Temperature during the hottest quarter 0.725942 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.747858 Compound topographic index (relative wetness) 0.808894 Nitrogen content of soil 0.831017 Elevation 0.969227 Precipitation during the wettest quarter 1.04083 Precipitation during the driest quarter 1.09381 Carbon content of soil 1.13287 Available water holding capacity of soil 1.59782 Day/night diurnal temperature difference 1.80146 Ratio of precipitation to potential evapotranspiration 2.15955 Bulk density of soil 2.17688 Sum of monthly Tavg where Tavg >=5 deg C 2.43202 Solar interception 2.58077 Precipitation during the hottest quarter 3.51939 Precipitation during the coldest quarter 4.00523 Temperature during the coldest quarter 5.16119