Carbon content of soil 0.516227 Precipitation during the wettest quarter 0.774247 Sum of monthly Tavg where Tavg >=5 deg C 0.779292 Ratio of precipitation to potential evapotranspiration 0.807841 Solar interception 0.835666 Nitrogen content of soil 0.905664 Day/night diurnal temperature difference 1.00116 Compound topographic index (relative wetness) 1.00437 Precipitation during the driest quarter 1.00894 Precipitation during the coldest quarter 1.08469 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.0926 Available water holding capacity of soil 1.23599 Precipitation during the hottest quarter 1.42998 Bulk density of soil 1.44417 Temperature during the hottest quarter 2.02954 Temperature during the coldest quarter 3.59621