258 



THE SMALL GRAINS 



15.2 to 16.6 inches, but about f of that amount falls in 

 the growing season (May to September inclusive). At 

 three points in the Great Plains, Bismarck, North Platte, 

 and Dodge City, the yearly mean runs from 18.1 to 19.8 



FIG. 76. Climatological map of the United States and Canada. 



inches, while the seasonal average is about f of that 

 amount, ranging from 11.5 to 13.7 inches. In respect to 

 rainfall, the conditions in the Chernozem are again a 

 little more severe than in the Great Plains. The yearly 



