Iowa City Muni climate by month
Averages and records for each calendar month at Iowa City Muni, United States, from 1948 to 2026. The warmest month is July, averaging 29.6°C; the coolest is January at −0.8°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −0.8°C | −10.4°C | 18.3°C8 January 2003 | −33.3°C31 January 1996 | 37 / 37 |
| February | 1.9°C | −8.5°C | 25.0°C22 February 2017 | −36.7°C3 February 1996 | 37 / 37 |
| March | 9.1°C | −2.2°C | 32.8°C21 March 2026 | −26.7°C12 March 1948 | 37 / 37 |
| April | 16.6°C | 3.8°C | 33.3°C29 April 1952 | −9.3°C2 April 2018 | 37 / 37 |
| May | 22.8°C | 10.4°C | 36.7°C27 May 2018 | −4.4°C3 May 2005 | 36 / 37 |
| June | 28.0°C | 16.2°C | 37.2°C27 June 2012 | 5.0°C4 June 1950 | 35 / 36 |
| July | 29.6°C | 18.2°C | 40.6°C7 July 2012 | 7.8°C5 July 1997 | 36 / 36 |
| August | 28.6°C | 16.8°C | 38.3°C20 August 2003 | 4.4°C20 August 1950 | 37 / 37 |
| September | 25.3°C | 11.7°C | 38.3°C9 September 2013 | −3.3°C23 September 1995 | 35 / 37 |
| October | 18.0°C | 5.0°C | 33.9°C3 October 2006 | −11.7°C29 October 1952 | 36 / 36 |
| November | 9.5°C | −1.6°C | 26.1°C1 November 2000 | −19.4°C24 November 1950 | 36 / 36 |
| December | 2.0°C | −7.4°C | 23.9°C15 December 2021 | −28.3°C15 December 1951 | 36 / 36 |
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 35 to 37 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.