30 DRY FARMING 



and the actual figures are quoted in the table that fol- 

 lows. These show very favorable temperatures for 

 growth in summer even at far north points sueh as Fort 

 Simpson. The more rapid fall of autumn temperatures 

 and the lower temperatures in spring, in the northern 

 latitudes, indicate a shorter growing season. By com- 

 paring the monthly rainfall and monthly temperature 

 illustrations it will be seen that the months of highest 

 temperature follow closely the months of greatest rain- 

 fall. To this fortunate "accident" of climate is largely 

 due such success as has attended the efforts of the crop 

 grower in the Canadian West. 



TABLE V. The Average Mean Monthly and Annual Temperatures 

 at Representative Points* 



Station Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Yr. 



Ft. Simpson 18 16 4 26 42 55 59 56 45 24 1 12 21 



20. The Total Heat Received During the Period of 

 Growth. The total amount of heat received during the 

 growing season may be determined by multiplying the 

 number of days of growth by the difference between the 

 temperature required for plant growth and the average 

 daily temperature for the period. The result is spoken 

 of as the "accumulated temperatures" which is the sum 

 of the "day degrees" of temperature between the time in 



From Canadian Year Book reporting Dominion Meteorological 

 Service data Calpary 20 years, Edmonton 25 years, Prince 

 Albert 20 years and Winnipeg 70 years. Data for other places 

 taken from the "Climate of Canada", by Stupart, 



