Compound topographic index (relative wetness) 0.696634 Precipitation during the wettest quarter 0.767646 Nitrogen content of soil 0.855709 Day/night diurnal temperature difference 0.990463 Precipitation during the driest quarter 1.0373 Elevation 1.07496 Precipitation during the coldest quarter 1.41166 Precipitation during the hottest quarter 1.45866 Sum of monthly Tavg where Tavg >=5 deg C 1.469 Carbon content of soil 1.51205 Ratio of precipitation to potential evapotranspiration 1.52322 Bulk density of soil 1.59851 Temperature during the hottest quarter 1.80928 Solar interception 1.98194 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 2.08832 Available water holding capacity of soil 2.24619 Temperature during the coldest quarter 2.9001