Precipitation during the wettest quarter 0 Precipitation during the driest quarter 0.542237 Nitrogen content of soil 0.543177 Compound topographic index (relative wetness) 0.68174 Precipitation during the hottest quarter 0.85203 Temperature during the hottest quarter 0.92944 Elevation 0.99382 Precipitation during the coldest quarter 1.12946 Day/night diurnal temperature difference 1.74018 Solar interception 1.84593 Ratio of precipitation to potential evapotranspiration 1.97605 Carbon content of soil 2.20501 Sum of monthly Tavg where Tavg >=5 deg C 2.25342 Bulk density of soil 2.37877 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 2.72969 Temperature during the coldest quarter 3.75314 Available water holding capacity of soil 4.11703