Sum of monthly Tavg where Tavg >=5 deg C 0.598223 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.676683 Bulk density of soil 0.69998 Nitrogen content of soil 0.825034 Solar interception 0.900685 Precipitation during the driest quarter 0.912539 Carbon content of soil 0.919191 Day/night diurnal temperature difference 1.19205 Precipitation during the wettest quarter 1.19402 Precipitation during the hottest quarter 1.33394 Precipitation during the coldest quarter 1.37837 Ratio of precipitation to potential evapotranspiration 1.58523 Compound topographic index (relative wetness) 1.68661 Available water holding capacity of soil 1.96803 Temperature during the hottest quarter 2.077 Temperature during the coldest quarter 4.10613