Temperature during the coldest quarter 0.46428 Bulk density of soil 0.510938 Ratio of precipitation to potential evapotranspiration 0.629536 Precipitation during the coldest quarter 0.675007 Sum of monthly Tavg where Tavg >=5 deg C 0.748158 Elevation 0.91208 Solar interception 1.01237 Precipitation during the hottest quarter 1.06037 Nitrogen content of soil 1.11377 Carbon content of soil 1.32108 Compound topographic index (relative wetness) 1.33117 Precipitation during the wettest quarter 1.42407 Available water holding capacity of soil 1.4278 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.42983 Precipitation during the driest quarter 1.81044 Temperature during the hottest quarter 2.67292 Day/night diurnal temperature difference 4.94756