NR = Not Reported. The official station did not report records for that time. The Weather Warehouse provides a complete Weather history for over 10,000 official National Weather Service (NWS/NOAA) government weather stations (one of the best offerings on the web). Past weather data is available for some stations as far back as 1902.
Six Flags Great America. Gurnee, Illinois. Located between Chicago and Milwaukee on Interstate 94, Six Flags Great America features eight themed areas, each highlighting a different aspect of Americana. The theme park opened in 1976 and was owned and operated by Marriott before being sold to Six Flags in 1984.
The U.S.A.'s Six Flags locations can be found in Arlington, Texas; Austell, Georgia; Eureka, Missouri; Jackson, New Jersey; Valencia, California; Gurnee, Illinois; San Antonio, Texas; Largo, Maryland; Queensbury, New York; and Marietta, Georgia.