Juneau Intl climate by month
Averages and records for each calendar month at Juneau Intl, United States, from 1936 to 2026. The warmest month is July, averaging 17.8°C; the coolest is January at −0.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −0.5°C | −6.1°C | 15.6°C20 January 1942 | −30.0°C12 January 1972 | 81 / 82 |
| February | 1.4°C | −4.8°C | 13.9°C27 February 1992 | −30.0°C2 February 1968 | 81 / 81 |
| March | 3.8°C | −3.1°C | 16.1°C21 March 1998 | −26.1°C7 March 1972 | 81 / 81 |
| April | 8.8°C | 0.3°C | 23.3°C26 April 2003 | −14.4°C5 April 1963 | 80 / 81 |
| May | 13.3°C | 4.3°C | 26.7°C27 May 2010 | −3.9°C2 May 1956 | 80 / 80 |
| June | 16.7°C | 7.7°C | 30.0°C13 June 1969 | −0.6°C7 June 1955 | 80 / 80 |
| July | 17.8°C | 9.4°C | 32.2°C7 July 1975 | 2.2°C8 July 1950 | 81 / 81 |
| August | 17.2°C | 9.0°C | 29.4°C14 August 2026 | −2.8°C31 August 1941 | 81 / 81 |
| September | 13.4°C | 6.4°C | 25.6°C18 September 1941 | −5.0°C24 September 1972 | 81 / 83 |
| October | 8.4°C | 2.9°C | 17.2°C1 October 2018 | −11.7°C30 October 1984 | 80 / 80 |
| November | 3.2°C | −1.9°C | 13.3°C2 November 1949 | −20.6°C21 November 1966 | 81 / 81 |
| December | 0.5°C | −4.6°C | 12.2°C23 December 1999 | −29.4°C31 December 1949 | 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 80 to 81 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.