Ratio of precipitation to potential evapotranspiration 0.723719 Precipitation during the coldest quarter 0.76711 Solar interception 1.09652 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.15015 Sum of monthly Tavg where Tavg >=5 deg C 1.28982 Precipitation during the hottest quarter 1.31182 Nitrogen content of soil 1.33278 Available water holding capacity of soil 1.35053 Compound topographic index (relative wetness) 1.55041 Bulk density of soil 1.56507 Precipitation during the driest quarter 1.66099 Temperature during the coldest quarter 1.6703 Precipitation during the wettest quarter 2.05825 Temperature during the hottest quarter 2.26504 Elevation 2.27587 Carbon content of soil 2.47461 Day/night diurnal temperature difference 9.0228