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 Jan. 
1 
Feb. 
Mar. 
Apr. 
May 
June| July|Aug.|septJ| Oct. 
III! 
Nov 
1 , 
1 Dec. 
j 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. 
<5,5 
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 
4.6 
176 
O 
O 
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 
1909. 
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 
1 
3.4 
1 
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 j 
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. 
Date. 
Jan. 
Feb. 
Mar. 
Apr. 
May 
I 1 1 1 
June| July|Aug.|Sept | Oct. 
Nov. 
\ Dec. 
Yr. 
1889 . 
4.4 
2.5 
3.4 
10.3 
f» O 
6.4 
10.8 
4.9 
5.6 
6.2 
11.2 
6.8 
5.4 
12.6 
7.6 
5.6 
9.6 
6.3 
14.1 
6.6 
14.5 
' 
25.3 
25.2 
25.5 
25.9 
25.8 
25.4 
28.0 
27.2 
26.7 
25.6 
27.5 
26.5 
26.9 
26!6 
26.2 
25.9 
28.0 
29.6 
28.9 
1890 . 
1891 . 
1892 . 
1893 . 
] 884. 
1895 .1 
1896 .I 
1897 . 
1898 . 
1899 . 
9.9 
4.3 
13.5 
7.3 
1 — 0.6 
2.8 
12.4 
10.2 
12.4 
8 8 
18.4 
14.4 
17|9 
16.2 
18.4 
16.0 
18.4 
16.1 
11.9 
15.6 
21.4 
18.5 
17.9 
15.9 
21.0 
24.0 
10.8 
22.6 
19.1 
21.2 
23.2 
23.0 
29.2 
25.1 
24.7 
23.8 
28.2 
27.2 
26.0 
28.0 
26.4 
25.6 
28.4 
26.4 
25.7 
26.5 
28.2 
27.3 
29.0 
25.2 
24.7 
26.4 
28.3 
29.0 
33.8 
33.8 
33.6 
32.7 
37.0 
33.2 
35.0 
37.3 
37.6 
34.3 
37.8 
35.2 
36.3 
31.3 
37.5 
34.2 
34.8 
31.2 
33.4 
31.1 
35.9 
37.6 
37.3 
42.1 
40.0 
39.6 
41.0 
40.7 
45.7 
43.5 
45.3 
43.6 
44.2 
41.2 
42.8 
42.7 
42.0 
40.7 
41.2 
36.8 
39.3 
41.8 
45.7 
47.0 
1 
46.2 
| 47.4 
47.3 
48.1 
47.6 
47.1 
51.7 
44.7 
50.1 
49.0 
46.8 
48.2 
44.2 
44.6 
44.7 
44.7 
44.6 
47.7 
50.0 
51.0 i 
49.4 | 
41.5 
45.5 
42.4 
45.9 
46.5 
47.2 
47.3 
46.7 
49.3 
46.9 
43.4 
48.0 
47.2 
43 .8 
45.2 
44.4 
47.6 
50.8 
48.6 
46.2 
1 
35.2 
38.8 
35.6 
32.8 
35.9 
37.6 
40.0 
43.1 
35.8 
37.4 
37.5 
34.4 
35.4 
33.6 
34.4 
39.9 
36.2 
38.1 
40.2 
42.8 
41.9 
1 
26.3 
20.4 
25.9 
26.2 
27.1 
24.7 
24.5 
28.3 
28.0 
28.4 
26.8 
26.8 
29.7 
26.6 
24.6 
26.5 
26.7 
27.8 
27.3 
29.7 
28.1 
12.8 
16.3 
17.3 
12.5 
18.4 
13.6 
10.2 
16.2 
12.8 
20.3 
15.7 
16.2 
17.9 
14.7 
17.4 
17.1 
10.8 
11.0 
21.0 
23.3 
14.5 
8.4 
11.3 
4.3 
15.2 
6.2 
8.1 
13.7 
7.6 
5.3 
8.2 
9.7 
11.6 
10.3 
16.7 
9.9 
8.1 
2.0 
13.8 
5.3 
1900 . 
1901 . 
1902.-. 
1903 . 
6.8 
4.6 
9.8 
4 6 
1904 . 
1905 . 
1806. 
1907 . 
1908 . 
19^9. 
1910 . 
1911 . 
. 
18.2 
1.5 
7.3 
16.0 
8.2 
10.1 
6.2 
10.7 
Average. . . 
7.5 
7.21 
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 I 
51.7 | 
50.8 | 
43.1 | 
29.7 
23.3 | 
16.7 | 
29.6 
Minimum. . | 
2.5 
—8.81 10-8 | 
23.8 | 
31.1 | 36.8 | 
44.2 | 
41.5 | 
32.8 | 
20.4 
10.2 | 
2.0 1 
25.2 
