Colorado Climatology 
35 
TABLE XX—MONTHLY MEAN TERRESTRIAL RADIATION 
At the Colorado Experiment Station, Fort Collins, Colorado. 
(Difference between Monthly Minimum and Terrestrial 6 Inches from 
Ground.) 
Date. 
1 T 
1 Jan. 
1 
Feb. 
Mar. 
Apr. 
May 
1 1 1 | 
June| July|Aug.|Sept t| | Oct. 
Novj| Dec. 
1 
| Yr. 
1889. 
9.9 
9.1 
8.6 
5.5 
7.6 
7.1 
6.3 
7.2 
7.3 
5.9 
6.8 
6.2 
7.3 
1890 . 
4.2 
5.1 
4.8 
3.9 
7.2 
9.5 
9.0 
9.7 
4.2 
4.8 
8.5 
9.9 
6.7 
1891. 
6.5 
3.6 
5.3 
6.8 
7.4 
5.3 
4.4 
4.2 
5.4 
6.0 
5.5 
5.0 
5.4 
1892 . 
3.9 
3.8 
4.0 
4.8 
5.3 
6.5 
5.7 
6.0 
6.5 
5.7 
5.9 
5.0 
5.3 
1893 . 
5.5 
5.0 
3.9 
4.5 
5.1 
7.6 
5.3 
4.6 
6.0 
5.5 
4.9 
4.8 
5.2 
1894 . 
5.1 
4.3 
4.0 
3.9 
5.7 
6.0 
5.2 
5.0 
5.6 
7.0 
4.9 
4.6 
5.1 
1895 . 
4.5 
4.1 
3.9 
4.9 
5.6 
4.2 
4.3 
4.1 
4.3 
5.1 
5.4 
5.9 
4.7 
1896 . 
5.3 
5.2 
3.4 
4.5 
6.3 
3.8 
4.0 
5.6 
5.1 
6.9 
6.4 
5.3 
5.2 
1897 . 
4.4 
4.1 
3.8 
4.0 
5.4 
4.7 
5.2 
4.7 
4.2 
4.1 
4.0 
4.8 
4.5 
1898 . 
5.0 
5.2 
5.6 
4.4 
2.8 
2.9 
2.9 
2.9 
3.1 
3.4 
3.3 
4.0 
3.8 
1899 . 
4.2 
3.3 
2.4 
3.3 
3.7 
3.8 
3.6 
4.9 
4.7 
3.6 
4.6 
4.5 
3.9 
1900 . 
4.0 
3.9 
2.9 
2.9 
5.4 
6.5 
5.5 
6.1 
5.8 
6.0 
5.9 
6.3 
5.1 
1901. 
5.8 
5,2 
4.2 
4.6 
7.6 
7.1 
7.0 
5.4 
6.2 
6.0 
7.1 
3.8 
5.8 
1902. 
3.7 
3.6 
4.4 
4.8 
5.4 
5.4 
5.1 
5.1 
. 4.6 
3.4 
4.7 
4.0 
4.5 
1903 . 
3.8 
4.5 
2.4 
4.7 
5.2 
4.3 
7.5 
5.7 
5.0 
4.2 
1904. 
. . . 
4.3 
3.3 
3.1 
3.7 
4.3 
6.0 
7.4 
8.0 
6.8 
1905. 
5.0 
5.3 
5.2 
4.2 
6.3 
9.3 
1906 . 
7.7 
5.4 
2.8 
5.3 
6.9 
6.0 
6.3 
5.8 
4.4 
4.0 
4.0 
4.8 
5.3 
1907. 
2.8 
3.9 
4.7 
3.9 
5.8 
8.4 
7.8 
6.5 
6.0 
5.4 
5.4 
5.7 
5.5 
1908 . 
5.6 
5.0 
5.2 
5.9 
4.9 
7.2 
5.2 
4.4 
6.2 
3.8 
4.2 
3.8 
5.1 
190 9. .%_ 
2.7 
3.9 
2.7 
2.6 
6.8 
7.4 
5.0 
4.0 
3.8 
4.9 
3.9 
3.6 
4.3 
1910. 
3.9 
4.4 
5.4 
4.7 
4.7 
3.3 
4.0 
3.4 
3.6 
4.2 
3.4 
3.9 
4.1 
1911. 
3.6 
3.2 
3.1 
3.2 
3.6 
4.1 
3.4 
4.5 ^ 
4.3 
3.3 
2.9 
4.1 
3.6 
Average . . . | 
4.9 
4.6 
4.2 | 
4.4 | 
5.6 | 
5.9 | 
5.4 
5.3 | 
5.2 
5.0 
5.0 
5.0 
5.0 
Maximum.. | 
9.9 
9.1 
8.6 | 
6.8 | 
7.6 | 
9.5 | 
9.0 
9.7 | 
8.0 | 
7.0 
8.5 
9.9 
7.3 
Minimum. . | 
! 2.7 | 
3.2 | 
2.4 | 
2.6 | 
2.8 | 
2.9 | 
2.9 | 
2.9 | 
3.1 | 
3.3 | 
2.9 
3.6 
3.6 
' TABLE XXI—MONTHLY MEAN TERRESTRIAL RADIATION 
THERMOMETER 
At the Colorado Experiment Station, Fort Collins, Colorado. 
