Precipitation during the wettest quarter 0 Precipitation during the hottest quarter 0.67442 Carbon content of soil 0.748283 Nitrogen content of soil 0.926321 Compound topographic index (relative wetness) 0.994495 Precipitation during the coldest quarter 1.01852 Bulk density of soil 1.05449 Sum of monthly Tavg where Tavg >=5 deg C 1.0607 Day/night diurnal temperature difference 1.11728 Precipitation during the driest quarter 1.13461 Solar interception 1.27182 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 2.03698 Available water holding capacity of soil 2.14432 Elevation 2.47067 Ratio of precipitation to potential evapotranspiration 2.52378 Temperature during the hottest quarter 2.89488 Temperature during the coldest quarter 3.7847