Mean annual temperature is 54 to 57 degrees F., mean annual precipitation is 36 to 40 inches, frost-free period is 170 to 200 days, and elevation is 400 to 800 feet above sea level. These are the Bethalto , Downsouth , Edwardsville , and Wakenda soils. The somewhat poorly drained Bethalto and Edwardsville soils are on slightly higher or more sloping landform positions nearby. The moderately well drained Downsouth soils and the well drained Wakenda soils are on summits, shoulders, and backslopes above the Mascoutah soils. In addition, the Bethalto and Downsouth soils do not have a mollic epipedon and typically are nearer the drainageways.
Permeability is moderate.
Surface runoff is very slow or ponded. In drained areas, depth to an intermittent apparent high water table is 0.5 foot above the surface to 1.0 foot below from December to May in most years. Most areas are cropped to corn, soybeans, and small grain. Native vegetation is marsh grasses and sedges. Extent is small, and mainly in MLRA 115.