Precipitation during the wettest quarter 0.899959 Nitrogen content of soil 1.14499 Carbon content of soil 1.27319 Day/night diurnal temperature difference 1.31957 Precipitation during the driest quarter 1.39273 Available water holding capacity of soil 1.61991 Bulk density of soil 1.92663 Temperature during the hottest quarter 2.08884 Sum of monthly Tavg where Tavg >=5 deg C 2.3413 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 2.52142 Solar interception 3.09612 Compound topographic index (relative wetness) 3.49793 Precipitation during the coldest quarter 4.01205 Ratio of precipitation to potential evapotranspiration 4.9537 Temperature during the coldest quarter 6.51502 Precipitation during the hottest quarter 6.61816