Carbon content of soil 0.530144 Nitrogen content of soil 0.549854 Sum of monthly Tavg where Tavg >=5 deg C 0.623258 Precipitation during the hottest quarter 0.651446 Precipitation during the coldest quarter 0.674519 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.734606 Bulk density of soil 0.777966 Ratio of precipitation to potential evapotranspiration 0.789678 Precipitation during the driest quarter 0.814859 Day/night diurnal temperature difference 0.966994 Solar interception 1.0087 Compound topographic index (relative wetness) 1.16691 Precipitation during the wettest quarter 1.25699 Temperature during the hottest quarter 1.80889 Available water holding capacity of soil 1.84815 Temperature during the coldest quarter 3.53871