Impact of Continuous Cropping on the Diurnal Range of Dew Point Temperature during the Foliar Expansion Period of Annual Crops on the Canadian Prairies

Table 2

Rate of change of the average decadal mean daily dew point temperature () and decadal averages and standard deviations of dew point temperatures for climate stations representing selected ecodistricts in the Canadian Prairies for the 1960s to the 2000s.

Climatic zone	Weather station	Rate of change; (°C decade^−1)	Decadal average and standard deviation of dew point temperature (°C)
			1960s	1970s	1980s	1990s	2000s
Subhumid	Calgary	0.20	6.6 ± 1.2^n	6.1 ± 1.6^n	6.4 ± 1.8^n	7.7 ± 1.4^w	7.8 ± 1.4^w
	Edmonton	0.10	8.3 ± 1.1^d	9.4 ± 1.5^w	9.0 ± 1.5^w	9.4 ± 1.2^w	8.9 ± 1.5^d
	Grande Prairie	0.01	7.2 ± 1.1^n	7.4 ± 0.9^n	7.4 ± 2.0^n	8.5 ± 1.2^w	7.1 ± 1.1^n
	Prince Albert	0.19	9.5 ± 1.9^d	10.4 ± 1.2^w	9.5 ± 0.7^n	9.8 ± 1.7^w	10.3 ± 1.3^n
	Red Deer	0.06	7.9 ± 0.9^d	7.8 ± 1.4^n	8.8 ± 1.5^n	8.5 ± 1.6^w	8.5 ± 1.3^n
	The Pas	0.06	9.6 ± 2.0^d	10.8 ± 0.9^w	9.7 ± 1.1^n	10.3 ± 2.0^w	10.4 ± 1.4^w
	Winnipeg	0.42	10.9 ± 2.2^n	11.9 ± 1.4^w	12.2 ± 1.5^d	13.0 ± 1.9^n	13.0 ± 1.5^w
Semiarid	Estevan	0.16	10.9 ± 2.2^n	11.2 ± 1.1^w	10.3 ± 1.0^d	11.6 ± 1.4^w	11.9 ± 1.7^w
	Lethbridge	0.19	7.8 ± 0.9^d	6.8 ± 1.7^w	6.9 ± 1.7^d	8.6 ± 1.6^w	7.8 ± 2.2^n
	Medicine Hat	0.16	8.3 ± 1.2^d	8.1 ± 1.8^w	7.8 ± 1.9^d	8.8 ± 0.9^w	8.9 ± 1.8^n
	Moose Jaw	0.41	9.2 ± 2.2^n	9.9 ± 1.3^w	9.2 ± 1.2^d	10.6 ± 1.6^w	11.1 ± 1.7^w
	Regina	0.32	9.7 ± 1.9^n	9.9 ± 1.4^w	9.2 ± 1.0^d	10.7 ± 2.0^w	11.2 ± 2.2^w
	Saskatoon	0.47	8.8 ± 1.9^d	9.6 ± 1.6^w	9.0 ± 1.0^d	10.2 ± 1.7^w	11.1 ± 1.3^n

Ecodistricts experiencing dry, normal, and wet growing season based on decadal average of total precipitation compared to 30-year normal precipitation from the start of the growing season (DOY 91) to the peak of foliar expansion period of annual crops (DOY 195).