Temperature during the hottest quarter 0.465233 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.471733 Nitrogen content of soil 0.474365 Available water holding capacity of soil 0.537233 Precipitation during the hottest quarter 0.566846 Precipitation during the driest quarter 0.774913 Compound topographic index (relative wetness) 0.779968 Precipitation during the coldest quarter 0.806495 Ratio of precipitation to potential evapotranspiration 0.924804 Day/night diurnal temperature difference 1.02475 Carbon content of soil 1.03462 Precipitation during the wettest quarter 1.05676 Elevation 1.10816 Bulk density of soil 1.53653 Solar interception 1.64397 Sum of monthly Tavg where Tavg >=5 deg C 1.82971 Temperature during the coldest quarter 4.95609