Sum of monthly Tavg where Tavg >=5 deg C 0.451826 Precipitation during the driest quarter 0.535079 Carbon content of soil 0.723843 Precipitation during the wettest quarter 0.8149 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.848579 Nitrogen content of soil 0.862806 Available water holding capacity of soil 1.19374 Day/night diurnal temperature difference 1.26276 Temperature during the hottest quarter 1.63302 Bulk density of soil 1.74243 Ratio of precipitation to potential evapotranspiration 2.27613 Compound topographic index (relative wetness) 2.55208 Precipitation during the hottest quarter 3.18111 Temperature during the coldest quarter 3.75835 Precipitation during the coldest quarter 3.84441 Solar interception 5.16743