Day/night diurnal temperature difference 0.748751 Ratio of precipitation to potential evapotranspiration 0.767821 Compound topographic index (relative wetness) 0.844751 Precipitation during the coldest quarter 0.948714 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.961411 Nitrogen content of soil 1.00985 Precipitation during the driest quarter 1.16176 Solar interception 1.24209 Precipitation during the hottest quarter 1.2584 Precipitation during the wettest quarter 1.26461 Temperature during the hottest quarter 1.39534 Carbon content of soil 1.42299 Available water holding capacity of soil 1.7153 Elevation 1.80662 Bulk density of soil 2.51436 Sum of monthly Tavg where Tavg >=5 deg C 2.73744 Temperature during the coldest quarter 4.89746