Carbon content of soil 0.540587 Day/night diurnal temperature difference 0.581611 Sum of monthly Tavg where Tavg >=5 deg C 0.584374 Precipitation during the wettest quarter 0.798231 Precipitation during the driest quarter 0.941907 Nitrogen content of soil 0.946596 Solar interception 1.20878 Precipitation during the coldest quarter 1.26727 Precipitation during the hottest quarter 1.3037 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.30905 Ratio of precipitation to potential evapotranspiration 1.52866 Available water holding capacity of soil 1.64187 Temperature during the hottest quarter 1.65186 Bulk density of soil 1.84487 Compound topographic index (relative wetness) 1.849 Temperature during the coldest quarter 4.02985