Table 1. Description of 13 climatic factors and corresponding calculated formula.

Variable	Abbreviation	Unit
Annual mean temperature	AMT	°C
Mean temperature of the warmest month	MTWM	°C
Mean temperature of the coldest month	MTCM	°C
Annual range of temperature a	ART	°C
Annual precipitation	AP	mm
Precipitation of wettest month	PWM	mm
Precipitation of driest month	PDM	mm
Precipitation of seasonality b	PSD	%
Annual biotemperature c	ABT	°C
Warmth index d	WI	°C
Coldness index e	CI	°C
Potential evapotranspiration rate f	PER	°C /mm
Humidity index g	HI	mm/°C

^a ART = Mean of monthly (max temp—min temp).

^b PSD = Coefficient of variation.

^c ABT = (∑T)/12 (T is 0<T<30°C mean month temperature).

^d WI = ∑(T-5) (T is >5°C mean month temperature).

^e CI = -∑(5-T) (T is <5°C mean month temperature).

^f PER = 58.93×ABT/AP;

^g HI = AP/WI.