For over a hundred years the Illinois State Water Survey, part of the Illinois Department of Natural Resources, "has documented quality data on a wide multitude of water and atmospheric variables". Within the main Web site is the Soil Temperatures page, which provides daily publication of maps based on data from various sites across the state. These include a 10am 4 inch bare soil temperature, daily maximum and minimum 4 inch bare soil temperature, 10am 4 inch soil temperature under sod, daily maximum and minimum 4 inch soil temperature under sod, and a daily maximum and minimum 8 inch soil temperature under sod map. The simple graphics display the particular variable along with what each of the nineteen stations recorded. Although location specific, the site gives those interested a helpful resource for easily retrieving the unique data provided.