METEOROLOGY. 17 



Number of days in the ivinter months when the tliermometer averaged above 32°. 



Locality. 



Cantonment Stevens . 



Fort Owen 



Fort Benton 



Salt Lake City 



Fort Laramie , 



Fort Kearney 



Fort Snelling 



Fort Garry 



Montreal ., 



Quebec 



Albany 



Boston 



1853-'54. 



32 



43 

 34 

 51 

 47 

 6 



5 

 IS 

 31 



Other winters, and remarks. 



46 in 1854-'55. 



None in 1855-56. 



But it may be objected that tL , temperature of Fort Benton and Cantonment Stevens is not 

 the measure of the temperature of the intermediate rocky range through which the route 

 passes, and which is much more elevated. Fortunately, the party of Lieutenant Grover made 

 observations of temperature on the route, and it has been found by careful comparisons that 

 the party made the passage during the extreme cold weather of that winter, so that the temper- 

 ature then observed gives the extreme cold of the pass, and not the usual cold. A very 

 intelligent young man who accompanied Lieutenant Grover to Fort Benton returned imme- 

 diately, and found the weather very mild and pleasant in the pass, corresponding to the 

 observed temperatures at Fort Benton and Cantonment Stevens. 



The following tables show the temperatures as observed by Lieutenant Grover in the pass, 

 and at the stations on each side of it, during eleven of the coldest days in January, 1854, with 

 a comparison of these with the corresponding coldest days at other points. 



