584 
METEOROLOGICAL OBSERVATIONS, 
Summary of Barometric and Temperature (Reservations at Fort Benton. 
Date. 
Barometric means corrected. 
Means 
aitd extremes of temperature. 
Amount of rain 
and melted 
snow. 
7 A. M. 
2 P. M. 
9 p. M 
Mean. 
7 A. M. 
2 P. M. 
9 P. M. 
Mean. 
Maximum. 
Minimum. 
0 
o 
0 
o 
o 
o 
Inches. 
September, 1853, (last 7 days) 
27.336 
27.302 
27.309 
27.316 
56.70 
63.00 
63.90 
60.90 
75 
51 
*1.612 
October, 1853. 
.284 
.239 
.251 
.258 
47.13 
61.58 
50.80 
53.07 
81 
10 
0.187 
November, 1853. 
.235 
.212 
.235 
.227 
12.90 
27.40 
18.13 
19.48 
58 
—2 
0.300 
December, 1853 . 
.218 
.193 
.197 
.203 
27.16 
41.32 
30.52 
33.00 
60 
0 
0.000 
January, 1854 . 
.264 
.232 
.215 
.247 
13.74 
22.52 
13.26 
16.52 
61 
—24 
1.592 
February, 1854 . 
.192 
.135 
.151 
.159 
18.71 
36.79 
24.43 
26.63 
57 
—6 
3.410 
March, 1854. 
.192 
.141 
.191 
.174 
30.65 
46.52 
31.36 
36.18 
71 
12 
3.420 
April, 1854. 
.203 
.150 
162 
.172 
50.33 
64.87 
50.40 
55.20 
81 
38 
f0.400 
May, 1854. 
.173 
■ 111 
.103 
.129 
51.73 
67.34 
55.82 
58.30 
89 
32 
fl.100 
June, 1854. 
.170 
.104 
.097 
.124 
63.10 
77.20 
64.70 
68.30 
91 
49 
fO.450 
July, 1854. 
.290 
.229 
.249 
.256 
69.80 
82.70 
68.40 
73.60 
100 
49 
t ~ 
August, 1854 . 
.260 
.202 
.198 
.220 
72.10 
83.61 
70.57 
76.43 
98 
62 
II - 
Mean of all. 
27.227 
27.180 
27.192 
27.200 
Means of temperature—spring, 49.89°; summer, 72.78° ; autumn,§ 46.85°; winter, 28.38°; year, 48.72°. 
Altitude of Fort Benton from these observations, 2662.9 feet. 
* For the last seven days only, 
t In part, several rains not measured. 
{Two days on which rain fell. 
|| Four days on which rain fell. 
§ Mean for September assumed at 68°. See remarks for notice of the peculiar temperatures of the seasons. 
