Duluth Intl Arpt climate by month
Averages and records for each calendar month at Duluth Intl Arpt, United States, from 1948 to 2026. The warmest month is July, averaging 24.9°C; the coolest is January at −8.0°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −8.0°C | −17.7°C | 8.9°C8 January 2003 | −39.4°C15 January 1972 | 79 / 79 |
| February | −5.1°C | −15.5°C | 12.8°C24 February 1976 | −39.4°C2 February 1996 | 79 / 79 |
| March | 0.9°C | −8.9°C | 23.9°C17 March 2012 | −33.9°C2 March 1989 | 79 / 79 |
| April | 8.9°C | −1.4°C | 31.1°C27 April 1952 | −20.6°C3 April 1954 | 79 / 79 |
| May | 16.6°C | 4.5°C | 33.3°C6 May 2016 | −8.3°C3 May 1967 | 79 / 79 |
| June | 21.7°C | 9.6°C | 34.4°C18 June 1995 | −2.8°C10 June 1972 | 79 / 79 |
| July | 24.9°C | 13.0°C | 36.1°C7 July 1988 | 1.7°C1 July 1988 | 79 / 79 |
| August | 23.5°C | 12.3°C | 35.0°C7 August 1949 | 0.0°C27 August 1986 | 79 / 79 |
| September | 18.5°C | 7.8°C | 36.1°C3 September 2023 | −5.0°C20 September 1962 | 78 / 79 |
| October | 11.5°C | 2.0°C | 30.0°C2 October 1953 | −13.3°C27 October 1976 | 78 / 78 |
| November | 2.1°C | −5.6°C | 23.9°C6 November 2020 | −30.6°C30 November 1964 | 78 / 78 |
| December | −5.2°C | −13.7°C | 12.8°C3 December 1962 | −36.7°C20 December 1983 | 78 / 78 |
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 78 to 79 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.