Precipitation during the wettest quarter 0
Day/night diurnal temperature difference 0.00586
Compound topographic index (relative wetness) 0.01138
Temperature during the hottest quarter 0.019548
Ratio of precipitation to potential evapotranspiration 0.10618
Carbon content of soil 0.128019
Precipitation during the coldest quarter 0.136126
Precipitation during the driest quarter 0.156563
Sum of monthly Tavg where Tavg >=5 deg C 0.160824
Nitrogen content of soil 0.204333
Bulk density of soil 0.224209
Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.244939
Temperature during the coldest quarter 0.446246
Elevation 0.517553
Precipitation during the hottest quarter 0.556864
Solar interception 0.559521
Available water holding capacity of soil 0.7277