Table 2.

The observed vs. modelled number of days with natural snow cover (≥ 1 cm) for the calibration (1981–1987) and for the validation period (1988–2010) at the stations Andermatt and Sedrun. R² is the coefficient of determination for the respective period

	Days with snow cover
	observed	modelled	R2
Andermatt
calibration	167.7	166.9	0.89
validation	160.3	163.0	0.83
Sedrun
calibration	159.1	159.9	0.85
validation	150.3	155.0	0.73