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Table I
Results of cross validation over a time span of 4018 d, with n = number of stations used for validation, r2 = coefficient of determination between measured and interpolated daily climate values, MAE = mean absolute error, PMAE = percentage mean absolute error, DTR = diurnal temperature range.
| Daily | Monthly | ||||||||
| Variable | n | r 2 | MAE | PMAE | r 2 | MAE | PMAE | ||
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| Temperature | 417 | 0.99 | 0.5 | 5.8 | 1.00 | 0.3 | 3.5 | ||
| Temperature (max.) | 417 | 0.99 | 0.6 | 4.5 | 1.00 | 0.4 | 2.8 | ||
| Temperature (min.) | 417 | 0.98 | 0.8 | 15.3 | 1.00 | 0.5 | 9.3 | ||
| DTR | 417 | 0.91 | 1.0 | 11.7 | 0.96 | 0.6 | 7.0 | ||
| Precipitation | 161 | 0.84 | 0.8 | 37.7 | 0.89 | 9.8 | 14.4 | ||
| Rel. humidity | 417 | 0.88 | 3.4 | 4.2 | 0.93 | 2.1 | 2.7 | ||
| Solar radiation | 112 | 0.97 | 10.3 | 8.6 | 0.99 | 6.1 | 5.2 | ||
| Wind speed | 417 | 0.70 | 0.9 | 36.9 | 0.72 | 0.7 | 29.2 | ||