Precipitation during the driest quarter 1.04042 Precipitation during the coldest quarter 1.07711 Precipitation during the hottest quarter 1.14203 Compound topographic index (relative wetness) 1.28351 Nitrogen content of soil 1.28398 Sum of monthly Tavg where Tavg >=5 deg C 1.33482 Solar interception 1.43972 Precipitation during the wettest quarter 1.50648 Ratio of precipitation to potential evapotranspiration 1.72777 Available water holding capacity of soil 1.84255 Temperature during the hottest quarter 2.06093 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 2.95875 Temperature during the coldest quarter 3.19481 Elevation 3.4325 Carbon content of soil 4.60112 Bulk density of soil 5.48489 Day/night diurnal temperature difference 7.0744