Temperature during the hottest quarter 0.308375 Day/night diurnal temperature difference 0.3481 Compound topographic index (relative wetness) 0.756375 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.834132 Nitrogen content of soil 0.96275 Elevation 1.03521 Bulk density of soil 1.05335 Sum of monthly Tavg where Tavg >=5 deg C 1.06345 Carbon content of soil 1.15103 Precipitation during the wettest quarter 1.22091 Precipitation during the driest quarter 1.30511 Available water holding capacity of soil 1.72234 Solar interception 2.95716 Temperature during the coldest quarter 3.00929 Precipitation during the coldest quarter 3.40103 Precipitation during the hottest quarter 3.90427 Ratio of precipitation to potential evapotranspiration 4.30605