Precipitation during the wettest quarter 0.051117 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.262411 Precipitation during the hottest quarter 0.273128 Precipitation during the coldest quarter 0.380205 Ratio of precipitation to potential evapotranspiration 0.384772 Precipitation during the driest quarter 0.427837 Temperature during the hottest quarter 0.44459 Carbon content of soil 0.477221 Sum of monthly Tavg where Tavg >=5 deg C 0.480996 Compound topographic index (relative wetness) 0.662836 Bulk density of soil 0.672856 Available water holding capacity of soil 0.743274 Nitrogen content of soil 1.24749 Temperature during the coldest quarter 1.32109 Solar interception 1.46343 Day/night diurnal temperature difference 2.80563