Temperature during the hottest quarter 0.302176 Day/night diurnal temperature difference 0.364011 Bulk density of soil 0.406449 Sum of monthly Tavg where Tavg >=5 deg C 0.56855 Compound topographic index (relative wetness) 0.712408 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.792627 Nitrogen content of soil 0.806775 Elevation 0.813818 Carbon content of soil 1.00876 Precipitation during the driest quarter 1.15137 Precipitation during the wettest quarter 1.22091 Solar interception 1.2798 Precipitation during the coldest quarter 1.31809 Precipitation during the hottest quarter 1.35614 Ratio of precipitation to potential evapotranspiration 1.41958 Available water holding capacity of soil 1.71955 Temperature during the coldest quarter 3.36104