Precipitation during the wettest quarter 0 Day/night diurnal temperature difference 0.04607 Temperature during the hottest quarter 0.144995 Compound topographic index (relative wetness) 0.214133 Precipitation during the hottest quarter 0.502498 Precipitation during the driest quarter 0.516586 Nitrogen content of soil 0.576326 Bulk density of soil 0.630624 Carbon content of soil 0.866368 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.917442 Precipitation during the coldest quarter 0.978976 Sum of monthly Tavg where Tavg >=5 deg C 1.071 Solar interception 1.41462 Elevation 1.63915 Ratio of precipitation to potential evapotranspiration 1.74049 Available water holding capacity of soil 1.85916 Temperature during the coldest quarter 2.24987