26 



DRY FARMING 



heat received from the sun during the growing season. 

 At the same time the extremes of low temperature with- 

 in the growing period limit the successful growth of the 

 warm weather crops such as corn, sorghum, Sudan 

 grass and certain of the heat-loving vegetables. 



16. The Temperature Zones of Canada. The average 

 temperatures for the year and for the summer for the 

 whole of Canada is shown in Fig. 12. From this it will 



Fig. 12. Temperature Zones of Canada. 



The shad-'il area represents the average summer temperature and the 

 unshaded portions the average temperature for the year. Prom Meteoro- 

 logical Reports. 



be observed that southern Alberta and southwestern 

 Saskatchewan and the southern part of the Red River 

 Valley are the warmest for both the year and the sum- 

 mer, and that the temperature decreases in a north- 

 easterly or a northerly direction, but that in the direc- 

 tion of northern Alberta and northwestern Saskatch- 

 ewan the temperature decreases less rapidly than in 

 northern Manitoba. 



