Jersey Arpt climate by month
Averages and records for each calendar month at Jersey Arpt, Jersey, from 1959 to 2026. The warmest month is August, averaging 20.4°C; the coolest is January at 8.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 8.5°C | 4.1°C | 14.3°C25 January 1983 | −10.9°C20 January 1963 | 67 / 67 |
| February | 8.7°C | 3.9°C | 16.7°C28 February 1977 | −8.7°C7 February 1991 | 65 / 67 |
| March | 10.5°C | 5.1°C | 22.0°C31 March 2021 | −4.7°C7 March 1971 | 67 / 67 |
| April | 12.7°C | 6.6°C | 25.8°C29 April 2025 | −1.6°C12 April 1986 | 67 / 67 |
| May | 15.9°C | 9.2°C | 34.1°C25 May 2026 | 0.0°C2 May 1979 | 67 / 67 |
| June | 18.5°C | 11.8°C | 34.9°C22 June 2026 | 5.5°C4 June 1984 | 67 / 67 |
| July | 20.3°C | 13.8°C | 36.0°C22 July 2019 | 8.5°C4 July 1968 | 67 / 67 |
| August | 20.4°C | 14.2°C | 34.8°C4 August 2003 | 7.7°C30 August 2011 | 67 / 67 |
| September | 18.6°C | 12.9°C | 30.9°C6 September 2021 | 5.6°C28 September 1974 | 66 / 66 |
| October | 15.3°C | 10.6°C | 25.6°C2 October 2011 | 0.4°C29 October 1997 | 66 / 66 |
| November | 11.7°C | 7.4°C | 17.2°C2 November 2011 | −3.1°C30 November 2016 | 64 / 66 |
| December | 9.5°C | 5.0°C | 15.1°C21 December 1977 | −8.4°C27 December 1970 | 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 64 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.