Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.61676 Temperature during the hottest quarter 0.663545 Nitrogen content of soil 0.720489 Compound topographic index (relative wetness) 0.763716 Elevation 0.944158 Precipitation during the driest quarter 1.00171 Available water holding capacity of soil 1.03386 Precipitation during the wettest quarter 1.1147 Carbon content of soil 1.19731 Sum of monthly Tavg where Tavg >=5 deg C 1.61158 Bulk density of soil 1.67817 Ratio of precipitation to potential evapotranspiration 2.15915 Day/night diurnal temperature difference 2.36436 Solar interception 2.58053 Precipitation during the hottest quarter 3.51939 Precipitation during the coldest quarter 4.00523 Temperature during the coldest quarter 5.08659