Precipitation during the wettest quarter 0.195636 Compound topographic index (relative wetness) 0.70644 Nitrogen content of soil 0.772309 Day/night diurnal temperature difference 0.814584 Precipitation during the driest quarter 0.860556 Temperature during the hottest quarter 0.928685 Carbon content of soil 1.35038 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.56656 Elevation 1.64865 Bulk density of soil 2.27662 Sum of monthly Tavg where Tavg >=5 deg C 2.53269 Available water holding capacity of soil 3.03457 Temperature during the coldest quarter 3.27873 Solar interception 3.49437 Precipitation during the coldest quarter 4.28235 Ratio of precipitation to potential evapotranspiration 4.94703 Precipitation during the hottest quarter 6.61207