Temperature during the hottest quarter 0.630251 Compound topographic index (relative wetness) 0.698204 Precipitation during the wettest quarter 0.751265 Nitrogen content of soil 0.792757 Day/night diurnal temperature difference 1.00446 Precipitation during the driest quarter 1.03266 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.07861 Elevation 1.36442 Carbon content of soil 1.36838 Sum of monthly Tavg where Tavg >=5 deg C 1.73807 Bulk density of soil 1.75969 Available water holding capacity of soil 2.58712 Solar interception 3.49793 Precipitation during the coldest quarter 4.02682 Ratio of precipitation to potential evapotranspiration 4.9537 Temperature during the coldest quarter 5.65703 Precipitation during the hottest quarter 6.61816