Precipitation during the wettest quarter 0 Solar interception 0.02712 Nitrogen content of soil 0.259589 Precipitation during the driest quarter 0.636582 Sum of monthly Tavg where Tavg >=5 deg C 0.642822 Bulk density of soil 0.681478 Carbon content of soil 0.684267 Day/night diurnal temperature difference 0.892174 Available water holding capacity of soil 1.02815 Temperature during the hottest quarter 1.06911 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.08601 Temperature during the coldest quarter 2.34336 Compound topographic index (relative wetness) 2.88735 Precipitation during the coldest quarter 3.40224 Precipitation during the hottest quarter 3.74927 Ratio of precipitation to potential evapotranspiration 4.30993