Precipitation during the wettest quarter 0.079323 Precipitation during the hottest quarter 0.130147 Nitrogen content of soil 0.273424 Temperature during the hottest quarter 0.326353 Available water holding capacity of soil 0.349364 Precipitation during the driest quarter 0.362135 Compound topographic index (relative wetness) 0.364262 Precipitation during the coldest quarter 0.434336 Sum of monthly Tavg where Tavg >=5 deg C 0.583717 Ratio of precipitation to potential evapotranspiration 0.597299 Solar interception 0.666462 Carbon content of soil 1.14995 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.28817 Day/night diurnal temperature difference 1.29453 Elevation 1.35461 Temperature during the coldest quarter 1.60551 Bulk density of soil 1.9269