Mean annual temperature varies from 39 to 57 degrees F, and mean annual precipitation varies from 25 to 45 inches. These are the Dubuque , Fayette , La Farge , Palsgrove , and Sylvan soils and the Port Byron , Hickory , Mt. Carroll, and Timula soils. The Port Byron, Fayette, Mt. Carroll , Sylvan, and Timula soils are on similar landforms. The Dubuque, Hickory, La Farge, and Palsgrove soils are on lower landscape positions or are down slope from Seaton soils. Runoff is slow or medium on nearly level to sloping areas, and medium or rapid on strongly sloping to very steep areas.
Permeability is moderate.
The nearly level to strongly sloping areas are mostly cleared and used for row crops or pasture. Steeper slopes are mostly wooded or used for pasture. Native vegetation was deciduous forests, mainly of oak, hickory, and birch. The series is of large extent. Henderson County, Illinois, 1947.