Precipitation during the coldest quarter 0.223291 Precipitation during the hottest quarter 0.265346 Carbon content of soil 0.272046 Nitrogen content of soil 0.351613 Sum of monthly Tavg where Tavg >=5 deg C 0.411548 Precipitation during the driest quarter 0.417359 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.553795 Day/night diurnal temperature difference 0.618657 Bulk density of soil 0.638922 Precipitation during the wettest quarter 0.645144 Ratio of precipitation to potential evapotranspiration 0.700083 Compound topographic index (relative wetness) 1.04601 Solar interception 1.20002 Temperature during the hottest quarter 1.30948 Available water holding capacity of soil 1.37353 Temperature during the coldest quarter 2.27807