Precipitation during the wettest quarter 0 Carbon content of soil 0.515512 Precipitation during the driest quarter 0.824196 Precipitation during the hottest quarter 0.831166 Nitrogen content of soil 0.841923 Day/night diurnal temperature difference 0.976918 Precipitation during the coldest quarter 1.1202 Compound topographic index (relative wetness) 1.82666 Ratio of precipitation to potential evapotranspiration 1.96507 Solar interception 2.01415 Temperature during the hottest quarter 2.03968 Available water holding capacity of soil 2.25564 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 2.71052 Bulk density of soil 3.26828 Temperature during the coldest quarter 3.38091 Sum of monthly Tavg where Tavg >=5 deg C 3.47791