54.9 48.0
19.5 27.8 36.4 45.7 52.3 54.6 49.2
19.9 27.7 36.6 46.0 52.5 55.0 47.9
19.4 29.0 39.1 45.8 52.9 55.0 47.3
18.5 29.1 37.6 46.3 53.0 54.6 47.4
19.1 30.2 38.2 46.8 54.1 53.7 48.0
20.5 29.5 39.0 47.8 53.7 53.8 47.9
22.1 30.1 38.9 47.5 53.4 53.8 47.1
22.0 30.8 38.9 47.2 54.2 53.7 44.7
21.0 30.0 38.7 48.7 54.7 54.3 45.7
21.0 29.4 38.9 47.7 55.0 53.4 44.3
20.8 31.3 38.8 48.4 55.3 53.7 45.0
22.1 32.1 39.4 49.2 55.3 54.0 44.4
20.4 32.6 40.7 49.3 55.0 54.2 43.7
21.7 32.1 41.1 48.7 55.1 53.3 43.1
23.7 31.7 40.5 48.8 55.4 52.8 43.1
23.3 32.7 41.9 48.7 54.8 53.3 43.4
23.5 33.5 41.6 49.2 54.6 52.9 42.6
24.1 32.4 42.0 50.5 54.2 51.8 41.2
24.3 33.0 42.7 50.9 54.2 51.3 40.8
24.3 34.9 41.8 49.9 53.9 51.2 41.1
25.0 35.8 43.2 50.3 55.2 51.3 41.6
25.2 35.4 44.8 51.5 55.3 51.0 41.3
23.8 34.3 43.8 51.6 55.1 50.8 40.0
23.2 35.1 44.3 52.4 55.0 50.6 39.2
23.8 35.9 45.1 51.5 56.0 51.1 37.6
24.3 36.6 45.0 52.0 55.4 51.3 39.3
26.7 36.3 44.7 52.9 55.3 50.0 39.4
25.2 36.4 45.2 53.2 55.6 50.4 39.8
25.5 46.4 55.1 49.8


-10-


CF. F.
39.9 27.3
38.9 23.8
39.3 24.8
38.3 26.0
36.4 24.8
36.7 25.0
35.3 26.4
35.6 22.8
35.4 21.8
35.6 21.7
34.6 20.8
34.3 20.7
34.7 21.4
34.2 20.6
34.6 21.5
32.9 20.7
33.0 21.7
32.4 21.7
30.4 20.7
31.4 20.8
30.0 20.2
31.5 18.2
29.4 19.7
28.9 19.8
30.0 21.5
28.9 18.4
28.6 19.6
29.1 19.2
27.6 17.3
27.4 18.6
25.9


_












TABLE VI. Daily average mean* temperature in degrees Fahrenheit at Colorado Agri-
cultural Experiment Station, Fort Collins, Colorado, 1887 to 1957.

Day Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec.


