Dutch Harbor/Unalaska Arpt weather by month
Averages and records for each calendar month at Dutch Harbor/Unalaska Arpt, United States, from 1915 to 2026. The warmest month is August, averaging 15.0°C; the coolest is January at 2.7°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 2.7°C | −2.0°C | 14.4°C11 January 1952 | −22.2°C22 January 1986 | 70 / 74 |
| February | 3.0°C | −1.9°C | 15.6°C5 February 1932 | −17.8°C5 February 1991 | 70 / 73 |
| March | 3.6°C | −1.8°C | 20.6°C25 March 1936 | −16.7°C14 March 1983 | 71 / 72 |
| April | 5.1°C | −0.1°C | 16.1°C30 April 1920 | −12.2°C13 April 1983 | 70 / 75 |
| May | 7.8°C | 2.4°C | 18.9°C27 May 1927 | −9.4°C2 May 1984 | 73 / 76 |
| June | 10.9°C | 5.4°C | 22.8°C21 June 1915 | −1.1°C6 June 1916 | 74 / 76 |
| July | 14.0°C | 7.8°C | 26.1°C9 July 1917 | 1.1°C12 July 1989 | 73 / 76 |
| August | 15.0°C | 8.6°C | 27.8°C28 August 1982 | −3.9°C4 August 1986 | 71 / 75 |
| September | 12.2°C | 6.5°C | 26.7°C10 September 1939 | −5.0°C5 September 1993 | 71 / 74 |
| October | 8.6°C | 3.2°C | 18.3°C1 October 1916 | −15.0°C29 October 1985 | 73 / 75 |
| November | 5.6°C | 0.4°C | 19.4°C21 November 1926 | −13.3°C19 November 1991 | 68 / 72 |
| December | 3.8°C | −1.1°C | 15.0°C8 December 1994 | −15.0°C21 December 1983 | 68 / 73 |
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 68 to 74 years each.
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Climate at nearby stations
The closest stations with twelve months of archive of their own, nearest first.
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.