Carbon content of soil 0.978599 Precipitation during the driest quarter 1.09557 Nitrogen content of soil 1.33419 Precipitation during the coldest quarter 1.40591 Precipitation during the hottest quarter 1.8691 Temperature during the coldest quarter 1.9574 Compound topographic index (relative wetness) 1.96426 Day/night diurnal temperature difference 2.05831 Precipitation during the wettest quarter 2.07917 Ratio of precipitation to potential evapotranspiration 2.2988 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 3.48984 Sum of monthly Tavg where Tavg >=5 deg C 3.84517 Temperature during the hottest quarter 4.84634 Available water holding capacity of soil 6.53314 Bulk density of soil 6.68609 Solar interception 7.42203