Editing Jersey (section)

=== Climate ===
The island has an [[oceanic climate]], with cool to mild winters and lukewarm to warm summers.<ref name="Factbook">{{Cite web |date=5 October 2006 |title=CIA – The World Factbook – Jersey |url=https://www.cia.gov/the-world-factbook/countries/jersey/ |access-date=7 October 2006 |publisher=[[Central Intelligence Agency]] |archive-date=13 January 2021 |archive-url=https://web.archive.org/web/20210113013826/https://www.cia.gov/the-world-factbook/countries/jersey |url-status=live }}</ref> The highest temperature recorded was 37.9&nbsp;°C (100.2&nbsp;°F), on [[2022 United Kingdom heatwaves#July heatwave|18 July 2022]],<ref>{{Cite web |date=18 July 2022 |title=Jersey records hottest ever day as temperatures top 36°C |url=https://jerseyeveningpost.com/news/2022/07/18/jersey-records-hottest-ever-day-as-temperatures-top-36c/ |access-date=18 July 2022 |website=Jersey Evening Post |language=en-GB |archive-date=18 July 2022 |archive-url=https://web.archive.org/web/20220718175610/https://jerseyeveningpost.com/news/2022/07/18/jersey-records-hottest-ever-day-as-temperatures-top-36c/ |url-status=live }}</ref> and the lowest temperature recorded was {{convert|&minus;10.3|°C|°F|1|disp=or}}, on 5 January 1894. 2022 was the warmest (and sunniest) year on record; the mean daily air temperature was {{convert|13.56|°C|°F|2|disp=or}}.<ref>{{cite web |title=Jersey's hottest year on record |url=https://www.gov.je/News/2023/pages/hottestyearonrecord.aspx |website=Government of Jersey |language=en |date=1 January 2023}}</ref> For tourism advertising, Jersey often claims to be "the sunniest place in the British Isles", as Jersey has over 1,900 hours of sunlight. Jersey is indeed one of the sunniest places in the British Isles, especially during the warmer months, as it is subject to more influence from the [[Azores High]], which acts as a blocking mechanism for [[Low-pressure area|depressions]] that originate in the North Atlantic and that produce stratiform clouds and rain; these are deflected northwards towards the UK mainland. The [[Azores High]] further reduces the type of convective cloud formations (particularly [[Cumulus cloud|Cumulus]] and [[Stratocumulus cloud|Stratocumulus]]) that are common over more northern and inland areas of the UK during summer through [[Subsidence (atmosphere)|subsidence]]. 

In 2011, Jersey generated controversy for calling itself "the warmest place in the British Isles" during an advertising campaign, as Jersey is neither the place with the highest maximum temperature in the British Isles ({{convert|40.3|°C|°F|1|disp=or}} was recorded in [[Coningsby]], [[Lincolnshire]] in July 2022<ref>{{Cite web |title=Record high temperatures verified |url=https://www.metoffice.gov.uk/about-us/news-and-media/media-centre/weather-and-climate-news/2022/record-high-temperatures-verified |access-date=2024-07-25 |website=Met Office |language=en}}</ref>) or the highest winter temperatures in the British Isles (which would be the [[Isles of Scilly]]).<ref>{{Cite news |date=10 April 2011 |title=Isles of Scilly turn heat on Jersey over 'warmest place in Britain' claim |url=http://www.theguardian.com/uk/2011/apr/10/isles-of-scilly-jersey-warmest-britain |url-status=live |archive-url=https://web.archive.org/web/20220320143448/https://www.theguardian.com/uk/2011/apr/10/isles-of-scilly-jersey-warmest-britain |archive-date=20 March 2022 |access-date=29 March 2023 |work=[[The Guardian]] |language=en}}</ref> 

Typical wind speeds vary between {{convert|20|kph}} and {{convert|40|kph}}. During the cooler months, [[Extratropical cyclone|extratropical cyclones]] can produce [[Gale|gales]] somewhat regularly. 

