Over the last 365 complete days, the highest daily maximum at Chicago O'Hare was 36°C on Jul 14 2026 and the lowest was -16°C on Jan 23 2026. The observed high is the highest temperature in the airport's own METAR reports during the local calendar day. Updated twice a day.
The first check appears after the first archived day ends.
Scorecard appears after 7 checked days (0/7 so far).
| Month | Average high | Warmest day | Coolest day | Days |
|---|---|---|---|---|
| Oct 2026 | 21.4° | 31° | 13° | 29 |
| Sep 2026 | 24.9° | 35° | 17° | 30 |
| Aug 2026 | 27.3° | 31° | 22° | 31 |
| Jul 2026 | 29.4° | 36° | 23° | 31 |
| Jun 2026 | 25.9° | 34° | 19° | 30 |
| May 2026 | 21.0° | 30° | 9° | 31 |
| Apr 2026 | 17.5° | 28° | 3° | 30 |
| Mar 2026 | 12.5° | 27° | -4° | 31 |
| Feb 2026 | 5.1° | 18° | -4° | 28 |
| Jan 2026 | -1.8° | 16° | -16° | 31 |
| Dec 2025 | 1.2° | 13° | -13° | 31 |
| Nov 2025 | 9.4° | 21° | -1° | 30 |
| Oct 2025 | 12.5° | 14° | 11° | 2 |