Day/night diurnal temperature difference 0.188491 Precipitation during the driest quarter 0.362405 Nitrogen content of soil 0.381875 Compound topographic index (relative wetness) 0.385915 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.484169 Precipitation during the wettest quarter 0.56914 Precipitation during the hottest quarter 0.580199 Precipitation during the coldest quarter 0.615256 Ratio of precipitation to potential evapotranspiration 0.70461 Temperature during the hottest quarter 0.751413 Available water holding capacity of soil 0.794814 Solar interception 0.942252 Carbon content of soil 1.12516 Elevation 1.18622 Bulk density of soil 1.52859 Sum of monthly Tavg where Tavg >=5 deg C 2.06976 Temperature during the coldest quarter 3.82488