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 shaded area represents the average summer temperature and the 

 unshaded portions the average temperature for the year. From 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. 



