Carbon content of soil 0.803581 Precipitation during the wettest quarter 0.882319 Nitrogen content of soil 0.941915 Sum of monthly Tavg where Tavg >=5 deg C 1.03413 Precipitation during the driest quarter 1.14144 Day/night diurnal temperature difference 1.31957 Available water holding capacity of soil 1.40945 Temperature during the hottest quarter 1.56547 Bulk density of soil 1.64807 Solar interception 2.16479 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 2.17815 Compound topographic index (relative wetness) 3.49793 Precipitation during the coldest quarter 4.0095 Ratio of precipitation to potential evapotranspiration 4.9537 Temperature during the coldest quarter 5.35466 Precipitation during the hottest quarter 6.61816