Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.02305 Temperature during the hottest quarter 0.031832 Precipitation during the hottest quarter 0.063877 Precipitation during the wettest quarter 0.066731 Carbon content of soil 0.076151 Precipitation during the driest quarter 0.088018 Temperature during the coldest quarter 0.13932 Precipitation during the coldest quarter 0.256631 Solar interception 0.33492 Nitrogen content of soil 0.356942 Day/night diurnal temperature difference 0.430465 Ratio of precipitation to potential evapotranspiration 0.536473 Sum of monthly Tavg where Tavg >=5 deg C 0.761687 Compound topographic index (relative wetness) 0.843273 Bulk density of soil 1.04511 Available water holding capacity of soil 1.30317