Carbon content of soil 0.289669 Precipitation during the hottest quarter 0.308595 Day/night diurnal temperature difference 0.433039 Ratio of precipitation to potential evapotranspiration 0.437264 Solar interception 0.440456 Sum of monthly Tavg where Tavg >=5 deg C 0.44918 Nitrogen content of soil 0.510984 Precipitation during the driest quarter 0.606015 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.613584 Precipitation during the coldest quarter 0.613732 Precipitation during the wettest quarter 0.753251 Compound topographic index (relative wetness) 0.887599 Available water holding capacity of soil 0.96131 Bulk density of soil 1.12474 Temperature during the hottest quarter 1.18441 Temperature during the coldest quarter 2.21337