GEOLOGICAL SUEVEY OF THE TEERITOEIES. 



811 



o 



The mean temperature at Helena, Montana, for 1866, was 44.5 



The mean temperature at Deer Lodge, Montana, for 1868 40.5 



The mean temperature at Deer Lodge, Montana, for 1869 4'J.9 



The mean temperature at Deer Lodge, Montana, for 1870 42.1 



The mean temj)erature at Deer Lodge, Montana, for 1871 42.5 



The mean temperature at Helena, Montana, for January, 1867 . . . 17.9 

 The mean temperature at Helena, Montana, for February, 1867 . . 18.0 



The mean temperature at Helena, Montana, for March, 1867 5.9 



The mean temperature at Helena, Montana, for April, 1867 44.8 



The mean temperature at Deer Lodge, Montana, for ISTovember, 1867 30,5 

 The mean temperature at Helena, Montana, for December, 1867 . . 25.2 



The fall of rain and melted snow at Helena, in 1866, inches 22.96 



The fall of rain and melted snow at Deer Lodge, in 1870, inches. . 16.50 

 The fall of rain and melted snow at Deer Lodge, in 1871, inches. . 15.74 



The average fall of rain and melted snow at Deer Lodge for four 

 years, 19.11 inches. 



A series of observations shows that Missoula County, Montana, (alti- 

 tude 3,300 feet,) enjoys an average temperature of 5^.5 higher than Deer 

 Lodge, and, judging by farm products, this is about the annual mean of 

 the large valleys of Sun Eiver, Missouri, Gallatin, Jefferson, Madison, 

 Stinking Water, and Beaverhead. It thus appeal's that by far the greater 

 part of the Territor}^ has an annual mean temperature of about 48°. 



EESUME OF METEOROLOGICAL OBSEliVATIONS TAKEInT AT 

 FORT ELLIS, MONTANA, BY THE UNITED STATES MEDI- 

 CAL DEPARTMENT. 





Mean 



daily 



%nd minimum iempei-atures during the ivinter of 1871-72. 





Date. 



S 



o 



1 



Date. 



a? 



-23 



1 



3 



Date. 





a 



a 

 "3 



Date. 





g 

 a 



"3 



1871. 



Xov. 1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



16 



17 



18 



19 



20 



21 



22 



23 



24 



25 



26 



27 



23 



29 



30 



Dec 1 



2 



o 



37 

 40 

 40 

 37 

 31 

 30 

 24 

 33 

 37 

 37 

 34 

 25 

 35 

 35 

 35 

 29 

 16 

 25 

 31 

 31 

 38 

 32 

 50 

 17 

 — 9 

 ^16 

 —11 

 7 

 11 

 13 

 27 

 19 



o 



2(5 



— 2L 



— 2rs 

 —33 

 —30 

 —24 



— 5 



— 4 



— 2 

 6 



—26 



1871. 



Dec. 3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



16 



17 



18 



19 



20 



21 



22 



23 



24 



25 



26 



27 



28 



29 



30 



31 



1872. 



Jan. 1 



2 



o 

 9 

 31 

 46 

 33 

 36 

 24 

 24 

 24 

 21 

 23 

 27 

 31 

 26 

 25 

 —14 

 —22 



— 2 

 8 

 3 



— 9 

 —24 

 —30 

 —18 

 —32 

 —16 



33 

 36 

 33 

 29 



29 

 21 



o 



—19 



15 



32 



25 



10 



10 



10 



5 



7 



15 



18 



10 



5 



—15 



—23 



—26 



—16 



— 5 



—26 



—21 



—30 



—45 



—40 



—42 



—33 







6 



—10 



—15 



10 

 2 



1872. 

 Jan. 3 

 4 

 5 

 6 

 7 

 8 

 9 



10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 2^ 

 25 

 26 

 27 

 28 

 29 

 30 

 31 

 Feb. 1 

 2 

 3 



c 



23 

 18 

 10 



5 

 31 

 28 

 34 

 30 

 25 

 18 

 33 

 22 

 13 

 19 

 19 

 15 

 13 



9 



6 



4 

 15 

 —41. 66 



o 



—12 



— 4 



8 



3 



10 



9 



19 



4 



o 







6 



—12 



—11 



I 



21 



12 



15 



7 



12 







—10 







— 6 



1 



—13 



—12 



—31 



-17 



—42 



—53 



—17 



—10 



—42 



—20 



—32 



—14 



—10 



—10 



-11 



—21 1 



1872. 



Feb. 4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



16 



17 



18 



19 



20 



21 



22 



23 



24 



25 



26 



27 



28 



29 



March 1 



2 



3 



4 



5 



6 







—38 

 —27 



12 



25 



23 



19 



15 



23 

 5 



14 



19 



27 



22 



33 



33 



23 



26 



35 



32 



12 



22 



32 



21 



18 



17 ' 



23 



20 



26 



29 



27 



31 



25 



o 



—53 



—51 



—30 



10 







10 







5 



— 1 



—25 



10 



15 



12 



10 



21 



6 



3 



6 



4 











10 



10 







—13 



— 8 

 8 

 4 

 6 



15 

 15 

 14 



