Dupage Cnty Arpt climate by month
Averages and records for each calendar month at Dupage Cnty Arpt, United States, from 1997 to 2026. The warmest month is July, averaging 28.9°C; the coolest is January at −0.7°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −0.7°C | −9.0°C | 18.3°C7 January 2008 | −33.8°C31 January 2019 | 29 / 29 |
| February | 2.0°C | −7.7°C | 23.3°C27 February 2024 | −28.8°C10 February 2011 | 29 / 29 |
| March | 9.0°C | −2.0°C | 28.3°C20 March 2012 | −22.8°C4 March 2002 | 29 / 29 |
| April | 15.7°C | 3.3°C | 31.1°C18 April 2002 | −8.8°C7 April 2018 | 29 / 29 |
| May | 21.8°C | 9.2°C | 35.6°C27 May 2012 | −3.3°C21 May 2002 | 29 / 29 |
| June | 27.0°C | 14.7°C | 37.2°C28 June 2012 | 1.1°C1 June 2003 | 30 / 30 |
| July | 28.9°C | 17.2°C | 37.8°C24 July 2005 | 5.6°C2 July 2001 | 30 / 30 |
| August | 27.9°C | 16.2°C | 36.1°C2 August 2006 | 6.1°C31 August 2009 | 29 / 30 |
| September | 24.8°C | 12.0°C | 35.0°C2 September 2008 | 0.0°C24 September 2012 | 29 / 30 |
| October | 17.3°C | 5.6°C | 31.7°C3 October 2025 | −6.1°C28 October 1997 | 29 / 29 |
| November | 9.3°C | −0.6°C | 24.4°C1 November 2016 | −15.5°C22 November 2015 | 28 / 29 |
| December | 2.3°C | −6.1°C | 20.6°C3 December 2012 | −26.0°C19 December 2016 | 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 28 to 30 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.