Bulk density of soil 0.619128 Sum of monthly Tavg where Tavg >=5 deg C 0.780667 Precipitation during the hottest quarter 0.878436 Precipitation during the coldest quarter 1.07861 Nitrogen content of soil 1.20614 Compound topographic index (relative wetness) 1.39316 Precipitation during the driest quarter 1.45121 Precipitation during the wettest quarter 1.5321 Carbon content of soil 1.63974 Solar interception 1.64509 Ratio of precipitation to potential evapotranspiration 1.71187 Available water holding capacity of soil 2.12844 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 2.16169 Temperature during the coldest quarter 2.38268 Elevation 2.67319 Temperature during the hottest quarter 2.97514 Day/night diurnal temperature difference 7.9256