F. "F. 'F. F. F. F. F. F. F. F. F. F.
1 24.7 24.0 30,5 42.0 49.9 58.4 67.8 69.8 65.6 56.0 41.4 32.9
2 24.4 26.4 32.5 42.2 50.2 59.2 68.0 69.7 64.2 55.0 38.8 32.5
3 26.7 26.7 32.3 41.3 49.6 58.7 67.6 69.8 64.4 54.6 40.2 31.9
4 26.9 26.0 32.5 42.3 51.3 58.8 68.2 69.8 63.7 53.3 41.3 31.9
5 27.6 28.3 31.8 43.5 52.6 59.8 68.8 69.7 63.7 52.2 40.5 31.9
6 25.7 27.5 32.3 43.5 51.4 59.9. 68.9 69.1 63.5 51.6 39.5 31.0
7 24.5 27.3 33.2 43.4 52.2 61.0 69.0 68.9 63.4 51.4 39.4 29.8
8 26.2 26.2 35.5 43.1 52.4 61.4 68.8 69.2 62.5 51.4 37.7 28.3
9 27.1 26.4 35.8 44.3 53.0 61.4 68.8 68.7 61.8 51.6 37.3 27.9
10 26.1 27.7 34.8 45.1 51.8 62.0 69.5 68.8 60.4 51.9 37.8 29.3
11 24.6 28.4 35.3 44.0 52.5 63.2 69.9 68.6 60.4 50.0 35.6 29.5
12 24.8 28.7 35.2 44.0 52.5 62.6 69.9 69.1 60.6 50.0 35.6 29.8
13 26.2 28.5 34.6 46.0 52.6 63.5 70.2 69.0 60.8 50.4 36.4 28.0
14 28.1 27.6 34.6 46.8 53.8 63.7 70.1 69.1 60.2 50.1 36.5 26.9
15 26.1 28.4 34.0 45.7 54.4 63.7 70.2 69.6 59.4 50.2 36.3 27.2
16 25.2 30.1 36.6 46.4 54.0 63.8 70.2 68.6 59.5 48.5 35.2 28.3
17 24.9 30.2 37.7 46.1 55.3 64.6 69.8 68.2 60.2 48.5 36.2 26.9
18 26.2 29.9 38.2 46.6 56.0 64.3 69.3 68.2 60.0 48.0 35.7 26.9
19 26.8 28.6 37.8 47.0 55.7 65.0 69.3 67.6 59.1 46.3 35.2 27.3
20 25.0 29.2 38.0 47.5 55.3 65.4 69.7 66.6 58.2 46.7 35.8 28.5
21 25.6 29.8 37.7 48.1 55.8 65.8 69.1 66.7 57.5 46.5 34.1 27.4
22 27.1 30.4 38.1 49.5 56.0 65.7 69.1 66.6 57.9 46.3 32.6 28.7
23 26.8 30.8 39.2 48.7 57.0 66.5 70.0 66.6 57.5 44.9 34.1 28.3
24 27.6 30.5 39.0 48.0 58.0 66.8 69.8 66.7 57.0 45.4 35.1 27.6
25 27.3 31.0 37.5 48.0 57.6 66.8 70.2 66.5 55.6 45.3 35.0 26.5
26 26.4 30.3 36.2 49.3 57.6 67.7 70.8 66.5 54.6 44.5 33.1 26.6
27 26.4 30.4 37.6 49.8 57.4 68.0 70.7 66.2 54.6 44.8 32.7 25.8
28 26.7 30.6 38.5 50.1 57.9 68.2 70.1 66.2 54.9 44.6 33.1 27.7
29 26.7 [31.3] 40.3 49.1 58.2 68.0 70.0 65.7 55.1 42.7 32.2 27.7
30 25.3 39.0 49.4 58.7 68.5 69.8 66.2 55.8 42.1 33.6 26.3
31 25.5 39.2 58.6 69.8 66.0 41.7 24.4


*Mean temperature = V (Daily Maximum Temperature + Daily Minimum Temperature)


-11 -












TABLE VII. Extreme daily maximum temperature in degrees Fahrenheit at Colorado
Agricultural Experiment Station, Fort Collins, Colorado, 1887-1957.*

Day Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec.


oF.
86.0

83.7
84.7
84.6
88.3
86.0

85.3
90.0
(1895)
87.8
86.0
87.8


oF. F.
64.6 65.0

62.7 71.9
66.3 69.7
67.3 67.8
67.8 66.7
61.7 62.2

60.5 64.6
66.1 75.2
(1954)
66.0 72.8
67.0 69.6
66.0 70.0

67.7 68.0

64.2 69.3
65.0 68.0
63.2 62.3
63.3 66.0

63.2 65.0
64.0 63.9

69.0 66.2
60.6 65.0
68.0 67.0

64.2 67.8
62.6 65.8

64.9 66.1
68.0 69.7
71.0 71.2
(1888)
70.0 74.2
69.0 73.0
67.0 [69.5]
70.0
68.0


*Year of occurrence of highest temperature for the month is given in parentheses.


