Precipitation during the wettest quarter 0.005567 Carbon content of soil 0.676071 Temperature during the coldest quarter 0.822447 Precipitation during the hottest quarter 0.845072 Ratio of precipitation to potential evapotranspiration 0.886937 Precipitation during the driest quarter 0.914573 Compound topographic index (relative wetness) 0.989231 Nitrogen content of soil 1.05402 Precipitation during the coldest quarter 1.06752 Available water holding capacity of soil 1.08162 Temperature during the hottest quarter 1.60876 Day/night diurnal temperature difference 2.04854 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 2.39509 Sum of monthly Tavg where Tavg >=5 deg C 2.42965 Bulk density of soil 2.49793 Solar interception 7.77141