Carbon content of soil 1.12704 Precipitation during the driest quarter 1.36047 Temperature during the hottest quarter 1.37833 Nitrogen content of soil 1.64755 Precipitation during the wettest quarter 2.01296 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 2.07513 Compound topographic index (relative wetness) 2.44192 Ratio of precipitation to potential evapotranspiration 2.52548 Sum of monthly Tavg where Tavg >=5 deg C 2.96952 Day/night diurnal temperature difference 3.32116 Temperature during the coldest quarter 3.43286 Precipitation during the hottest quarter 3.84562 Precipitation during the coldest quarter 3.85008 Bulk density of soil 4.61884 Available water holding capacity of soil 5.14072 Solar interception 9.16007