Precipitation during the driest quarter 1.08607 Compound topographic index (relative wetness) 1.10585 Nitrogen content of soil 1.30671 Carbon content of soil 1.59467 Precipitation during the wettest quarter 1.72012 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.76258 Solar interception 1.83844 Available water holding capacity of soil 1.90362 Elevation 2.14829 Sum of monthly Tavg where Tavg >=5 deg C 2.22311 Precipitation during the coldest quarter 2.42219 Precipitation during the hottest quarter 2.55563 Ratio of precipitation to potential evapotranspiration 2.98852 Temperature during the coldest quarter 3.17142 Bulk density of soil 3.21054 Temperature during the hottest quarter 3.75864 Day/night diurnal temperature difference 6.47524