584 METEOROLOGICAL OBSERVATIONS. 
Summary of Barometric and Temperature Observations at Fort Benton. 
Barometric means corrected. Means and extremes of temperature. 23 
Date. zs cS. — = ; = 5 
TAM. 2p. M. 9r.m. | Mean. 7A.M. 2P.™M. 9p. M. Mean. Maxinium.|Minimum. E 
< 
° ° ° ° ° ° Tnches 
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...0.sceeccns ence 284 239 251 258 47.13 61.58 50.80 53.07 81 10 0.187 
November, 1853 ....++++005 <e +235 212 235 227 12.90 27.40 18.13 19,48 58 —2 0.300 
December, 1853 .....eeese 000s -218 193 197 203 27.16 41,32 30.52 33.00 60 0 0.000 
January, 1854 ....-.eeeeee sans 264 232 245 247 13.74 22.52 13,26 16.52 61 —24 1.592 
February, 1854...... ee 192 135 151 159 18.71 36.79 24.43 26.63 57 —6 3.410 
March, 1854.....eseeeeees ose 192 141 191 174 30.65 46.52 31.36 36.18 71 12 3.420 
April, 1854. ..cereceeceseseees 203 150 162 172 50.33 64,87 50.40 55.20 81 38 ¢0.400 
May, 1854.... e000 173 lL 103 129 51.73 67.34 55.82 58.30 89 32 71.100 
June, 1854... cece cccecesesscece -170 -104 097 124 63.10 77.20 64.70 68.30 91 49 $0.450 
Tully, 1854. .cccccccevsces eves 290 229 249 +256 69.80 82.70 68.40 73.60 100 49 $— 
August, 1854...sccceesecocees +260 +202 198 220 72.10 86.61 70.57 76.43 98 62 I- 
Mean Of all ....seeceees| 27.227 27.180 27.192 27.200 
Ee 
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. 
; 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, 
