Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.296574 Precipitation during the driest quarter 0.333851 Available water holding capacity of soil 0.384359 Nitrogen content of soil 0.438234 Compound topographic index (relative wetness) 0.447787 Precipitation during the coldest quarter 0.448067 Precipitation during the hottest quarter 0.458065 Ratio of precipitation to potential evapotranspiration 0.460969 Precipitation during the wettest quarter 0.508675 Carbon content of soil 0.563591 Temperature during the hottest quarter 0.604162 Sum of monthly Tavg where Tavg >=5 deg C 0.7291 Elevation 0.821251 Bulk density of soil 0.827983 Day/night diurnal temperature difference 1.34142 Solar interception 1.85963 Temperature during the coldest quarter 3.14093