Precipitation during the wettest quarter 0.109308 Solar interception 0.19734 Carbon content of soil 0.352304 Nitrogen content of soil 0.360233 Precipitation during the driest quarter 0.410812 Sum of monthly Tavg where Tavg >=5 deg C 0.512445 Bulk density of soil 0.618274 Day/night diurnal temperature difference 0.80651 Precipitation during the hottest quarter 0.879835 Available water holding capacity of soil 0.99549 Precipitation during the coldest quarter 1.25217 Temperature during the hottest quarter 1.28249 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.31596 Ratio of precipitation to potential evapotranspiration 1.53605 Compound topographic index (relative wetness) 1.86315 Temperature during the coldest quarter 2.71453