Precipitation during the wettest quarter 0 Nitrogen content of soil 0.258998 Precipitation during the driest quarter 0.25985 Carbon content of soil 0.29647 Solar interception 0.512707 Precipitation during the hottest quarter 0.892544 Precipitation during the coldest quarter 1.05823 Day/night diurnal temperature difference 1.51838 Compound topographic index (relative wetness) 1.52817 Bulk density of soil 1.80965 Temperature during the coldest quarter 2.12181 Ratio of precipitation to potential evapotranspiration 2.37193 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 2.80925 Temperature during the hottest quarter 2.99587 Available water holding capacity of soil 3.80827 Sum of monthly Tavg where Tavg >=5 deg C 4.29018