Sum of monthly Tavg where Tavg >=5 deg C 1.03499 Nitrogen content of soil 1.09665 Precipitation during the driest quarter 1.36253 Carbon content of soil 1.44775 Day/night diurnal temperature difference 1.52078 Precipitation during the wettest quarter 1.53756 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.77326 Bulk density of soil 2.27358 Compound topographic index (relative wetness) 2.59665 Available water holding capacity of soil 2.68624 Ratio of precipitation to potential evapotranspiration 3.49704 Temperature during the hottest quarter 3.78104 Precipitation during the coldest quarter 4.0095 Solar interception 4.60288 Precipitation during the hottest quarter 5.16621 Temperature during the coldest quarter 5.61585