Day/night diurnal temperature difference 0.085232 Temperature during the hottest quarter 0.293623 Compound topographic index (relative wetness) 0.435975 Nitrogen content of soil 0.668567 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.710962 Precipitation during the wettest quarter 0.716808 Carbon content of soil 0.718339 Precipitation during the driest quarter 0.897895 Bulk density of soil 1.06031 Elevation 1.10697 Sum of monthly Tavg where Tavg >=5 deg C 1.36266 Available water holding capacity of soil 1.76154 Solar interception 2.79015 Precipitation during the coldest quarter 3.68218 Temperature during the coldest quarter 3.7311 Precipitation during the hottest quarter 3.92491 Ratio of precipitation to potential evapotranspiration 4.31318