Precipitation during the coldest quarter 0.680914 Ratio of precipitation to potential evapotranspiration 0.797649 Sum of monthly Tavg where Tavg >=5 deg C 0.858124 Nitrogen content of soil 1.02313 Bulk density of soil 1.10824 Compound topographic index (relative wetness) 1.18043 Precipitation during the hottest quarter 1.18305 Solar interception 1.23718 Temperature during the coldest quarter 1.4058 Precipitation during the driest quarter 1.4125 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.43686 Carbon content of soil 1.52326 Available water holding capacity of soil 1.65088 Precipitation during the wettest quarter 1.76662 Elevation 1.87944 Temperature during the hottest quarter 1.93002 Day/night diurnal temperature difference 8.91212