Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.936159 Nitrogen content of soil 0.946429 Compound topographic index (relative wetness) 0.983716 Temperature during the hottest quarter 1.2085 Precipitation during the wettest quarter 1.22091 Precipitation during the driest quarter 1.29697 Elevation 1.3231 Bulk density of soil 1.50339 Carbon content of soil 1.91868 Available water holding capacity of soil 1.9826 Sum of monthly Tavg where Tavg >=5 deg C 2.01515 Day/night diurnal temperature difference 3.41235 Solar interception 3.49793 Precipitation during the coldest quarter 3.98267 Temperature during the coldest quarter 4.42826 Ratio of precipitation to potential evapotranspiration 4.9537 Precipitation during the hottest quarter 6.61816