Precipitation during the wettest quarter 0 Nitrogen content of soil 0.19036 Precipitation during the driest quarter 0.20355 Day/night diurnal temperature difference 0.299577 Temperature during the hottest quarter 0.343748 Compound topographic index (relative wetness) 0.375591 Carbon content of soil 0.60807 Precipitation during the hottest quarter 0.709448 Bulk density of soil 0.952516 Sum of monthly Tavg where Tavg >=5 deg C 1.04914 Precipitation during the coldest quarter 1.05972 Solar interception 1.31194 Elevation 1.70357 Available water holding capacity of soil 1.72906 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 2.28179 Temperature during the coldest quarter 2.32445 Ratio of precipitation to potential evapotranspiration 2.49705