Nitrogen content of soil 0.35032 Precipitation during the hottest quarter 0.378492 Precipitation during the coldest quarter 0.5551 Elevation 0.57939 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.582561 Ratio of precipitation to potential evapotranspiration 0.590642 Compound topographic index (relative wetness) 0.644537 Precipitation during the driest quarter 0.680878 Available water holding capacity of soil 0.847583 Precipitation during the wettest quarter 0.914396 Solar interception 1.01395 Carbon content of soil 1.09684 Temperature during the hottest quarter 1.15556 Bulk density of soil 1.29247 Sum of monthly Tavg where Tavg >=5 deg C 1.45288 Temperature during the coldest quarter 3.80617 Day/night diurnal temperature difference 4.27195