Temperature during the coldest quarter 0.2419 Precipitation during the coldest quarter 0.337063 Nitrogen content of soil 0.350567 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.372103 Precipitation during the driest quarter 0.405923 Precipitation during the wettest quarter 0.460121 Precipitation during the hottest quarter 0.48087 Bulk density of soil 0.534881 Ratio of precipitation to potential evapotranspiration 0.591322 Available water holding capacity of soil 0.622218 Sum of monthly Tavg where Tavg >=5 deg C 0.652731 Solar interception 0.741654 Compound topographic index (relative wetness) 0.772471 Carbon content of soil 1.20185 Elevation 1.30413 Temperature during the hottest quarter 1.32606 Day/night diurnal temperature difference 6.34133