Day/night diurnal temperature difference 0.157768 Temperature during the hottest quarter 0.316258 Compound topographic index (relative wetness) 0.563876 Nitrogen content of soil 0.591205 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.726676 Precipitation during the wettest quarter 0.728409 Precipitation during the driest quarter 0.829023 Elevation 0.832369 Carbon content of soil 0.874639 Sum of monthly Tavg where Tavg >=5 deg C 1.25785 Bulk density of soil 1.38483 Precipitation during the coldest quarter 1.44451 Precipitation during the hottest quarter 1.45827 Ratio of precipitation to potential evapotranspiration 1.54213 Solar interception 1.87206 Available water holding capacity of soil 1.97134 Temperature during the coldest quarter 5.67628