Mean annual temperature is between 45 and 57 degrees F, and mean annual precipitation ranges from 28 to 40 inches. Ogle or Tama soils commonly occur on ridgetops upslope from the Hitt soils where the loess is thicker. Durand and Winnebago soils occur in many places with Hitt soils in similar side slope positions, where the drift is thicker. Dodgeville soils occur on steeper slopes or on similar slopes where glacial deposits do not occur above the bedrock. Hitt is the dark colored member of a biosequence containing Oneco and Woodbine series.
Permeability is moderate in the loess and till and slow in the residuum.
Runoff is medium to rapid. Native vegetation was prairie grass. Known extent is small but believed to be moderate. Stephenson County, Illinois, 1969. In minor areas parent material II has been slightly influenced by glacial melt water and thus could be identified as glacial drift.