Dubuque Rgnl climate by month
Averages and records for each calendar month at Dubuque Rgnl, United States, from 1951 to 2026. The warmest month is July, averaging 27.8°C; the coolest is January at −3.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −3.5°C | −12.2°C | 15.6°C31 January 1989 | −34.9°C31 January 2019 | 74 / 75 |
| February | −0.7°C | −9.8°C | 22.2°C26 February 2024 | −32.8°C5 February 1979 | 75 / 75 |
| March | 6.2°C | −3.6°C | 29.4°C29 March 1986 | −28.9°C1 March 1962 | 75 / 76 |
| April | 14.4°C | 3.0°C | 33.9°C22 April 1980 | −11.7°C11 April 1973 | 75 / 76 |
| May | 20.7°C | 9.1°C | 35.0°C27 May 2018 | −6.1°C3 May 2005 | 75 / 75 |
| June | 25.9°C | 14.5°C | 37.8°C20 June 1988 | 2.2°C11 June 1972 | 75 / 76 |
| July | 27.8°C | 16.8°C | 38.3°C31 July 1988 | 6.7°C30 July 1971 | 75 / 75 |
| August | 26.7°C | 15.6°C | 37.8°C1 August 1988 | 4.4°C28 August 1986 | 75 / 76 |
| September | 22.6°C | 10.9°C | 36.1°C9 September 1955 | −2.2°C20 September 1956 | 74 / 76 |
| October | 16.0°C | 4.7°C | 32.2°C3 October 1997 | −10.6°C29 October 1952 | 74 / 74 |
| November | 7.1°C | −2.3°C | 23.9°C8 November 1999 | −27.2°C26 November 1977 | 74 / 75 |
| December | −0.5°C | −8.8°C | 20.6°C15 December 2021 | −31.7°C24 December 1983 | 74 / 74 |
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 74 to 75 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.