Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.712431 Temperature during the hottest quarter 0.7184 Compound topographic index (relative wetness) 0.833713 Nitrogen content of soil 0.835619 Elevation 0.987215 Precipitation during the wettest quarter 1.04083 Precipitation during the driest quarter 1.12056 Carbon content of soil 1.51607 Sum of monthly Tavg where Tavg >=5 deg C 1.74501 Bulk density of soil 1.8298 Available water holding capacity of soil 1.93501 Ratio of precipitation to potential evapotranspiration 2.15955 Day/night diurnal temperature difference 2.35357 Solar interception 2.58073 Precipitation during the hottest quarter 3.51939 Precipitation during the coldest quarter 4.24113 Temperature during the coldest quarter 4.25483