Sum of monthly Tavg where Tavg >=5 deg C 0.430809 Precipitation during the driest quarter 0.511762 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.69811 Precipitation during the wettest quarter 0.746944 Nitrogen content of soil 0.842943 Carbon content of soil 0.848644 Day/night diurnal temperature difference 1.54423 Available water holding capacity of soil 1.57031 Bulk density of soil 1.58197 Temperature during the hottest quarter 2.04803 Solar interception 2.62696 Temperature during the coldest quarter 3.7214 Precipitation during the coldest quarter 4.12802 Precipitation during the hottest quarter 5.16621 Ratio of precipitation to potential evapotranspiration 5.33467 Compound topographic index (relative wetness) 5.60487