Day/night diurnal temperature difference 0.067791 Temperature during the hottest quarter 0.205886 Nitrogen content of soil 0.488718 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.490872 Compound topographic index (relative wetness) 0.537598 Carbon content of soil 0.603503 Precipitation during the driest quarter 0.698066 Precipitation during the wettest quarter 0.700963 Elevation 0.752118 Precipitation during the hottest quarter 0.891818 Sum of monthly Tavg where Tavg >=5 deg C 1.05714 Bulk density of soil 1.15625 Precipitation during the coldest quarter 1.29321 Available water holding capacity of soil 1.38998 Ratio of precipitation to potential evapotranspiration 1.51863 Temperature during the coldest quarter 1.73707 Solar interception 1.84276