Nitrogen content of soil 0.278444 Precipitation during the hottest quarter 0.342161 Precipitation during the coldest quarter 0.435781 Ratio of precipitation to potential evapotranspiration 0.437735 Elevation 0.451942 Precipitation during the driest quarter 0.573167 Compound topographic index (relative wetness) 0.598419 Precipitation during the wettest quarter 0.727255 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.788761 Solar interception 0.903017 Temperature during the hottest quarter 1.00474 Available water holding capacity of soil 1.22646 Carbon content of soil 1.24712 Bulk density of soil 1.57957 Temperature during the coldest quarter 1.93664 Sum of monthly Tavg where Tavg >=5 deg C 2.02691 Day/night diurnal temperature difference 3.28546