Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.298425 Carbon content of soil 0.324107 Temperature during the hottest quarter 0.410594 Precipitation during the hottest quarter 0.479112 Precipitation during the driest quarter 0.576517 Precipitation during the wettest quarter 0.683674 Nitrogen content of soil 0.9643 Precipitation during the coldest quarter 0.984424 Compound topographic index (relative wetness) 1.11623 Day/night diurnal temperature difference 1.39142 Ratio of precipitation to potential evapotranspiration 1.44402 Temperature during the coldest quarter 1.53495 Sum of monthly Tavg where Tavg >=5 deg C 1.56725 Bulk density of soil 1.94395 Available water holding capacity of soil 2.7624 Solar interception 8.72671