Nitrogen content of soil 0.475638 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.721025 Precipitation during the wettest quarter 0.741034 Temperature during the hottest quarter 0.784491 Day/night diurnal temperature difference 0.814584 Ratio of precipitation to potential evapotranspiration 0.825491 Compound topographic index (relative wetness) 0.828687 Precipitation during the driest quarter 0.897252 Elevation 0.996557 Solar interception 1.00469 Precipitation during the coldest quarter 1.08522 Available water holding capacity of soil 1.14439 Bulk density of soil 1.20462 Precipitation during the hottest quarter 1.38992 Carbon content of soil 1.43014 Sum of monthly Tavg where Tavg >=5 deg C 1.98735 Temperature during the coldest quarter 3.73434