Nitrogen content of soil 0.850192 Sum of monthly Tavg where Tavg >=5 deg C 1.23159 Precipitation during the driest quarter 1.35833 Precipitation during the wettest quarter 1.45116 Compound topographic index (relative wetness) 1.4672 Available water holding capacity of soil 1.69789 Temperature during the coldest quarter 1.82449 Elevation 2.32659 Solar interception 2.39487 Ratio of precipitation to potential evapotranspiration 2.40022 Temperature during the hottest quarter 2.66265 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 3.11583 Precipitation during the hottest quarter 3.30143 Carbon content of soil 3.76387 Precipitation during the coldest quarter 3.81491 Bulk density of soil 4.97558 Day/night diurnal temperature difference 9.94397