Precipitation during the wettest quarter 0.06042 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.154696 Temperature during the hottest quarter 0.201578 Precipitation during the hottest quarter 0.206657 Carbon content of soil 0.242917 Precipitation during the driest quarter 0.245161 Nitrogen content of soil 0.405079 Precipitation during the coldest quarter 0.405978 Compound topographic index (relative wetness) 0.522463 Ratio of precipitation to potential evapotranspiration 0.565566 Temperature during the coldest quarter 0.611859 Bulk density of soil 0.633254 Sum of monthly Tavg where Tavg >=5 deg C 0.689572 Available water holding capacity of soil 1.10884 Day/night diurnal temperature difference 1.73537 Solar interception 2.32933