Des Moines Intl climate by month
Averages and records for each calendar month at Des Moines Intl, United States, from 1945 to 2026. The warmest month is July, averaging 30.1°C; the coolest is January at −1.3°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −1.3°C | −10.8°C | 19.4°C8 January 2003 | −31.1°C21 January 1970 | 81 / 81 |
| February | 1.6°C | −8.3°C | 25.6°C26 February 2024 | −32.2°C3 February 1996 | 81 / 81 |
| March | 8.6°C | −2.0°C | 32.8°C29 March 1986 | −30.0°C1 March 1962 | 81 / 81 |
| April | 16.6°C | 4.7°C | 33.9°C22 April 1980 | −12.8°C3 April 1975 | 81 / 81 |
| May | 22.5°C | 11.0°C | 37.2°C27 May 2018 | −2.2°C6 May 1947 | 81 / 81 |
| June | 27.9°C | 16.6°C | 39.4°C21 June 1988 | 5.0°C3 June 1998 | 81 / 81 |
| July | 30.1°C | 19.1°C | 41.1°C25 July 2012 | 8.3°C30 July 1971 | 82 / 82 |
| August | 29.0°C | 17.9°C | 42.2°C16 August 1983 | 4.4°C20 August 1950 | 82 / 82 |
| September | 24.8°C | 12.8°C | 38.3°C9 September 2013 | −2.2°C29 September 1984 | 81 / 82 |
| October | 18.0°C | 6.3°C | 35.0°C5 October 1963 | −10.0°C19 October 1972 | 81 / 81 |
| November | 9.0°C | −1.1°C | 27.2°C13 November 1999 | −20.0°C8 November 1991 | 81 / 81 |
| December | 1.5°C | −7.6°C | 23.3°C15 December 2021 | −30.0°C23 December 1989 | 81 / 81 |
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 81 to 82 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.