Nitrogen content of soil 0.467372 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.532081 Elevation 0.541021 Temperature during the hottest quarter 0.649807 Compound topographic index (relative wetness) 0.731791 Precipitation during the wettest quarter 0.748638 Precipitation during the driest quarter 0.841645 Day/night diurnal temperature difference 0.98696 Available water holding capacity of soil 1.01563 Sum of monthly Tavg where Tavg >=5 deg C 1.22707 Carbon content of soil 1.2486 Precipitation during the coldest quarter 1.26036 Precipitation during the hottest quarter 1.30181 Ratio of precipitation to potential evapotranspiration 1.5252 Bulk density of soil 1.59768 Solar interception 1.83868 Temperature during the coldest quarter 4.03523