Chicago/Midway Intl climate by month
Averages and records for each calendar month at Chicago/Midway Intl, United States, from 1997 to 2026. The warmest month is July, averaging 29.4°C; the coolest is January at 0.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 0.5°C | −6.7°C | 18.3°C7 January 2008 | −29.9°C30 January 2019 | 29 / 29 |
| February | 2.9°C | −5.2°C | 23.3°C27 February 2024 | −22.7°C5 February 2007 | 29 / 29 |
| March | 9.3°C | 0.3°C | 30.0°C21 March 2012 | −20.0°C4 March 2002 | 29 / 29 |
| April | 15.8°C | 5.5°C | 31.7°C15 April 2002 | −6.0°C7 April 2018 | 29 / 29 |
| May | 21.8°C | 11.3°C | 36.1°C27 May 2012 | −0.5°C9 May 2020 | 30 / 30 |
| June | 27.3°C | 17.1°C | 38.3°C28 June 2012 | 3.9°C1 June 2003 | 30 / 30 |
| July | 29.4°C | 20.1°C | 40.0°C30 July 1999 | 12.2°C10 July 1997 | 30 / 30 |
| August | 28.2°C | 19.3°C | 37.8°C24 August 2023 | 9.4°C31 August 2009 | 30 / 30 |
| September | 25.0°C | 15.4°C | 35.6°C10 September 2013 | 5.6°C29 September 2003 | 29 / 30 |
| October | 17.7°C | 8.5°C | 32.2°C3 October 2025 | −3.2°C31 October 2019 | 29 / 29 |
| November | 10.1°C | 2.0°C | 25.0°C1 November 2016 | −12.7°C12 November 2019 | 29 / 29 |
| December | 3.3°C | −3.7°C | 22.2°C3 December 2012 | −22.7°C23 December 2022 | 29 / 29 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 29 to 30 years each.
See what Chicago/Midway Intl is doing right now
Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.