Carbon content of soil 0.222992 Precipitation during the hottest quarter 0.27489 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.307992 Precipitation during the wettest quarter 0.383437 Temperature during the hottest quarter 0.402034 Precipitation during the coldest quarter 0.50307 Precipitation during the driest quarter 0.668097 Nitrogen content of soil 0.767774 Compound topographic index (relative wetness) 0.884483 Ratio of precipitation to potential evapotranspiration 0.95315 Day/night diurnal temperature difference 1.11537 Temperature during the coldest quarter 1.40022 Sum of monthly Tavg where Tavg >=5 deg C 1.97988 Bulk density of soil 2.20518 Available water holding capacity of soil 3.04744 Solar interception 3.82074