Port Heiden Arpt climate by month
Averages and records for each calendar month at Port Heiden Arpt, United States, from 1942 to 2026. The warmest month is August, averaging 14.6°C; the coolest is February at −1.9°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −1.7°C | −8.6°C | 13.9°C16 January 1943 | −31.7°C8 January 1965 | 32 / 36 |
| February | −1.9°C | −8.8°C | 12.8°C28 February 1960 | −30.0°C19 February 1974 | 32 / 35 |
| March | 0.2°C | −6.9°C | 12.2°C5 March 1943 | −32.2°C7 March 1971 | 35 / 38 |
| April | 3.3°C | −3.3°C | 16.7°C14 April 1965 | −21.1°C1 April 1952 | 36 / 38 |
| May | 8.1°C | 1.4°C | 23.9°C27 May 1959 | −11.7°C15 May 1971 | 34 / 37 |
| June | 11.6°C | 5.1°C | 27.2°C14 June 1969 | −3.9°C19 June 1975 | 34 / 37 |
| July | 14.2°C | 7.9°C | 30.6°C11 July 1971 | 0.0°C29 July 1948 | 34 / 38 |
| August | 14.6°C | 8.7°C | 27.8°C3 August 1943 | −0.6°C11 August 1948 | 33 / 37 |
| September | 12.0°C | 5.9°C | 22.8°C1 September 1942 | −4.4°C19 September 1972 | 34 / 38 |
| October | 6.3°C | 0.2°C | 17.8°C5 October 1970 | −18.3°C21 October 1966 | 36 / 39 |
| November | 2.2°C | −3.9°C | 12.8°C15 November 1959 | −25.0°C28 November 1971 | 30 / 36 |
| December | −1.9°C | −8.4°C | 15.0°C13 December 1975 | −30.0°C28 December 1961 | 28 / 35 |
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 28 to 36 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.