Precipitation during the driest quarter 0.4939 Carbon content of soil 0.893922 Precipitation during the wettest quarter 0.952251 Nitrogen content of soil 1.00297 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.11039 Precipitation during the hottest quarter 1.17654 Precipitation during the coldest quarter 1.24036 Temperature during the hottest quarter 1.32523 Compound topographic index (relative wetness) 1.65576 Ratio of precipitation to potential evapotranspiration 1.97334 Temperature during the coldest quarter 2.1569 Day/night diurnal temperature difference 2.44908 Sum of monthly Tavg where Tavg >=5 deg C 3.68753 Available water holding capacity of soil 5.89754 Bulk density of soil 6.13121 Solar interception 9.78895