-12-


oF. 'F.
71.0 75.2

71.0 77.0
72.6 74.0
70.7 78.0
76.1 74.0
67.0 80.4

72.4 83.0
68.9 79.9

71.1 76.4
76.9 80.0
76.0 79.0

74.9 80.2

74.0 84.0
76.2 84.0
72.0 83.0
75.7 82.0

80.0 83.0
81.0 82.0
(1921)
79.3 79.3
80.3 86.0
78.8 91.0
(1888)
79.9 87.0
71.0 83.0

75.8 83.0
76.2 81.9
73.0 86.2

80.2 85.2
74.0 86.4
76.9 82.0
78.3 82.7
80.0


oF.
90.9

90.4
89.9
90.4
92.0
92.0

93.2
88.4

94.2
94.8
95.6

95.9

96.3
94.3
94.3
95.1

96.0
99.8

94.0
93.4
95.2

95.2
102.3
(1954)
98.3
96.0
94.9

94.0
97.2
96.9
96.0


oF.
95.0

96.6
94.4
95.4
97.2
97.0

97.0
95.0

95.2
100.7
101.9

102.2
(1954)
99.8
97.3
101.7
98.0

96.0
98.1

97.2
100.5
96.0

97.4
97.0

96.3
97.0
99.9

96.8
96.2
96.7
94.8
97.0


F. oF.
99.6 95.0
(1902)
98.2 93.3
99.2 93.8
96.6 94.1
94.0 94.6
97.0 92.1

97.0 91.9
97.3 90.0

94.1 92.1
93.6 92.0
93.4 91.8

93.4 90.8

94.5 94.0
95.5 93.0
96.4 91.6
97.0 95.0
(1895)
95.0 93.5
93.2 93.7

94.7 87.3
93.1 93.5
95.6 88.1

94.9 88.3
94.4 90.5

94.0 85.7
93.5 90.0
94.0 87.9

93.0 90.0
95.2 87.1
95.6 89.3
94.4 88.9
93.5


oF. F. F.
88.0 78.0 67.0
(1887)
84.6 77.0 67.2
84.2 75.7 65.5
86.8 77.0 69.1
85.0 74.9 65.8
85.3 79.1 71.4
(1934)
84.4 74.1 62.0
83.9 74.2 63.7

84.7 69.8 72.7
83.2 75.3 67.6
80.8 72.3 75.7
(1939)
84.3 75.0 64.1

81.1 71.8 65.3
81.0 74.0 70.0
80.2 75.0 66.6
80.8 74.6 66.9

88.0 73.7 69.2
81.9 72.6 58.4

78.5 75.6 65.0
79.8 70.8 64.7
82.8 71.2 66.1

76.6 67.7 68.9
79.8 67.0 69.5

80.7 67.0 67.5
77.3 71.9 63.7
78.6 65.8 66.0

78.8 71.0 64.3
78.9 75.4 66.8
76.9 69.5 65.2
76.8 71.8 62.9
78.6 65.7












TABLE VIII. Extreme daily minimum temperature in degrees Fahrenheit at Colorado
Agricultural Experiment Station, Fort Collins, Colorado, 1887 to 1957.*


Day Jan; Feb. Mar. Apr. May June July Aug. Sept.


'F. *F. F. F. 'F. *F. F. oF. 'F.
1 -24.0 -40.7 -20.1 7.2 19.2 30.8 40.7 43.0 35.8
(1951)
2 -27.9 -23.0 -18.5 -3.0 24.3 30.0 43.0 43.0 37.0
3 -23.3 -18.0 -18.2 8.0 23.0 30.3 41.0 44.9 34.3
4 -28.1 -31.4 -13.1 -10.4 23.4 35.1 36.0 46.1 36.8
(1945) (1903)
5 -29.9 -31.6 -10.2 8.0 27.8 31.3 41.7 45.0 33.5
6 -26.0 -38.3 -31.3 9.2 12.1 32.5 38.8 44.0 31.0
(1943) (1917)
7 -29.5 -32.0 -12.2 10.4 23.6 31.6 40.0 44.0 29.7
8 -25.8 -31.4 -7.2 -4.3 27.0 36.2 39.6 45.0 30.1
9 -23.0 -21.4 -27.5 11.6 24.2 34.5 43.0 46.0 28.0

