Historic Data
- Detailed almanac search form
- O’Hare daily summary
- O’Hare monthly summary
- O’Hare seasonal summary
- O’Hare annual summary
- Regional temp and precipitation
- Illinois temp and precipitation
- Data and records for Chicago and Rockford
Normals & Records
- Chicago daily normals
- Chicago official records
- Chicago records by date
- Record reports from O’Hare
- Chicago hourly weather history
