Chicago Exec climate by month
Averages and records for each calendar month at Chicago Exec, United States, from 1996 to 2026. The warmest month is July, averaging 28.8°C; the coolest is January at −0.1°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −0.1°C | −7.8°C | 18.3°C7 January 2008 | −29.3°C30 January 2019 | 30 / 30 |
| February | 2.3°C | −6.5°C | 23.9°C27 February 2024 | −24.3°C28 February 2015 | 30 / 30 |
| March | 8.6°C | −1.1°C | 30.0°C20 March 2012 | −19.9°C3 March 2014 | 30 / 30 |
| April | 14.8°C | 3.9°C | 31.1°C15 April 2002 | −6.7°C9 April 1997 | 30 / 30 |
| May | 20.9°C | 9.5°C | 36.1°C27 May 2018 | −1.7°C3 May 2004 | 30 / 30 |
| June | 26.6°C | 15.4°C | 37.2°C28 June 2012 | 2.8°C1 June 2003 | 29 / 30 |
| July | 28.8°C | 18.4°C | 40.0°C6 July 2012 | 10.0°C10 July 1996 | 31 / 31 |
| August | 27.8°C | 17.7°C | 37.8°C24 August 2023 | 8.3°C31 August 2009 | 31 / 31 |
| September | 24.4°C | 13.5°C | 35.6°C10 September 2013 | 1.1°C24 September 2012 | 29 / 31 |
| October | 17.2°C | 6.8°C | 31.7°C5 October 1997 | −3.8°C31 October 2023 | 29 / 30 |
| November | 9.5°C | 0.5°C | 24.4°C1 November 2016 | −12.7°C12 November 2019 | 30 / 30 |
| December | 2.9°C | −4.8°C | 20.6°C5 December 2001 | −22.2°C22 December 2000 | 30 / 30 |
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 31 years each.
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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.