Precipitation during the wettest quarter 0.792277 Sum of monthly Tavg where Tavg >=5 deg C 0.852887 Bulk density of soil 0.870681 Ratio of precipitation to potential evapotranspiration 0.933192 Carbon content of soil 1.02104 Precipitation during the driest quarter 1.17587 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.18461 Precipitation during the coldest quarter 1.19206 Available water holding capacity of soil 1.22747 Nitrogen content of soil 1.23779 Compound topographic index (relative wetness) 1.27346 Precipitation during the hottest quarter 1.54799 Temperature during the hottest quarter 1.79437 Day/night diurnal temperature difference 2.93851 Solar interception 3.41351 Temperature during the coldest quarter 5.0868