Carbon content of soil 0.489042 Precipitation during the hottest quarter 0.565702 Precipitation during the coldest quarter 0.746851 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.751355 Precipitation during the driest quarter 0.829019 Nitrogen content of soil 0.921928 Temperature during the hottest quarter 1.13784 Compound topographic index (relative wetness) 1.30302 Precipitation during the wettest quarter 1.38857 Ratio of precipitation to potential evapotranspiration 1.57517 Day/night diurnal temperature difference 1.7845 Sum of monthly Tavg where Tavg >=5 deg C 2.82234 Temperature during the coldest quarter 2.83802 Bulk density of soil 3.55605 Available water holding capacity of soil 4.46282 Solar interception 5.14782