Table 1.

Value assignment of the climatic and geographic factors

Geographical climate index	Variable	Assignment
Annual precipitation (AP)	0 mm ≤ AP < 200 mm	1
	200 mm ≤ AP < 500 mm	2
	500 mm ≤ AP < 1000 mm	3
	1000 mm ≤ AP < 2000 mm	4
	2000 mm ≤ AP	5
Annual atmospheric temperature (AAT)	30°C ≤ AAT	6
	20°C ≤AAT < 30°C	5
	10°C ≤ AAT < 20°C	4
	0°C ≤AAT < 10°C	3
	-10°C ≤ AAT < 0°C	2
	-20°C ≤ AAT < -10°C	1
Temperature climate zone (TCZ)	frigid zone	1
	subfrigid zone	2
	temperate zone	3
	subtropical zone	4
	tropical zone	5
Geography climatic zone (GCZ)	continental climate	1
	transitional climate	2
	oceanic climate	3
Geography latitude (GL)	0° ≤ GL < 25°	3
	25° ≤ GL < 50°	2
	50° ≤ GL < 75°	1