Available water holding capacity of soil 0.236512 Precipitation during the coldest quarter 0.241943 Ratio of precipitation to potential evapotranspiration 0.254272 Precipitation during the hottest quarter 0.274295 Solar interception 0.314253 Sum of monthly Tavg where Tavg >=5 deg C 0.40673 Temperature during the coldest quarter 0.420894 Nitrogen content of soil 0.426908 Precipitation during the driest quarter 0.503434 Compound topographic index (relative wetness) 0.608821 Precipitation during the wettest quarter 0.677899 Carbon content of soil 0.761812 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.913054 Temperature during the hottest quarter 1.25908 Elevation 1.34714 Bulk density of soil 1.54224 Day/night diurnal temperature difference 5.81977