Mean annual temperature ranges from 50 to 57 degrees F, and mean annual precipitation ranges from 30 to 48 inches. These are the Alvin , Ayrshire , Lamont , and Princeton soils. The well drained Alvin, Lamont, and Princeton soils have continuous argillic horizons that are on similar landform positions. The somewhat poorly drained Ayrshire soils are on interdunal areas. Runoff is slow on gentle slopes and medium on steeper slopes.
Permeability is rapid or moderately rapid.
Most areas are used for pasture or woodland. Some areas are used for corn, soybeans, small grain, forage crops, and specialty crops such as cantaloupe, watermelon and peaches. Native vegetation is deciduous hardwoods, mainly oak and hickory. Extent is moderate and mainly in MLRA's 114 and 115. Lawrence County, Illinois, 1952.