Day/night diurnal temperature difference 0.044118 Precipitation during the wettest quarter 0.251008 Temperature during the hottest quarter 0.272007 Compound topographic index (relative wetness) 0.285411 Nitrogen content of soil 0.452532 Carbon content of soil 0.477546 Precipitation during the driest quarter 0.578419 Elevation 0.624661 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.710962 Bulk density of soil 0.85879 Precipitation during the hottest quarter 1.06525 Precipitation during the coldest quarter 1.15352 Sum of monthly Tavg where Tavg >=5 deg C 1.17661 Available water holding capacity of soil 1.30643 Solar interception 1.31463 Ratio of precipitation to potential evapotranspiration 1.41998 Temperature during the coldest quarter 1.55466