Gustavus Arpt climate by month
Averages and records for each calendar month at Gustavus Arpt, United States, from 1923 to 2026. The warmest month is July, averaging 17.3°C; the coolest is January at 0.4°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 0.4°C | −5.7°C | 12.2°C6 January 1958 | −31.7°C29 January 1925 | 57 / 70 |
| February | 1.9°C | −5.2°C | 13.9°C26 February 1992 | −26.7°C14 February 1956 | 58 / 67 |
| March | 4.3°C | −3.7°C | 15.6°C22 March 1998 | −25.0°C5 March 1956 | 63 / 69 |
| April | 8.7°C | −0.5°C | 21.1°C27 April 1958 | −15.6°C2 April 1948 | 61 / 70 |
| May | 13.1°C | 3.0°C | 27.2°C27 May 1947 | −8.3°C2 May 1995 | 63 / 70 |
| June | 16.2°C | 6.6°C | 31.1°C20 June 2004 | −3.9°C12 June 1986 | 65 / 72 |
| July | 17.3°C | 8.9°C | 30.6°C7 July 2009 | −1.7°C2 July 1995 | 69 / 73 |
| August | 17.2°C | 8.2°C | 30.6°C8 August 1957 | −3.9°C23 August 1925 | 67 / 73 |
| September | 13.8°C | 5.5°C | 23.9°C6 September 1986 | −5.6°C18 September 1983 | 65 / 74 |
| October | 8.7°C | 2.0°C | 18.3°C3 October 1944 | −16.7°C30 October 1984 | 66 / 71 |
| November | 3.4°C | −2.4°C | 14.4°C14 November 1976 | −26.1°C27 November 1985 | 62 / 69 |
| December | 1.2°C | −4.1°C | 13.3°C10 December 1944 | −29.4°C7 December 1995 | 58 / 69 |
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 57 to 69 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.