10 -15.2 -31.6 -19.6 -0.6 25.0 35.0 44.0 45.9 31.0
11 -28.4 -29.7 -30.1 3.0 26.6 34.7 45.6 45.8 27.5
12 -16.2 -38.4 -24.4 -8.1 26.0 32.6 42.0 45.2 22.0
13 -22.3 -26.8 -11.1 11.6 28.0 28.8 44.0 44.3 27.1
(1947)
14 -16.0 -22.6 -8.8 7.6 22.3 37.6 47.2 45.8 26.1
15 -28.0 -28.0 -20.0 16.0 27.7 36.3 45.4 45.3 26.0
16 -17.0 -23.4 -4.8 20.4 26.1 31.2 44.2 38.3 28.0
17 -38.5 -18.0 -19.7 8.7 28.4 35.0 46.9 44.8 28.0
(1930)
18 -23.8 -20.9 -9.2 9.2 27.4 33.8 47.2 43.8 30.0
19 -26.6 -14.1 -24.6 15.8 27.0 33.0 43.0 43.2 30.4
20 -17.0 -14.0 -7.9 21.0 28.2 36.5 38.9 42.4 29.4
21 -32.2 -11.2 -12.1 5.7 29.2 38.8 44.8 40.2 27.4
22 -19.0 -17.3 -2.0 14.8 29.0 38.9 43.2 36.7 25.5
23 -14.1 -12.2 -10.2 20.1 29.2 38.6 46.9 37.6 27.0
24 -22.0 -11.3 2.5 21.8 33.0 38.8 46.4 39.7 28.8
25 -14.0 -12.6 1.7 21.1 33.7 39.6 45.0 31.7 20.1
(1910)(1926)
26 -31.4 -16.2 -4.8 13.4 32.7 40.2 45.0 33.2 22.4
27 -26.0 -20.0 -24.5 25.0 34.8 41.5 48.0 39.2 23.4
28 -31.8 -19.0 -16.7 21.0 31.3 39.8 45.0 40.1 25.3
29 -27.6 [-14.3] 4.0 20.3 25.2 41.0 45.3 33.9 23.0
30 -20.0 -7.5 5.7 32.2 42.0 43.0 34.5 26.5
31 -19.7 -9.0 33.4 42.5 36.0


Oct. Nov. Dec.


F. F. *F.
27.5 -0.5 2.6

24.6 -16.8 -5.1
29.5 8.6 -6.7
24.0 8.0 -15.0

15.7 1.0 -19.1
19.9 8.8 -11.8

22.2 5.1 -18.3
22.0 6.8 -10.8
16.3 -9.7 -35.2
(1919)
17.8 -15.9 -11.4
20.8 -7.3 -23.2
20.5 -110 -29.7
19.5 -21.1 -19.0
(1916)
19.8 -13.0 -21.2
17.4 1.1 -17.5
19.3 -4.1 -17.6
6.4 -6.2 -9.4

21.0 -10.0 -13.4
18.1 -4.0 -23.4
17.5 -9.3 -21.3
14.6 -3.0 -17.3
16.5 -9.4 -15.1
16.0 -12.8 -9.7
11.0 -7.8 -16.5
13.0 -3.8 -18.9

11.8 -12.0 -13.6
14.8 -14.0 -16.0
12.5 -14.4 -24.0
-7.4 -9.4 -8.2
4.2 -4.9 -14.0
-8.0 -22.3
(1905)


*Year of occurrence of lowest temperature for the month is given in parentheses.


-13-












TABLE IX. Date of occurrence of first and last snowfalls at Colorado Agricultural Ex-
periment Station, Fort Collins, Colorado, 1887 to 1957.

Fall Spring Year Fall Spring
Year (First) (Last) (First) (Last)


Nov. 4
Oct. 29
Nov. 8
Nov. 14
Dec. 6
Nov. 17
Nov. 16
Sept. 22
Oct. 28
Oct. 16
Oct. 19
Oct. 13
Oct. 20
Dec. 3
Nov. 15
Nov. 12
Oct. 24
Oct. 14
Oct. 20
Sept. 30
Oct. 18
Nov. 12
Nov. 15
Oct. 18
Sept. 14
Sept. 24
Nov. 16
Oct. 11
Oct. 18
Oct. 20
Oct. 30
Oct. 9
Oct. 22
Nov. 8
Oct. 16
Oct. 24


May 2
May 15
May 21
May 8
May 6
April 17
April 21
April 18
May 7
May 5
April 29
April 30
April 16
April 13
April 30
April 21
May 10
April 3
May 13
May 4
April 21
Feb. 20
April 30
May 13
April 25
April 18
May 6
May 15
May 5
May 11
April 14
April 26
April 25
April 17
April 23


