Nitrogen content of soil 0.929737 Sum of monthly Tavg where Tavg >=5 deg C 1.03499 Precipitation during the driest quarter 1.05517 Carbon content of soil 1.1553 Day/night diurnal temperature difference 1.23031 Precipitation during the wettest quarter 1.53639 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.71138 Bulk density of soil 1.92193 Compound topographic index (relative wetness) 2.55208 Available water holding capacity of soil 2.68624 Ratio of precipitation to potential evapotranspiration 3.49704 Temperature during the coldest quarter 3.7027 Temperature during the hottest quarter 3.78104 Precipitation during the coldest quarter 3.9966 Solar interception 4.45202 Precipitation during the hottest quarter 5.1005