Precipitation during the wettest quarter 0 Precipitation during the hottest quarter 0.317545 Compound topographic index (relative wetness) 0.573063 Precipitation during the driest quarter 0.594278 Nitrogen content of soil 0.662853 Precipitation during the coldest quarter 0.766958 Carbon content of soil 0.825587 Ratio of precipitation to potential evapotranspiration 1.13082 Bulk density of soil 1.16229 Sum of monthly Tavg where Tavg >=5 deg C 1.20311 Temperature during the coldest quarter 1.20497 Available water holding capacity of soil 1.23402 Solar interception 1.24384 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.47213 Temperature during the hottest quarter 1.79566 Elevation 2.18683 Day/night diurnal temperature difference 4.82267