Day/night diurnal temperature difference 0.669772 Compound topographic index (relative wetness) 0.761835 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.898278 Nitrogen content of soil 1.11083 Temperature during the hottest quarter 1.19355 Precipitation during the driest quarter 1.21751 Precipitation during the coldest quarter 1.25787 Precipitation during the hottest quarter 1.288 Precipitation during the wettest quarter 1.30304 Carbon content of soil 1.42893 Ratio of precipitation to potential evapotranspiration 1.58659 Elevation 1.61633 Solar interception 1.62464 Available water holding capacity of soil 1.77696 Bulk density of soil 2.50739 Sum of monthly Tavg where Tavg >=5 deg C 2.72593 Temperature during the coldest quarter 4.75243