Sum of monthly Tavg where Tavg >=5 deg C 0.554874 Available water holding capacity of soil 0.689012 Ratio of precipitation to potential evapotranspiration 0.703561 Precipitation during the coldest quarter 0.725595 Carbon content of soil 0.8321 Temperature during the hottest quarter 0.839011 Precipitation during the hottest quarter 0.923224 Nitrogen content of soil 1.04937 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.07332 Compound topographic index (relative wetness) 1.12559 Bulk density of soil 1.20922 Precipitation during the driest quarter 1.23713 Temperature during the coldest quarter 1.42801 Day/night diurnal temperature difference 1.4674 Precipitation during the wettest quarter 1.68104 Solar interception 4.92663