All-time weather records — Chicago, IL
Climate change signal in Chicago
of Chicago's all-time daily heat records were set in the last decade (178 of 366 records since 2015).
of all-time daily cold records were set in the last decade (184 of 366 records since 2015).
If records were spread evenly across the station's history, you'd expect roughly 5% per decade. Decade-by-decade, here's where each record-breaking day was set:
| Decade | Heat records set | # | Cold records set | # |
|---|---|---|---|---|
| 2000s | 82 | 78 | ||
| 2010s | 187 | 230 | ||
| 2020s | 97 | 58 |
Records are the all-time daily extremes that are still standing — each daily record can only be held by one year. The station's earliest hot record was set in 2005, the latest in 2026. Period of observation: 2005-2026.
Records by month
| Month | Hottest day | Coldest day | Wettest day |
|---|---|---|---|
| January | 66.0°F — Jan 7, 2008 | -20.9°F — Jan 30, 2019 | — |
| February | 71.1°F — Feb 27, 2024 | -7.1°F — Feb 5, 2007 | — |
| March | 84.9°F — Mar 21, 2012 | 5.0°F — Mar 3, 2014 | — |
| April | 86.0°F — Apr 27, 2021 | 21.0°F — Apr 7, 2007 | — |
| May | 97.0°F — May 27, 2012 | 34.0°F — May 8, 2020 | — |
| June | 100.9°F — Jun 28, 2012 | 46.9°F — Jun 1, 2015 | — |
| July | 105.1°F — Jul 5, 2012 | 54.0°F — Jul 2, 2015 | — |
| August | 99.0°F — Aug 1, 2006 | 57.0°F — Aug 4, 2017 | — |
| September | 97.0°F — Sep 1, 2011 | 43.0°F — Sep 13, 2014 | — |
| October | 89.1°F — Oct 8, 2007 | 28.0°F — Oct 31, 2019 | — |
| November | 75.9°F — Nov 1, 2016 | 12.0°F — Nov 12, 2019 | — |
| December | 71.1°F — Dec 3, 2012 | -8.0°F — Dec 23, 2022 | — |
Click a month to see every daily record for that month in Chicago.