Precipitation during the wettest quarter 0.100564 Nitrogen content of soil 0.199211 Precipitation during the hottest quarter 0.29287 Temperature during the hottest quarter 0.368386 Available water holding capacity of soil 0.480624 Precipitation during the coldest quarter 0.487898 Precipitation during the driest quarter 0.585143 Sum of monthly Tavg where Tavg >=5 deg C 0.718285 Day/night diurnal temperature difference 0.850764 Ratio of precipitation to potential evapotranspiration 0.934621 Solar interception 1.04866 Compound topographic index (relative wetness) 1.08488 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.86536 Carbon content of soil 1.96417 Temperature during the coldest quarter 2.53144 Elevation 2.55257 Bulk density of soil 3.00394