Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.603876 Precipitation during the hottest quarter 0.610217 Nitrogen content of soil 0.695376 Precipitation during the coldest quarter 0.727442 Compound topographic index (relative wetness) 0.745659 Ratio of precipitation to potential evapotranspiration 0.778997 Available water holding capacity of soil 0.788892 Elevation 0.978099 Precipitation during the driest quarter 1.00063 Solar interception 1.10634 Temperature during the hottest quarter 1.19154 Precipitation during the wettest quarter 1.26461 Carbon content of soil 1.28207 Day/night diurnal temperature difference 1.75972 Bulk density of soil 2.26084 Sum of monthly Tavg where Tavg >=5 deg C 2.32669 Temperature during the coldest quarter 2.7628