Solar interception 0.247781 Precipitation during the wettest quarter 0.738032 Carbon content of soil 0.905188 Nitrogen content of soil 0.972694 Day/night diurnal temperature difference 1.06016 Sum of monthly Tavg where Tavg >=5 deg C 1.11035 Precipitation during the driest quarter 1.12044 Bulk density of soil 1.27015 Available water holding capacity of soil 1.69629 Temperature during the hottest quarter 1.73537 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 2.10037 Compound topographic index (relative wetness) 2.88735 Precipitation during the coldest quarter 3.62607 Precipitation during the hottest quarter 3.86325 Ratio of precipitation to potential evapotranspiration 4.32458 Temperature during the coldest quarter 5.25189