Precipitation during the driest quarter 1.39731 Nitrogen content of soil 1.47936 Carbon content of soil 1.74042 Precipitation during the wettest quarter 2.31083 Compound topographic index (relative wetness) 2.44498 Temperature during the coldest quarter 2.62399 Ratio of precipitation to potential evapotranspiration 2.73929 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 3.21147 Day/night diurnal temperature difference 3.76143 Precipitation during the hottest quarter 3.80909 Precipitation during the coldest quarter 3.85691 Sum of monthly Tavg where Tavg >=5 deg C 4.30851 Temperature during the hottest quarter 5.06067 Bulk density of soil 7.07673 Available water holding capacity of soil 7.40485 Solar interception 9.91735