Precipitation during the wettest quarter 0 Day/night diurnal temperature difference 0.045517 Temperature during the hottest quarter 0.186034 Compound topographic index (relative wetness) 0.214133 Precipitation during the driest quarter 0.27259 Nitrogen content of soil 0.34562 Carbon content of soil 0.383594 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.387508 Bulk density of soil 0.517614 Sum of monthly Tavg where Tavg >=5 deg C 0.684315 Precipitation during the hottest quarter 0.858557 Precipitation during the coldest quarter 1.07289 Elevation 1.12038 Solar interception 1.13924 Available water holding capacity of soil 1.41096 Ratio of precipitation to potential evapotranspiration 1.68039 Temperature during the coldest quarter 3.00865