Precipitation during the coldest quarter 0.402863 Precipitation during the hottest quarter 0.536079 Ratio of precipitation to potential evapotranspiration 0.590276 Bulk density of soil 0.645571 Sum of monthly Tavg where Tavg >=5 deg C 0.692043 Nitrogen content of soil 0.855961 Compound topographic index (relative wetness) 0.922258 Precipitation during the wettest quarter 0.947239 Solar interception 0.979262 Precipitation during the driest quarter 1.00422 Temperature during the hottest quarter 1.13107 Elevation 1.19431 Available water holding capacity of soil 1.2176 Carbon content of soil 1.2434 Temperature during the coldest quarter 1.28484 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.30119 Day/night diurnal temperature difference 7.57062