Mean annual temperature ranges from 45 to 48 degrees F, and mean annual precipitation ranges from 28 to 35 inches. These are mainly the Mendota and Plano soils and, in some places, the LeRoy soils. They are in areas next to the Markesan series where the loess or silt mantle is thicker over the till. Both Mendota and Plano have thicker sola and are fine-silty. In nearby areas where the surface layer is lighter colored, the LeRoy soils are associates.
Surface runoff is medium.
Permeability is moderate. Areas with considerable cobbles and stones on the surface and steeper sloping areas usually are used for livestock pasture. Native vegetation was mainly prairie grasses, forbs, and scattered bur oaks. Southeastern Wisconsin, on the shallow ground moraine of the limestone drift region. This soil is of small extent.