Day/night diurnal temperature difference 0.117047 Carbon content of soil 0.117088 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.123524 Sum of monthly Tavg where Tavg >=5 deg C 0.140473 Precipitation during the hottest quarter 0.142171 Nitrogen content of soil 0.218793 Precipitation during the wettest quarter 0.242487 Precipitation during the driest quarter 0.2535 Bulk density of soil 0.265753 Temperature during the hottest quarter 0.27091 Available water holding capacity of soil 0.28755 Precipitation during the coldest quarter 0.394991 Ratio of precipitation to potential evapotranspiration 0.448643 Solar interception 0.555961 Compound topographic index (relative wetness) 0.910335 Temperature during the coldest quarter 1.53512