Precipitation during the wettest quarter 0 Day/night diurnal temperature difference 0.070549 Temperature during the hottest quarter 0.109177 Compound topographic index (relative wetness) 0.287218 Precipitation during the driest quarter 0.35911 Nitrogen content of soil 0.45104 Bulk density of soil 0.651034 Carbon content of soil 0.822032 Precipitation during the hottest quarter 0.8946 Precipitation during the coldest quarter 1.14827 Sum of monthly Tavg where Tavg >=5 deg C 1.36521 Solar interception 1.41462 Elevation 1.43339 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.51522 Ratio of precipitation to potential evapotranspiration 1.74049 Available water holding capacity of soil 2.28763 Temperature during the coldest quarter 2.84387