Sum of monthly Tavg where Tavg >=5 deg C 0.829748 Available water holding capacity of soil 0.888055 Carbon content of soil 1.01333 Temperature during the hottest quarter 1.07617 Ratio of precipitation to potential evapotranspiration 1.16597 Precipitation during the driest quarter 1.28841 Nitrogen content of soil 1.29905 Precipitation during the coldest quarter 1.3815 Bulk density of soil 1.67121 Compound topographic index (relative wetness) 1.67797 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.7282 Precipitation during the wettest quarter 1.85277 Precipitation during the hottest quarter 1.8544 Day/night diurnal temperature difference 2.59424 Temperature during the coldest quarter 2.72729 Solar interception 11.3023