Sum of monthly Tavg where Tavg >=5 deg C 0.655963 Available water holding capacity of soil 0.693068 Temperature during the hottest quarter 0.759042 Precipitation during the coldest quarter 0.817423 Nitrogen content of soil 0.923829 Carbon content of soil 1.00326 Bulk density of soil 1.13248 Ratio of precipitation to potential evapotranspiration 1.15015 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.16301 Precipitation during the driest quarter 1.16887 Precipitation during the wettest quarter 1.50871 Compound topographic index (relative wetness) 1.60362 Day/night diurnal temperature difference 1.7328 Precipitation during the hottest quarter 1.83916 Temperature during the coldest quarter 2.99803 Solar interception 6.61972