Carbon content of soil 0.975164 Precipitation during the coldest quarter 0.993704 Temperature during the hottest quarter 1.10108 Available water holding capacity of soil 1.2025 Precipitation during the hottest quarter 1.25997 Precipitation during the driest quarter 1.30011 Nitrogen content of soil 1.35286 Compound topographic index (relative wetness) 1.46206 Bulk density of soil 1.77772 Ratio of precipitation to potential evapotranspiration 1.82433 Sum of monthly Tavg where Tavg >=5 deg C 1.90789 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.91172 Precipitation during the wettest quarter 1.97375 Day/night diurnal temperature difference 3.37648 Temperature during the coldest quarter 4.05667 Solar interception 9.35315