St Louis/Downtown Arpt weather by month
Averages and records for each calendar month at St Louis/Downtown Arpt, United States, from 1997 to 2026. The warmest month is July, averaging 31.9°C; the coolest is January at 5.0°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 5.0°C | −4.6°C | 22.2°C28 January 2002 | −25.5°C7 January 2014 | 29 / 29 |
| February | 7.8°C | −3.1°C | 30.0°C27 February 2024 | −21.6°C7 February 2014 | 27 / 29 |
| March | 14.2°C | 2.2°C | 33.9°C22 March 2026 | −15.5°C3 March 2014 | 27 / 29 |
| April | 20.3°C | 7.6°C | 33.3°C14 April 2006 | −4.3°C7 April 2007 | 29 / 29 |
| May | 25.3°C | 13.3°C | 35.0°C26 May 2012 | 0.6°C4 May 2011 | 29 / 29 |
| June | 30.3°C | 18.0°C | 41.7°C28 June 2012 | 7.2°C6 June 2000 | 29 / 30 |
| July | 31.9°C | 20.2°C | 41.7°C6 July 2012 | 10.0°C28 July 2013 | 30 / 30 |
| August | 31.1°C | 18.8°C | 40.6°C15 August 2007 | 8.3°C12 August 2004 | 30 / 30 |
| September | 27.8°C | 14.0°C | 38.9°C1 September 2011 | 1.7°C26 September 2000 | 29 / 30 |
| October | 21.1°C | 7.7°C | 34.4°C3 October 2006 | −5.5°C25 October 2013 | 29 / 29 |
| November | 13.7°C | 1.9°C | 29.4°C1 November 2016 | −11.6°C12 November 2019 | 29 / 29 |
| December | 7.4°C | −2.3°C | 25.6°C28 December 2025 | −20.6°C20 December 2000 | 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 27 to 30 years each.
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Climate at nearby stations
The closest stations with twelve months of archive of their own, nearest first.
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.