Precipitation during the hottest quarter 0.490892 Carbon content of soil 0.714501 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.870133 Nitrogen content of soil 0.914204 Precipitation during the driest quarter 0.9474 Precipitation during the coldest quarter 1.05659 Compound topographic index (relative wetness) 1.19365 Temperature during the hottest quarter 1.30028 Precipitation during the wettest quarter 1.37613 Ratio of precipitation to potential evapotranspiration 1.48957 Temperature during the coldest quarter 1.92039 Day/night diurnal temperature difference 1.98184 Sum of monthly Tavg where Tavg >=5 deg C 2.95945 Bulk density of soil 3.66612 Available water holding capacity of soil 4.66664 Solar interception 7.52655