Precipitation during the hottest quarter 0.564006 Temperature during the hottest quarter 0.618731 Nitrogen content of soil 0.677855 Compound topographic index (relative wetness) 0.720773 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.735393 Ratio of precipitation to potential evapotranspiration 0.740574 Precipitation during the coldest quarter 0.768802 Precipitation during the wettest quarter 0.783278 Elevation 0.882749 Precipitation during the driest quarter 0.950621 Solar interception 1.05569 Available water holding capacity of soil 1.5455 Carbon content of soil 1.83434 Sum of monthly Tavg where Tavg >=5 deg C 2.12495 Bulk density of soil 2.17688 Day/night diurnal temperature difference 2.35357 Temperature during the coldest quarter 4.11464