Iliamna Arpt climate by month
Averages and records for each calendar month at Iliamna Arpt, United States, from 1920 to 2026. The warmest month is July, averaging 17.0°C; the coolest is January at −4.9°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −4.9°C | −11.9°C | 13.9°C27 January 2014 | −43.9°C22 January 1947 | 82 / 84 |
| February | −3.2°C | −11.1°C | 10.0°C18 February 2025 | −43.3°C2 February 1947 | 83 / 85 |
| March | −1.3°C | −9.9°C | 11.1°C6 March 1921 | −34.4°C17 March 1922 | 82 / 83 |
| April | 4.3°C | −3.7°C | 19.4°C28 April 2005 | −34.4°C1 April 1920 | 81 / 84 |
| May | 10.5°C | 1.9°C | 26.7°C26 May 2006 | −15.6°C4 May 1949 | 83 / 85 |
| June | 15.2°C | 6.3°C | 32.8°C27 June 1953 | −2.2°C12 June 1922 | 80 / 82 |
| July | 17.0°C | 9.1°C | 30.0°C4 July 2019 | −1.1°C2 July 1921 | 81 / 84 |
| August | 16.2°C | 9.0°C | 28.3°C6 August 1968 | −5.6°C30 August 1922 | 82 / 86 |
| September | 12.3°C | 5.3°C | 23.9°C12 September 2018 | −6.7°C27 September 1921 | 81 / 86 |
| October | 5.3°C | −1.2°C | 18.9°C4 October 1976 | −20.0°C30 October 1985 | 82 / 86 |
| November | −0.9°C | −7.3°C | 11.1°C2 November 1986 | −28.9°C30 November 1948 | 81 / 87 |
| December | −4.4°C | −11.4°C | 9.4°C7 December 2014 | −35.0°C15 December 1946 | 80 / 83 |
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 83 years each.
See what Iliamna Arpt is doing right now
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.