Precipitation during the wettest quarter 0.000278 Solar interception 0.120951 Precipitation during the driest quarter 0.350598 Carbon content of soil 0.35289 Nitrogen content of soil 0.426369 Day/night diurnal temperature difference 0.469707 Bulk density of soil 0.833 Sum of monthly Tavg where Tavg >=5 deg C 0.948263 Available water holding capacity of soil 1.42758 Temperature during the hottest quarter 1.56532 Temperature during the coldest quarter 1.6886 Ratio of precipitation to potential evapotranspiration 2.15736 Compound topographic index (relative wetness) 2.57827 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 2.79528 Precipitation during the hottest quarter 3.51684 Precipitation during the coldest quarter 3.78936