Precipitation during the wettest quarter 0.008401 Nitrogen content of soil 0.206995 Available water holding capacity of soil 0.212479 Precipitation during the coldest quarter 0.250929 Precipitation during the hottest quarter 0.360968 Sum of monthly Tavg where Tavg >=5 deg C 0.394545 Precipitation during the driest quarter 0.434553 Ratio of precipitation to potential evapotranspiration 0.456261 Temperature during the hottest quarter 0.470992 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.68301 Solar interception 0.706795 Carbon content of soil 0.755049 Compound topographic index (relative wetness) 0.948429 Bulk density of soil 1.18713 Day/night diurnal temperature difference 1.73692 Temperature during the coldest quarter 1.74999 Elevation 2.84