1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957

Mean
Extreme


Nov. 6
Oct. 8
Oct. 23
Sept. 25
Oct. 29
Sept. 6
Oct. 15
Nov. 18
Oct. 9
Nov. 1
Sept. 20
Sept. 26
Sept. 26
Nov. 15
Oct. 18
Oct. 29
Nov. 10
Oct. 29
Sept. 18
Nov. 1
Nov. 24
Sept. 27
Oct. 7
Oct. 22
Oct. 16
Oct. 19
Nov. 2
Sept. 21
Oct. 6
Oct. 23
Oct. 14
Sept. 25
Oct. 29
Oct. 24

Oct. 22
Sept. 6
Dec. 6


April 25
Mar. 18
April 9
May 8
April 25
April 9
Mar. 31
May 21
April 28
May 10
May 13
May 3
April 5
June 4
May 5
April 16
April 17
April 19
May 3
May 9
May 7
April 17
May 19
June 12
April 11
May 6
May 26
June 2
April 22
May 12
May 2
April 12
April 24
May 16

April 29
Feb. 20
June 12


-14-












TABLE X. Frost dates and length of growing period at Colorado Agricultural Experi-
ment Station, Fort Collins, Colorado, 1889-1957.

Spring Fall


Day of
Year Date Year


1889
1890
1891
1892
1893

1894
1895
1896
1897
1898

1899
1900
1901
1902
1903

1904
1905
1906
1907
1908

1909
1910
1911
1912
1913

1914
1915
1916
1917
1918

1919
1920
1921
1922
1923

1924
1925
1926
1927
1928

1929
1930
1931
1932
1933

1934
1935


May 12
May 6
May 2
May 22
June 6

May II
June 20
May 20
June 3
May 7

June 7
May 19
May 26
June 3
May 31

May 17
May 29
May 9
June 1
May 29

May 25
May 22
May 22
May 14
May 15

May 7
June 7
June 7
June 13
May 13

June 3
May 26
May 3
June 1
May 16

May 15
May 5
May 14
May 30
May 5

May 6
May 23
May 22
May 16
May 15

May 15
May 7


Day of Growing
Date Year Period


Sept. 6
Sept. 8
Sept. 3
Aug. 30
Sept. 14

Sept. 14
Sept. 21
Sept. 26
Sept. 17
Sept. 7

Sept. 17
Sept. 18
Sept. 17
Sept. 19
Aug. 29

Aug. 22
Sept. 2
Oct. 5
Sept. 10
Sept. 27

Sept. 22
Aug. 25
Sept. 19
Sept. 14
Sept. 17

Sept. 14
Sept. 16
Sept. 12
Sept. 27
Sept. 16

Sept. 23
Sept. 26
Sept. 21
Oct. 7
Sept. 29

Sept. 19
Oct. 9
Sept. 24
Sept. 20
Sept. 21

Sept. 9
Sept. 26
Sept. 21
Oct. 4
Oct. 8

Sept. 16
Sept. 27


249
251
246
242
257

257
264
269
260
250

260
261
260
252
241

234
245
278
253
270

265
237
262
257
260

257
259
255
270
259

266
269
264
280
272

262
282
267
263
264

252
269
264
277
281

259
270


-15-












Table X--Continued.
Spring Fall

Day of Day of Growing
Year Date Year Date Year Period

1936 May 1 121 Sept. 27 270 149
1937 June 6 157 Oct. 5 278 121
1938 May 10 130 Oct. 11 284 154
1939 May 13 133 Sept. 30 273 140
1940 May 1 121 Oct. 7 280 159

1941 April 25 115 Sept. 9 252 137
1942 May 22 142 Sept. 19 262 120
1943 June 3 154 Sept. 6 249 95
1944 May 19 139 Sept. 12 255 116
1945 June 18 169 Sept. 13 256 87

1946 May 20 140 Sept. 20 263 123
1947 June 13 164 Sept. 15 258 94
1948 May 13 133 Oct. 2 275 142
1949 May 2 122 Sept. 13 256 134
1950 June 4 155 Sept. 26 269 114

1951 June 4 155 Sept. 12 255 100
1952 May 22 142 Sept. 23 266 124
1953 May 19 139 Sept. 21 264 125
1954 May 29 149 Sept. 21 264 115
1955 May 29 149 Sept. 25 268 119

1956 May 16 136 Sept. 23 266 130
1957 May 17 137 Sept. 22 265 128

Mean May 21 Sept. 19 121

Extremes April 25 Aug. 22 87
June 20 Oct. 11 159


- 16-









TABLE XI. Summary of meteorological data at Colorado Agricultural Experiment Station, Fort Collins, Colorado, 1887 to 1957.

