Decatur Arpt climate by month
Averages and records for each calendar month at Decatur Arpt, United States, from 2000 to 2026. The warmest month is July, averaging 30.1°C; the coolest is January at 2.1°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 2.1°C | −6.6°C | 20.0°C7 January 2008 | −26.6°C30 January 2019 | 26 / 26 |
| February | 4.4°C | −5.4°C | 25.0°C27 February 2024 | −23.2°C11 February 2014 | 26 / 26 |
| March | 12.0°C | 0.6°C | 31.1°C26 March 2026 | −22.7°C6 March 2015 | 26 / 26 |
| April | 18.5°C | 6.0°C | 31.1°C30 April 2007 | −11.0°C2 April 2018 | 26 / 26 |
| May | 23.9°C | 11.9°C | 36.1°C28 May 2018 | −1.7°C3 May 2005 | 26 / 26 |
| June | 28.9°C | 17.1°C | 39.4°C29 June 2012 | 2.8°C1 June 2003 | 26 / 26 |
| July | 30.1°C | 18.9°C | 40.0°C5 July 2012 | 7.8°C2 July 2001 | 26 / 26 |
| August | 29.4°C | 17.5°C | 37.8°C12 August 2007 | 7.8°C16 August 2004 | 26 / 26 |
| September | 26.9°C | 13.3°C | 38.3°C2 September 2011 | 1.7°C24 September 2012 | 25 / 26 |
| October | 19.3°C | 7.1°C | 33.9°C7 October 2007 | −4.9°C21 October 2018 | 25 / 25 |
| November | 11.5°C | 1.1°C | 26.7°C1 November 2016 | −14.9°C12 November 2019 | 26 / 26 |
| December | 4.8°C | −3.7°C | 22.2°C3 December 2012 | −25.6°C14 December 2025 | 26 / 26 |
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 25 to 26 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.