Table 3. Comparisons of model validation results for mean temperature, minimum temperature, maximum temperature and relative humidity based on leave-one-out approach.

Spatial interpolation method	Response variable and fixed factors used	MAE	CV	COR
Larger MAE and CV values indicate worse fits, while larger COR values indicate better fit.
Mean temperature
Thin Plate Spline	None	3.85	0.21	0.38
	Altitude	1.67	0.09	0.90
	Altitude, distance to ocean	1.75	0.1	0.88
	Altitude, CPC temp	3.58	0.19	0.66
	Altitude, Worldclim temp	1.21	0.07	0.95
Ordinary kriging	Altitude, Worldclim temp, CPC temp	1.23	0.07	0.94
	None	3.45	0.21	0.43
	Altitude, Worldclim temp	1.09	0.06	0.96
	Altitude, Worldclim temp, CPC temp	1.13	0.06	0.95
Minimum temperature
Ordinary kriging	Altitude, Worldclim temp	1.26	0.08	0.95
	Altitude, interpolated mean temp.	1.13	0.07	0.96
	Altitude, Worldclim temp, interpolated mean temp.	1.46	0.1	0.93
Maximum temperature
Ordinary kriging	Altitude, Worldclim temp	1.54	0.07	0.92
	Altitude, interpolated mean temp.	2.02	0.1	0.85
	Altitude, Worldclim temp, interpolated mean temp.	2.03	0.1	0.85
Relative humiditya
Ordinary kriging	Altitude, Worldclim temp	5.49	0.3	0.86
	Altitude, interpolated mean temp.	1.40	0.1	0.92
	Altitude, Worldclim temp, interpolated mean temp.	1.46	0.1	0.91

^aDerived using Equation 3.