TABLES OF TEMPERATUAE FROM 1872 TO 1878. 
110 
That no fact of any value bearing on this question cau be obtained 
by an examination of the annual mean temperature can readily be shown 
by a few examples. For instance, the extreme variation of the annual 
mean at Fort Leavenworth for 40 years is only 7.83°, and the extreme 
variation from 1800 to 1870 is only 5.20°; at Muscatine, Iowa, for 25 
years it is but 8.13°; at Fort Snelling, Minn., for 42 years it is only 8.40°. 
The following tables of temperature and rainfall for the years 1872 to 
1878 are extracted from the annual reports of the Signal Service Bureau. 
The records of the different stations are. brought together so that the 
variations may be readily seen by running the eye over the columns. 
Table VI. — Monthly and annual mean temperature from 1872 to 1878. 
Tears and sta- 
tions. 
Annual. 
January. 
February. 
March. 
April. 
May. 
June. 
July. 
August. 
September. 
October. 
u 
<a 
a 
s 
> 
December. 
FORT BENTON, 
MONT. 
1872 
■ 
o 
o 




o 
o 
o 
47. 2 
40.3 
49.8 
51.1 
o 
24.3 
35.1 
19.4 
17.1 

11. 3 
13.7 
29.6 
36.8 
1873 
1874 
1875 
1876 
42.5 
42.4 
43.5 
16.5 
11.3 
-8.6 
13.9 
18.4 
22.4 
13.9 
16.7 
36.4 
18.4 
27.8 
13.3 
40.7 
44.4 
43.0 
47.4 
52.4 
59.2 
58.1 
56.8 
64.1 
63.0 
62.0 
63.8 
69.8 
75.1 
74.5 
69.3 
69.1 
68.9 
53.2 
58.0 
60.6 
PEMBINA, DAK. 
1872 
18.4 
16.1 
14.4 
11.1 
15.4 
25.7 
1873 
12.9 
11.9 
33.9 
29.4 
32.9 
35.4 
33.1 
45.5 
52.3 
55.3 
53.3 
54.6 
56.8 
47.9 
66.1 
64.4 
59.2 
60.5 
55.7 
63.7 
65. 2 
69^9 
64.9 
67.4 
68.1 
64. 4 
67^0 
64.3 
63.7 
64.3 
46. 8 
56.2 
52.7 
51.9 
55.4 
35. 4 
42! 2 
37.5 
37. 1 
40.0 
O. D 
1874 
-3.0 
2.6 
.8.1 
-6.3 
27.4 
1876 
1877 
1878 
36.3 
oo. y 
-2.6 
— O. A 
11.2 
-4.5 
25.5 
6.5 
8.3 
36.2 
VIRGINIA CITY, 
MONT. 
1872 
43.9 
23.6 
35 6 
25.7 
25.9 
30.9 
28.1 
18.8 
16.7 
24.9 
30.5 
24.4 
24.0 
1873 
23.4 
23.1 
1.7 
17.1 
18.8 
23.1 
15.6 
18.4 
22.8 
28.1 
27.5 
27.9 
1 
56.9 
53.9 
56.2 
57.1 
52.8 
58.6 
1874 
1875 
1876 
1877 
40.4 
39.4 
43.1 
40.3 
24.1 
22.8 
24.7 
33.2 
37.8 
38.4 
37.9 
37.9 
36.5 
39.8 
51.1 
47. 1 
46.4 
44.0 
45.5 
67.7 
63.8 
64. 5 
65.2 
61.8 
60.8 
58.5 
65.2 
50.2 
55.9 
53.5 
51.7 
45.8 
47.7 
44.9 
39. 1 
BI6MARCK, MONT. 
1874 
41.3 
42.7 
40.7 
42.3 
18.1 
17. 2 
18.3 
28.6 
15.6 
20.1 
6.8 
29.1 
1875 
1876 
1877 
1878 
36.9 
36.8 
41.6 
-8.9 
7.9 
6.3 
17.5 
—5.9 
4.9 
26.5 
27.8 
15.3 
13.1 
19. 
40.4 
33.9 
40.3 
40.4 
47.0 
41.0 
35.0 
34.0 
36. 1 
38.3 
40.5 
47.6 
56.1 
56.0 
56.9 
50.8 
53.0 
52.0 
60.2 
56. 
56. 3 
58.4 
51.2 
58.3 
54.5 
63.2 
60. 1 
61.7 
58.6 
60.9 
61.4 
59. 
60.1 
65.0 
69.5 
65.9 
60.8 
63. 1 
58.9 
64.9 
70.3 
74.2 
70.2 
66.0 
68.1 
63.6 
69. 3 
70.3 
70.9 
66.2 
68.0 
69.7 
56.1 
53.7 
60.5 
BRECKEXRIDGE, 
MINN. 
1872 
67.1 
67.6 
70.2 
67.7 
70.9 
69.5 
65.1 
67.0 
67.8 
63.8 
67.6 
65.9 
58.3 
49. 1 
57.7 
55.4 
53.8 
58.5 
45.0 
38.2 
43.8 
42. 
38.1 
41.9 
21.0 
23.4 
21.4 
18. 3 
18.7 
27.0 
0.4 
8.0 
12.8 
18.1 
0. 1 
28.3 
1873 
1874 
1875 
1876 
1877 
1878 
35.2 
38.0 
34.6 
35.7 
38.1 
2.3 
2.6 
-9.5 
6.3 
-0.9 
14.7 
8.0 
4.2 
-7.9 
4.3 
21.5 
27.4 
10.4 
15.1 
14.7 
10.5 
15.2 
39.2 
FORT SULLEY, DAK. 
1872 
73.5 
74.3 
79.2 
73.9 
75.6 
74.9 
72.2 
75. 5 
76.1 
71.4 
73.1 
72.7 
62.4 
57.3 
65.2 
61.3 
58.6 
64.7 
31.5 
14.9 
26.9 
27.0 
13.7 
1873 
1874 
1875 
1876 
45. 5 
38.8 
41.5 
9.6 
16.1 
0.1 
18.7 
13.9 
14.7 
20. 3 
4.2 
14.4 
33.4 
32.4 
27.7 
22.3 
15.9 
23.8 
41.5 
43.9 
39.2 
42.1 
50.9 
48.9 
35.1 
26.2 
24.4 
1877 
44.7 
45. ! 
