Precipitation during the wettest quarter 0.15067 Carbon content of soil 0.65776 Nitrogen content of soil 1.01896 Precipitation during the hottest quarter 1.03439 Precipitation during the driest quarter 1.15802 Precipitation during the coldest quarter 1.21241 Day/night diurnal temperature difference 1.23915 Ratio of precipitation to potential evapotranspiration 1.41973 Available water holding capacity of soil 1.45747 Compound topographic index (relative wetness) 1.62979 Temperature during the hottest quarter 1.80155 Sum of monthly Tavg where Tavg >=5 deg C 1.90348 Bulk density of soil 2.04845 Temperature during the coldest quarter 2.16131 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 3.17491 Solar interception 6.93375