Marshalltown Muni climate by month
Averages and records for each calendar month at Marshalltown Muni, United States, from 1996 to 2026. The warmest month is July, averaging 28.7°C; the coolest is January at −2.1°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −2.1°C | −11.6°C | 18.3°C26 January 2002 | −33.2°C16 January 2009 | 30 / 30 |
| February | 0.7°C | −9.7°C | 25.6°C26 February 2024 | −30.5°C16 February 2021 | 29 / 30 |
| March | 8.4°C | −2.9°C | 31.1°C21 March 2026 | −26.6°C3 March 2014 | 30 / 30 |
| April | 16.0°C | 3.0°C | 31.1°C15 April 2002 | −11.6°C7 April 2018 | 29 / 30 |
| May | 22.1°C | 9.6°C | 37.8°C27 May 2018 | −5.6°C3 May 2005 | 30 / 30 |
| June | 27.3°C | 15.4°C | 37.8°C27 June 2012 | 5.0°C1 June 2001 | 29 / 30 |
| July | 28.7°C | 17.3°C | 38.9°C25 July 2012 | 6.7°C12 July 2008 | 30 / 30 |
| August | 27.5°C | 15.7°C | 37.8°C23 August 2023 | 5.0°C31 August 2009 | 30 / 30 |
| September | 24.8°C | 11.1°C | 37.8°C9 September 2013 | −2.7°C23 September 2012 | 29 / 30 |
| October | 16.9°C | 4.3°C | 33.9°C3 October 1997 | −11.7°C27 October 1997 | 30 / 30 |
| November | 8.6°C | −2.5°C | 26.7°C13 November 1999 | −21.6°C12 November 2019 | 30 / 30 |
| December | 0.9°C | −8.6°C | 22.8°C15 December 2021 | −30.6°C25 December 2000 | 30 / 30 |
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 29 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.