Precipitation during the hottest quarter 0.70818 Sum of monthly Tavg where Tavg >=5 deg C 0.871717 Precipitation during the driest quarter 0.939822 Precipitation during the coldest quarter 0.942335 Carbon content of soil 0.953443 Nitrogen content of soil 1.13394 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.42533 Day/night diurnal temperature difference 1.45804 Precipitation during the wettest quarter 1.48716 Ratio of precipitation to potential evapotranspiration 1.57799 Available water holding capacity of soil 1.83755 Compound topographic index (relative wetness) 1.96938 Bulk density of soil 2.02793 Temperature during the hottest quarter 2.45814 Temperature during the coldest quarter 3.01158 Solar interception 5.45486