Precipitation during the hottest quarter 0.143827 Carbon content of soil 0.31698 Precipitation during the coldest quarter 0.360427 Sum of monthly Tavg where Tavg >=5 deg C 0.463028 Ratio of precipitation to potential evapotranspiration 0.475595 Nitrogen content of soil 0.51758 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.578567 Precipitation during the driest quarter 0.616938 Day/night diurnal temperature difference 0.683959 Precipitation during the wettest quarter 0.797065 Temperature during the hottest quarter 0.83367 Compound topographic index (relative wetness) 0.907063 Bulk density of soil 0.93452 Available water holding capacity of soil 1.11433 Solar interception 1.41878 Temperature during the coldest quarter 2.47658