Compound topographic index (relative wetness) 1.2303 Precipitation during the wettest quarter 1.26461 Precipitation during the driest quarter 1.41284 Nitrogen content of soil 1.441 Elevation 1.47075 Carbon content of soil 1.70778 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 2.37167 Bulk density of soil 2.56609 Solar interception 2.93604 Sum of monthly Tavg where Tavg >=5 deg C 3.03245 Available water holding capacity of soil 3.184 Temperature during the hottest quarter 3.29903 Precipitation during the coldest quarter 3.70377 Precipitation during the hottest quarter 4.14265 Ratio of precipitation to potential evapotranspiration 4.34139 Temperature during the coldest quarter 4.7958 Day/night diurnal temperature difference 5.81555