Table 2.

Results of performance tests of different combinations of variables.

Variables	Performance tests	POL_SK	RLMULTI_ST	POL_ST	RED_N
Tmin, Tmax, Hu (Combination 13)	Coefficient of correlation	0.80	0.80	0.80	0.78
	R2 correlation	0.63	0.64	0.63	0.60
	RMSE	0.38	0.37	0.38	0.47
Tmin, Hu, Ra (Combination 8)	Coefficient of correlation	0.88	0.84	0.88	0.88
	R2 correlation	0.77	0.71	0.77	0.77
	RMSE	0.30	0.33	0.30	0.55
Tmin, Hu, Vel (Combination 9)	Coefficient of correlation	0.85	0.75	0.85	0.83
	R2 correlation	0.72	0.56	0.72	0.69
	RMSE	0.33	0.43	0.33	0.59
Tmin, Ra, Vel (Combination 7)	Coefficient of correlation	0.99	0.99	0.99	0.99
	R2 correlation	0.97	0.97	0.97	0.97
	RMSE	0.11	0.10	0.11	0.73
Tmed, Tmin, Hu (Combination 11)	Coefficient of correlation	0.70	0.73	0.70	0.72
	R2 correlation	0.49	0.54	0.49	0.51
	RMSE	0.44	0.42	0.44	0.87
Tmed, Hu, Ra (Combination 5)	Coefficient of correlation	0.88	0.87	0.88	0.87
	R2 correlation	0.78	0.76	0.78	0.77
	RMSE	0.29	0.31	0.29	0.58
Tmed, Hu, Vel (Combination 6)	Coefficient of correlation	0.85	0.85	0.85	0.83
	R2 correlation	0.73	0.72	0.73	0.69
	RMSE	0.32	0.33	0.32	0.65
Tmed, Ra, Vel (Combination 4)	Coefficient of correlation	0.99	0.99	0.99	0.99
	R2 correlation	0.98	0.98	0.98	0.98
	RMSE	0.09	0.09	0.09	0.53
Tmax, Tmed, Tmin (Combination 10)	Coefficient of correlation	0.80	0.78	0.80	0.79
	R2 correlation	0.63	0.61	0.63	0.63
	RMSE	0.38	0.39	0.38	0.67
Tmax, Tmedia, Hu (Combination 12)	Coefficient of correlation	0.80	0.80	0.80	0.79
	R2 correlation	0.63	0.64	0.63	0.63
	RMSE	0.38	0.37	0.38	0.65
Tmax, Hu, Ra (Combination 2)	Coefficient of correlation	0.88	0.87	0.88	0.87
	R2 correlation	0.78	0.76	0.78	0.76
	RMSE	0.29	0.30	0.29	0.67
Tmax, Hu, Vel (Combination 3)	Coefficient of correlation	0.94	0.91	0.94	0.90
	R2 correlation	0.88	0.83	0.88	0.82
	RMSE	0.22	0.26	0.22	0.66
Tmax, Ra, Vel (Combination 1)	Coefficient of correlation	0.99	0.99	0.99	0.99
	R2 correlation	0.99	0.98	0.99	0.98
	RMSE	0.07	0.08	0.07	0.57