Precipitation during the wettest quarter 0.03876 Precipitation during the hottest quarter 0.378611 Carbon content of soil 0.731796 Temperature during the coldest quarter 0.738069 Nitrogen content of soil 0.78858 Precipitation during the driest quarter 0.85829 Precipitation during the coldest quarter 0.887385 Ratio of precipitation to potential evapotranspiration 0.891447 Compound topographic index (relative wetness) 0.960735 Day/night diurnal temperature difference 1.2181 Sum of monthly Tavg where Tavg >=5 deg C 1.67643 Bulk density of soil 1.76582 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 2.03182 Available water holding capacity of soil 2.49927 Temperature during the hottest quarter 2.74375 Solar interception 13.4378