Compound topographic index (relative wetness) 0.647795 Nitrogen content of soil 0.678988 Precipitation during the wettest quarter 0.767316 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.844232 Precipitation during the driest quarter 0.90372 Ratio of precipitation to potential evapotranspiration 0.926841 Precipitation during the coldest quarter 1.00916 Day/night diurnal temperature difference 1.14239 Solar interception 1.31913 Available water holding capacity of soil 1.36104 Precipitation during the hottest quarter 1.37865 Carbon content of soil 1.41282 Temperature during the hottest quarter 1.89695 Bulk density of soil 2.0798 Temperature during the coldest quarter 2.38893 Sum of monthly Tavg where Tavg >=5 deg C 2.43545 Elevation 2.5427