Carbon content of soil 0.93333 Nitrogen content of soil 0.983185 Sum of monthly Tavg where Tavg >=5 deg C 1.08092 Precipitation during the driest quarter 1.14492 Precipitation during the wettest quarter 1.1504 Day/night diurnal temperature difference 1.16322 Bulk density of soil 1.96803 Ratio of precipitation to potential evapotranspiration 2.15952 Available water holding capacity of soil 2.19849 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 2.30721 Compound topographic index (relative wetness) 2.58024 Temperature during the hottest quarter 2.60606 Solar interception 3.03644 Precipitation during the hottest quarter 4.08397 Precipitation during the coldest quarter 4.28164 Temperature during the coldest quarter 5.24551