Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.22246 Compound topographic index (relative wetness) 1.23537 Precipitation during the wettest quarter 1.62769 Precipitation during the driest quarter 1.63524 Nitrogen content of soil 1.71992 Temperature during the hottest quarter 1.79605 Carbon content of soil 1.91446 Elevation 2.23257 Available water holding capacity of soil 2.28675 Bulk density of soil 2.50578 Sum of monthly Tavg where Tavg >=5 deg C 2.92927 Day/night diurnal temperature difference 3.46702 Solar interception 3.49437 Precipitation during the coldest quarter 4.24113 Ratio of precipitation to potential evapotranspiration 4.94703 Temperature during the coldest quarter 6.33596 Precipitation during the hottest quarter 6.61207