Sum of monthly Tavg where Tavg >=5 deg C 0.175492
Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.239345
Precipitation during the hottest quarter 0.312362
Carbon content of soil 0.345003
Available water holding capacity of soil 0.410011
Solar interception 0.434216
Precipitation during the driest quarter 0.476197
Precipitation during the wettest quarter 0.554814
Nitrogen content of soil 0.555555
Day/night diurnal temperature difference 0.561543
Temperature during the hottest quarter 0.611585
Bulk density of soil 0.65415
Ratio of precipitation to potential evapotranspiration 0.688011
Precipitation during the coldest quarter 0.720656
Compound topographic index (relative wetness) 1.49775
Temperature during the coldest quarter 2.24548