Mean annual air temperature ranges from 45 to 52 degrees F, mean annual precipitation from 25 to 35 inches, frost free days range from 140-180, and the elevation ranges from 680 to 1360 feet. These are the Mundelein and Grays series. The somewhat poorly drained Mundelein soils are on broad nearly level areas adjacent to Barrington soils and form a drainage sequence with them. The moderately well drained Grays soils are on similar landforms adjacent to Barrington soils and have a dark colored surface layer less than 10 inches thick. Moderately well drained.
Surface runoff is slow to medium.
Permeability is moderate. Most areas are cropped. Corn, soybeans, small grain, and hay are the principal crops. Natural vegetation was prairie grass. This series is of moderate extent in MLRAs 103 and 110.