Precipitation during the wettest quarter 0 Day/night diurnal temperature difference 0.221616 Temperature during the hottest quarter 0.246307 Precipitation during the driest quarter 0.26912 Compound topographic index (relative wetness) 0.274625 Nitrogen content of soil 0.41833 Precipitation during the hottest quarter 0.859572 Precipitation during the coldest quarter 1.12359 Solar interception 1.5054 Elevation 1.62931 Carbon content of soil 1.66465 Temperature during the coldest quarter 2.06364 Available water holding capacity of soil 2.49615 Ratio of precipitation to potential evapotranspiration 2.59527 Bulk density of soil 3.39853 Sum of monthly Tavg where Tavg >=5 deg C 3.66828 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 4.19354