Guernsey Arpt climate by month
Averages and records for each calendar month at Guernsey Arpt, Guernsey, from 1959 to 2026. The warmest month is August, averaging 19.5°C; the coolest is February at 8.6°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 8.7°C | 4.8°C | 13.3°C9 January 2007 | −7.8°C20 January 1963 | 67 / 67 |
| February | 8.6°C | 4.5°C | 16.1°C26 February 2019 | −7.2°C7 February 1991 | 65 / 67 |
| March | 10.0°C | 5.4°C | 20.1°C31 March 2021 | −3.0°C1 March 2018 | 67 / 67 |
| April | 11.9°C | 6.6°C | 24.5°C10 April 2020 | −1.4°C11 April 1986 | 67 / 67 |
| May | 14.9°C | 9.1°C | 30.8°C24 May 2026 | 0.1°C2 May 1979 | 66 / 67 |
| June | 17.6°C | 11.6°C | 33.8°C22 June 2026 | 5.4°C1 June 1975 | 67 / 67 |
| July | 19.4°C | 13.5°C | 32.6°C18 July 2016 | 8.4°C17 July 1980 | 67 / 67 |
| August | 19.5°C | 14.0°C | 29.5°C3 August 1975 | 9.2°C28 August 1986 | 67 / 67 |
| September | 17.8°C | 13.0°C | 30.6°C1 September 1961 | 5.8°C28 September 1974 | 66 / 66 |
| October | 15.1°C | 11.0°C | 24.3°C7 October 2023 | 3.5°C28 October 2003 | 66 / 66 |
| November | 11.7°C | 8.0°C | 17.8°C23 November 2024 | −0.8°C29 November 2010 | 66 / 66 |
| December | 9.8°C | 5.8°C | 14.6°C1 December 1985 | −3.8°C25 December 1963 | 66 / 67 |
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 65 to 67 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.