Sum of monthly Tavg where Tavg >=5 deg C 0.427774 Precipitation during the driest quarter 0.436639 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.533329 Precipitation during the wettest quarter 0.580103 Nitrogen content of soil 0.590318 Carbon content of soil 0.811823 Day/night diurnal temperature difference 0.979614 Bulk density of soil 1.24558 Solar interception 1.31727 Available water holding capacity of soil 1.58137 Temperature during the hottest quarter 1.85408 Compound topographic index (relative wetness) 2.59665 Ratio of precipitation to potential evapotranspiration 3.49704 Temperature during the coldest quarter 3.69146 Precipitation during the coldest quarter 3.9966 Precipitation during the hottest quarter 5.16621