6 Inches from the Ground. 
13a te. 
Jan. 
Feb. 
Mar. 
Apr. 
May 
June 
| JulyJ|Aug. 
|Sept. 
| Oct. 
Nov. 
[ Dec. 
I Yr. 
1889. 
1890 . 
4.4 
9.9 
18.4 
29.2 
33.8 
37.3 
46.2 
41.5 
35.2 
26.3 
12.8 
8.4 
25.3 
1891. 
2.5 
4.3 
14.4 
25.1 
33.8 
42.1 
47.4 
45.5 
38.8 
20.4 
16.3 
11.3 
25.2 
1892 . 
3.4 
13.5 
17|9 
24.7 
33.6 
40.0 
47.3 
42.4 
35.6 
25.9 
17.3 
4.3 
25.5 
1893 . 
10.3 
7.3 
16.2 
23.8 
32.7 
39.6 
48.1 
45.9 
32.8 
26.2 
12.5 
15.2 
25.9 
1 8 P 4. 
9 0 
w. u 
—0.6 
18.4 
28.2 
37.0 
41.0 
47.6 
46.5 
35.9 
27.1 
18.4 
6.2 
25.8 
1895. 
6.4 
2.8 
16.0 
27.2 
33.2 
40.7 
47.1 
47.2 
37.6 
24.7 
13.6 
8.1 
25.4 
1896 . 
10.8 
12.4 
18.4 
26.0 
35.0 
45.7 
51.7 
47.3 
40.0 
24.5 
10.2 
13.7 
28.0 
1897 . 
4.9 
10.2 
16.1 
28.0 
37.3 
43.5 
44.7 
46.7 
43.1 
28.3 
16.2 
7.6 
27.2 
1898. 
1 899 . 
5.6 
6.2 
12.4 
—8.8 
11.9 
15.6 
26.4 
25.6 
37.6 
34.3 
45.3 
43.6 
50.1 
49.0 
49.3 
46.9 
35.8 
37.4 
28.0 
28.4 
12.8 
20.3 
5.3 
8.2 
26.7 
25.6 
1.900 . 
11.2 
6.8 
21.4 
28.4 
37.8 
44.2 
46.8 
43.4 
37.5 
26.8 
15.7 
9.7 
27.5 
1901. 
6.8 
4.6 
18.5 
26.4 
35.2 
41.2 
48.2 
48.0 
34.4 
26.8 
16.2 
11.6 
26.5 
1902. 
1 903 . 
5.4 
12.6 
9.8 
—4.6 
17.9 
15.9 
25.7 
26.5 
36.3 
31.3 
42.8 
42.7 
44.2 
44.6 
47.2 
35.4 
33.6 
29.7 
26.6 
17.9 
14.7 
10.3 
26.9 
1904. 
. . . 
18.2 
21.0 
28.2 
37.5 
42.0 
44.7 
43.8 
34.4 
24.6 
17.4 
1905. 
7.6 
1.5 
24.0 
27.3 
34.2 
40.7 
1906 . 
5.6 
7.3 
10.8 
29.0 
34.8 
41.2 
44.7 
45.2 
39.9 
26.5 
17.i 
16.7 
26.6 
1907. 
9.6 
16.0 
22.6 
25.2 
31.2 
36.8 
44.6 
44.4 
36.2 
26.7 
10.8 
9.9 
26.2 
1908 . 
6.3 
8.2 
19.1 
24.7 
33.4 
39.3 
47.7 
47.6 
38.1 
27.8 
11.0 
8.1 
25.9 
1 9^0. 
14.1 
10.1 
21.2 
26.4 
31.1 
41.8 
50.0 
50.8 
40.2 
27.3 
21.0 
2.0 
28.0 
1910. 
6.6 
6.2 
23.2 
28.3 
35.9 
45.7 
51.0 
48.6 
42.8 
29.7 
23.3 
13.8 
29.6 
1911. 
14.5 
10.7 
23.0 
29.0 
37.6 
47.0 
1 
49.4 
46.2 
1 
41.9 
28.1 
1 
14.5 
1 
5.3 
28.9 
Average.. . 1 
7.5 
7.2 
13.7 
26.8 
34.8 | 42.0 | 
47.4 | 
46.2 | 
37.5 | 
26.7 | 
15.7 | 
9.2 | 
26.2 
Maximum.. | 
14.5 
18.2 
24.0 
29.2 
37.8 | 47.0 
51.7 | 
50.8 | 
43.1 | 
29.7 | 23.3 | 
16.7 
29.6 
Minimum. . | 
2.5 
—8.8| 
10.8 | 
23.8 | 
31.1 | 
36.8J 
44.2 j 
41.5 | 
32.8 | 
20.4 | 
10.2 | 
2.0 | 
25.2 
