Precipitation during the hottest quarter 0.055935 Carbon content of soil 0.129227 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.159792 Precipitation during the coldest quarter 0.180003 Temperature during the hottest quarter 0.222295 Compound topographic index (relative wetness) 0.239662 Ratio of precipitation to potential evapotranspiration 0.333886 Precipitation during the wettest quarter 0.350086 Precipitation during the driest quarter 0.371453 Day/night diurnal temperature difference 0.45805 Nitrogen content of soil 0.524558 Sum of monthly Tavg where Tavg >=5 deg C 1.42848 Bulk density of soil 1.44707 Temperature during the coldest quarter 1.76844 Available water holding capacity of soil 2.54326 Solar interception 2.85792