Precipitation during the hottest quarter 1.18295 Nitrogen content of soil 1.27954 Precipitation during the coldest quarter 1.40866 Precipitation during the wettest quarter 1.45829 Carbon content of soil 1.69419 Bulk density of soil 1.70023 Day/night diurnal temperature difference 1.8147 Available water holding capacity of soil 1.82871 Compound topographic index (relative wetness) 1.85965 Precipitation during the driest quarter 1.96649 Ratio of precipitation to potential evapotranspiration 1.9754 Temperature during the coldest quarter 2.05243 Temperature during the hottest quarter 2.59833 Solar interception 2.60357 Sum of monthly Tavg where Tavg >=5 deg C 4.578 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 4.94004