Sum of monthly Tavg where Tavg >=5 deg C 0.48938 Precipitation during the driest quarter 0.507643 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.608278 Solar interception 0.673689 Precipitation during the wettest quarter 0.689424 Carbon content of soil 0.861369 Nitrogen content of soil 1.05919 Day/night diurnal temperature difference 1.44851 Available water holding capacity of soil 1.53606 Bulk density of soil 1.73588 Temperature during the hottest quarter 1.83482 Precipitation during the hottest quarter 3.54256 Precipitation during the coldest quarter 3.73701 Temperature during the coldest quarter 5.60994 Ratio of precipitation to potential evapotranspiration 7.06269 Compound topographic index (relative wetness) 7.36347