Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.477065 Carbon content of soil 0.702563 Temperature during the hottest quarter 0.706962 Precipitation during the driest quarter 1.04461 Nitrogen content of soil 1.10921 Precipitation during the wettest quarter 1.43174 Day/night diurnal temperature difference 1.57802 Sum of monthly Tavg where Tavg >=5 deg C 2.17255 Compound topographic index (relative wetness) 2.20551 Ratio of precipitation to potential evapotranspiration 2.38889 Bulk density of soil 2.70412 Temperature during the coldest quarter 2.76436 Precipitation during the hottest quarter 3.22889 Available water holding capacity of soil 3.3977 Precipitation during the coldest quarter 3.70281 Solar interception 9.40854