Max. Period
Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec. Year Var. Years


Mean temperature, F.
Standard deviation, F.
Average precipitation, inches
Median precipitation, inches
Maximum precipitation, inches
Minimum precipitation, inches
Average barometric pressure,
inches mercury
Standard deviation, inches mercury
Average relative humidity at
7 A.M. and 7 P.M. in percent
Average dew point temperature
SF. at 7 A.M. and 7 P.M.
Terrestrial radiation F.
Soil temperature F. average 3 in.
of 7 A.M. and 7 P.M. at depths: 6 in.
12 in.
24 in.
36 in.
72 in.
Maximum variation vertical
Average wind velocity, M.P.H.
65 ft. above ground surface
Average snow depth, inches
Evaporation, inches per day
Average water temp. 7 A.M. and 7 P.M. *F
Average wind velocity, M.P.H.
15 inches above surface


26.1 28.6 36.0 46.0 54.5 63.8 69.5 68.0 59.7 48.6 36.3 28.5 47.2 43.4 71
5.1 6.1 4.9 3.4 2.8 2.7 2.3 1.8 2.5 2.7 3.6 4.6 1.51 -.
0.36 0.56 1.00 2.01 2.81 1.66 1.53 1.45 1.25 1.10 0.50 0.45 14.68 2.45 71
0.29 0.48 0.78 1.49 2.44 1.50 1.19 1.01 0.79 0.78 0.42 0.26 13.74 2.18 71
2.32 1.65 3.35 10.56 7.47 6.31 4.95 7.39 7.34 6.70 1.98 4.08 27.57 -.. 71
0.00 0.03 0.05 0.05 0.45 0.03 Tr. 0.05 0.01 0.00 0.00 0.00 7.11 -.. 71


24.940 24.937 24.907 24.932 24.949 24.984 25.074 25.077 25.052 25.038 25.017 24.965 24.989 0.170 71
0.064 0.064 0.057 0.047 0.043 0.044 0.030 0.031 0.041 0.044 0.059 0.052 0.016


71.3 71.3 65.6 59.7 61.9 61.6 63.1 65.2 66.6 67.4 69.6 72.3 66.3 12.6 69


11.9 14.3 20.3 28.9 39.4 48.8 54.4 52.6 43.1 31.2 20.1 14.3 31.6 42.5 69
4.2 3.9 3.7 3.6 4.4 4.9 4.8 4.5 4.5 4.3 4.4 4.3 4.3 1.3 69
28.0 30.2 37.0 47.2 56.8 67.0 72.6 70.3 62.0 49.2 37.0 30.1 48.7 44.6 68
29.2 31.0 37.4 47.8 57.0 67.2 73.0 71.2 63.6 51.4 39.0 31.6 50.0 43.8 67
30.6 31.7 37.2 47.4- 56.6 66.2 72.2 71.4 64.6 53.2 41.2 33.6 50.4 41.6 67
33.4 33.2 37.4 45.9 54.3 63.2 69.6 69.8 64.8 55.4 44.5 37.0 50.7 36.6 68
36.1 35.4 38.0 44.6 52.2 60.2 66.7 68.0 64.6 56.9 47.2 40.0 50.8 32.6 62
43.2 41.1 41.4 44.9 49.8 55.5 60.8 63.6 63.2 59.2 53.2 47.4 52.0 22.5 52
15.2 10.9 4.4 3.2 7.2 11.7 12.2 7.8 2.8 10.0 16.2 17.3 3.3


6.42 6.55 7.46 7.81 6.60 5.39 4.73 4.59 4.85 5.31 5.89 5.94 5.96 3.22 65
5.5 6.7 8.6 6.2 1.2 Tr. 0 0 0.2 2.5 5.2 5.4 41.5 8.6 69
0.142 0.163 0.197 0.208 0.187 0.158 0.107 66
47.9 57.7 67.2 72.4 70.5 62.2 49.6 66

2.68 1.92 1.25 0.99 0.92 1.05 1.30 62




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