St Charles/Smartt Arpt weather by month
Averages and records for each calendar month at St Charles/Smartt Arpt, United States, from 1997 to 2026. The warmest month is July, averaging 31.5°C; the coolest is January at 4.2°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 4.2°C | −5.8°C | 23.3°C7 January 2008 | −25.0°C5 January 1999 | 28 / 29 |
| February | 7.1°C | −3.8°C | 30.0°C27 February 2024 | −24.3°C7 February 2014 | 27 / 29 |
| March | 13.9°C | 1.7°C | 35.0°C26 March 2026 | −16.6°C3 March 2014 | 29 / 29 |
| April | 20.2°C | 7.4°C | 34.4°C14 April 2006 | −4.9°C7 April 2007 | 29 / 29 |
| May | 25.1°C | 13.4°C | 35.0°C26 May 2012 | 0.6°C1 May 2005 | 28 / 29 |
| June | 29.9°C | 18.3°C | 40.6°C28 June 2012 | 8.9°C1 June 2003 | 28 / 29 |
| July | 31.5°C | 20.1°C | 41.1°C7 July 2012 | 10.6°C28 July 2013 | 28 / 29 |
| August | 30.7°C | 18.8°C | 39.4°C12 August 2007 | 8.9°C13 August 2004 | 27 / 28 |
| September | 27.5°C | 14.0°C | 38.9°C1 September 2011 | 0.6°C29 September 2003 | 28 / 29 |
| October | 20.8°C | 7.7°C | 34.4°C3 October 2006 | −4.9°C29 October 2017 | 28 / 28 |
| November | 13.4°C | 1.7°C | 28.9°C1 November 2016 | −11.1°C21 November 2000 | 28 / 28 |
| December | 6.7°C | −3.0°C | 25.0°C28 December 2025 | −21.0°C23 December 2022 | 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 27 to 29 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.