Summers are hot and winters are cold. Mean annual temperature is between 45 and 57 degrees F, and mean annual precipitation ranges from 28 to 40 inches. These are the Myrtle , Ogle , Pecatonica , and Westville soils. The Myrtle and Ogle form a biosequence with the Flagg soils. The well drained or moderately well drained Pecatonica and Westville soils have thinner mantles of loess than Flagg soils.
Permeability is moderate.
Surface runoff is medium to rapid. The soils are used mostly for cultivated crops such as corn, small grain, and meadow. Native vegetation was hardwood trees. Known extent is moderate. Stephenson County, Illinois, 1969.