Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.0274 Compound topographic index (relative wetness) 1.04888 Nitrogen content of soil 1.08774 Precipitation during the driest quarter 1.23847 Elevation 1.36484 Precipitation during the wettest quarter 1.46842 Temperature during the hottest quarter 1.49172 Available water holding capacity of soil 1.71929 Ratio of precipitation to potential evapotranspiration 2.35388 Carbon content of soil 2.37134 Solar interception 2.58053 Bulk density of soil 2.65462 Sum of monthly Tavg where Tavg >=5 deg C 3.66758 Precipitation during the hottest quarter 3.79501 Precipitation during the coldest quarter 4.00523 Day/night diurnal temperature difference 5.28344 Temperature during the coldest quarter 5.48572