Sum of monthly Tavg where Tavg >=5 deg C 0.965327 Carbon content of soil 1.3564 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.6035 Day/night diurnal temperature difference 1.60607 Precipitation during the driest quarter 1.61123 Nitrogen content of soil 1.62698 Precipitation during the wettest quarter 1.91093 Available water holding capacity of soil 2.34112 Bulk density of soil 2.34311 Compound topographic index (relative wetness) 2.58024 Temperature during the hottest quarter 3.12579 Ratio of precipitation to potential evapotranspiration 3.49704 Precipitation during the coldest quarter 3.98517 Temperature during the coldest quarter 4.08035 Precipitation during the hottest quarter 5.1005 Solar interception 5.45486