Nitrogen content of soil 1.29449 Compound topographic index (relative wetness) 1.58065 Precipitation during the driest quarter 1.58822 Available water holding capacity of soil 1.88576 Precipitation during the wettest quarter 2.06115 Sum of monthly Tavg where Tavg >=5 deg C 2.24008 Solar interception 2.9112 Ratio of precipitation to potential evapotranspiration 3.04231 Temperature during the coldest quarter 3.36598 Precipitation during the hottest quarter 3.82856 Precipitation during the coldest quarter 3.83706 Temperature during the hottest quarter 4.08023 Elevation 4.16992 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 4.41714 Carbon content of soil 6.72993 Bulk density of soil 7.31734 Day/night diurnal temperature difference 9.80444