18 



The highest temporatuiv :it l^ozoman during the past twent3'-two 

 3'ears, as shown by Koch's records, is 100" F. The mean relative 

 humidity of the GaHatin Valley is about 10 per cent. Onl}' twice in 

 twentv-two years lias the iikm-cui'v in the shade risen to 100° F. The 



w/^/7 red Mar Apr a7<3/ ^^/?e ^c// Ai/y Sept Oct A'ov. Oec. 



Fig. 2. — Mean monthly precipitation, Bozeman, Mont., January, ISnO, to December, 1902. 



averag-e maximum temperature for that period is 5)3° F. Figure 3 

 shows the mean monthly temperatures from Januar}^ 1, 1880, to Janu- 

 ary- 1, 1902. The averages for June, July, August, and September 

 are 57.1°, 63.8", 65.7°, and 53.7", respectiveh'. 



70 



60 



\50 



I 



^50 



2.0 



/O . 



■y^/f re/f. /ys?/" Apr /id/ Joioe Ji//y Ai/y. ^ept Oct A'oK Dec 



Fl(i. 3. — .Mean nioiitlily tcm]icratnres, Bozeman. Mont.. ISSU to 1902. 



The impression prevails in man}" States that the winter climate of 

 Montana is very severe. This impression is not in accord with the 

 mean monthly temperature records as indicated in figure 3 and given in 

 the followinir table. 



. ^^^^^_ _^^^^_i _^^B»a 



