Ratio of precipitation to potential evapotranspiration 0.194636 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.209105 Precipitation during the coldest quarter 0.259125 Compound topographic index (relative wetness) 0.267875 Precipitation during the hottest quarter 0.285571 Temperature during the hottest quarter 0.367926 Carbon content of soil 0.495246 Day/night diurnal temperature difference 0.941519 Sum of monthly Tavg where Tavg >=5 deg C 0.945089 Temperature during the coldest quarter 1.09164 Precipitation during the driest quarter 1.11597 Nitrogen content of soil 1.12106 Precipitation during the wettest quarter 1.39583 Bulk density of soil 1.40863 Available water holding capacity of soil 1.50096 Solar interception 5.29726