Ketchikan Intl climate by month
Averages and records for each calendar month at Ketchikan Intl, United States, from 1910 to 2026. The warmest month is August, averaging 18.7°C; the coolest is January at 4.0°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 4.0°C | −1.5°C | 16.7°C6 January 1958 | −21.7°C23 January 1916 | 110 / 112 |
| February | 5.2°C | −0.9°C | 17.2°C8 February 1963 | −16.7°C1 February 1917 | 107 / 108 |
| March | 6.8°C | 0.0°C | 20.6°C28 March 1915 | −16.1°C3 March 1955 | 108 / 109 |
| April | 10.0°C | 2.1°C | 23.9°C28 April 1976 | −11.1°C2 April 1920 | 110 / 111 |
| May | 13.9°C | 5.2°C | 33.9°C13 May 1912 | −3.9°C5 May 1913 | 108 / 111 |
| June | 16.8°C | 8.5°C | 35.6°C25 June 1913 | −0.6°C10 June 1911 | 110 / 112 |
| July | 18.4°C | 10.7°C | 33.3°C18 July 1912 | 2.2°C5 July 1914 | 111 / 111 |
| August | 18.7°C | 11.0°C | 31.7°C14 August 1977 | 1.1°C31 August 1913 | 111 / 112 |
| September | 15.7°C | 8.5°C | 26.7°C1 September 1918 | −2.2°C21 September 1926 | 113 / 114 |
| October | 11.1°C | 5.0°C | 22.2°C1 October 1923 | −8.3°C31 October 1984 | 113 / 114 |
| November | 7.1°C | 1.6°C | 18.3°C2 November 1949 | −15.0°C28 November 2006 | 112 / 112 |
| December | 4.6°C | −0.5°C | 16.7°C12 December 1962 | −18.3°C15 December 1964 | 110 / 112 |
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 107 to 113 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.