Nitrogen content of soil 0.803273 Precipitation during the driest quarter 1.31617 Compound topographic index (relative wetness) 1.55041 Sum of monthly Tavg where Tavg >=5 deg C 1.5962 Available water holding capacity of soil 1.78455 Precipitation during the wettest quarter 2.0041 Temperature during the coldest quarter 2.25216 Solar interception 2.43834 Ratio of precipitation to potential evapotranspiration 2.53536 Elevation 2.76672 Temperature during the hottest quarter 3.22497 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 3.37144 Precipitation during the hottest quarter 3.71201 Precipitation during the coldest quarter 3.80483 Bulk density of soil 5.60219 Carbon content of soil 6.00506 Day/night diurnal temperature difference 8.88403