Carbon content of soil 0.247386 Precipitation during the hottest quarter 0.329551 Day/night diurnal temperature difference 0.366116 Precipitation during the coldest quarter 0.420236 Ratio of precipitation to potential evapotranspiration 0.445703 Precipitation during the driest quarter 0.454148 Nitrogen content of soil 0.524661 Precipitation during the wettest quarter 0.640739 Sum of monthly Tavg where Tavg >=5 deg C 0.757284 Compound topographic index (relative wetness) 0.907063 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.25338 Available water holding capacity of soil 1.54193 Bulk density of soil 1.55922 Temperature during the coldest quarter 1.85061 Temperature during the hottest quarter 2.01713 Solar interception 3.18407