Mattoon/Coles Cnty climate by month
Averages and records for each calendar month at Mattoon/Coles Cnty, United States, from 1998 to 2026. The warmest month is July, averaging 29.6°C; the coolest is January at 2.2°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 2.2°C | −6.2°C | 18.9°C7 January 2008 | −25.5°C6 January 2014 | 29 / 29 |
| February | 4.9°C | −4.5°C | 23.3°C24 February 2000 | −24.9°C7 February 2014 | 29 / 29 |
| March | 11.7°C | 1.0°C | 30.0°C22 March 2026 | −21.0°C6 March 2015 | 29 / 29 |
| April | 18.1°C | 6.6°C | 30.6°C30 April 2007 | −5.5°C7 April 2007 | 29 / 29 |
| May | 23.5°C | 12.4°C | 34.4°C28 May 2018 | −0.6°C3 May 2005 | 29 / 29 |
| June | 28.3°C | 17.3°C | 40.0°C29 June 2012 | 1.7°C11 June 2007 | 29 / 29 |
| July | 29.6°C | 18.9°C | 41.1°C7 July 2012 | 7.8°C2 July 2001 | 29 / 29 |
| August | 29.1°C | 17.7°C | 37.2°C2 August 2012 | 8.3°C12 August 2004 | 28 / 29 |
| September | 26.6°C | 13.7°C | 37.2°C1 September 2011 | 1.1°C25 September 2001 | 28 / 29 |
| October | 19.3°C | 7.6°C | 33.3°C1 October 2019 | −4.3°C29 October 2010 | 28 / 28 |
| November | 11.6°C | 1.7°C | 26.1°C1 November 2016 | −16.0°C12 November 2019 | 28 / 28 |
| December | 4.8°C | −3.2°C | 21.7°C4 December 1998 | −22.8°C14 December 2025 | 28 / 28 |
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 29 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.