Bulk density of soil 0.577041 Nitrogen content of soil 0.633215 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.642652 Sum of monthly Tavg where Tavg >=5 deg C 0.722664 Precipitation during the coldest quarter 0.728498 Compound topographic index (relative wetness) 0.741459 Carbon content of soil 0.747712 Precipitation during the wettest quarter 0.825662 Ratio of precipitation to potential evapotranspiration 0.853207 Precipitation during the driest quarter 1.07524 Available water holding capacity of soil 1.08469 Elevation 1.22672 Solar interception 1.25799 Precipitation during the hottest quarter 1.44626 Temperature during the hottest quarter 2.15005 Temperature during the coldest quarter 3.72088 Day/night diurnal temperature difference 5.46364