Snow is very rare in Jersey. The last significant snowfall event occurred in March 2013, when {{convert|14|cm|sigfig=2}} fell.<ref>{{Cite news |date=2013-03-12 |title=In pictures: Jersey gets more than 5.5 inches (14cm) of snowfall |url=https://www.bbc.com/news/world-europe-jersey-21728801 |access-date=2024-07-25 |work=BBC News |language=en-GB}}</ref> The most recent measurable snowfall occurred on 8–9 January 2024, when {{convert|3|to|5|cm|in|sigfig=2}} fell.<ref>{{multiref2|1={{Cite web |title=Jersey Met issues Orange snow warning |website=Government of Jersey |url=https://www.gov.je/News/2024/pages/jerseymetorangesnowwarning.aspx |access-date=2024-07-25 |date=9 January 2024 |language=en|quote=In terms of snowfall accumulations, there is the potential for 3–5cm on higher ground, grass, fields and smaller lanes, with 1–2cm expected at sea level.}} |2={{cite news |title=Flights and schools disrupted after worst snowfall in nearly a decade |url=https://www.itv.com/news/channel/2024-01-09/channel-islands-wake-up-to-snow |work=ITV News |date=10 January 2024}} |3={{cite news |last1=Heath |first1=Richard |title=A topsy-turvy month of rain, wind, frosts and some snow |url=https://jerseyeveningpost.com/news/2024/02/02/a-topsy-turvy-month-of-rain-wind-frosts-and-some-snow/ |work=Jersey Evening Post |date=2 February 2024 |ref=none}} }}</ref> Initially, a fall of only {{cvt|0.5|cm}} had been forecast, so the event was more significant than expected.<ref>{{cite web |title=Weather advice for Jersey – cold temperatures and potential snow |url=https://www.gov.je/News/2024/pages/weatheradviceforjerseycoldtemperaturespotentialsnow.aspx |quote={{nbsp}}... any accumulations of sleet or snow are expected to be minimal, and not more than 0.5cm in Jersey|work=Government of Jersey |date=8 January 2024 |language=en}}</ref>

Extreme weather is rare due to the island's mild climate. Spring and summer thunderstorms originating from the European mainland occasionally occur, but are usually not severe. Thunderstorms [[Advection#Meteorology|advecting]] north from the [[Bay of Biscay]] tend to occur during the summer if the influence of the [[Azores High]] temporarily weakens and a [[cut-off low]] develops in the region. Cool season thunderstorms are more common compared with other parts of Europe, as the relatively warm sea-surface temperatures drive moderate surface-based convection into the cold, dry air aloft. This tends to result in [[Hail|small hail]] and weak [[waterspout]]s driven by convection and frequent shear brought on by [[cold front]]s.{{cn|date=November 2024}}

In November 2023, Jersey was hit by extratropical [[Storm Ciarán]], causing heavy rainfall, extremely high winds with gusts of up to {{convert|104|mph|0}}.<ref>{{Cite tweet |title=As wind speed increases we're seeing an increase in calls. ... |user=JsyFire |number=1719955319512563725}} – Jersey Fire & Rescue </ref> A [[supercell]] thunderstorm associated with the [[cold front]] of this system hit Jersey at around midnight on 2 November 2023. With severe [[wind shear]], exceptional [[storm-relative helicity]] and [[Atmospheric instability|temperature contrast of the upper atmosphere and sea surface]], the storm produced extremely large hail and a tornado, which devastated the eastern half of the Island and was subsequently [[TORRO scale|rated T6/EF3 by TORRO]], making it one of the most severe tornadoes ever recorded in the British Isles.<ref>{{Cite report |title=Jersey Tornado 1 November 2023. TORRO site investigation report |id=(SI20231101_Jersey) Storm Ciarán |last=Horton |first=Sarah |date=8 January 2024 |url=https://www.torro.org.uk/pdf/SI/SI20231101_Jersey.pdf |publisher=Tornado and Storm Research Organisation (TORRO)}}</ref>

The Government of Jersey's official meteorological department provides an accurate five-day forecast for Jersey and Guernsey, including detailed shipping forecasts and aviation forecasts. 

The following table contains the official data for 1981–2010 at Jersey Airport, located {{convert|7.2|km|order=flip}} from St. Helier.

{{Weather box
| location = [[Jersey Airport]], elevation 84m, 1981–2010
| collapsed = 
| metric first = y
| single line = y
| Jan record high C = 14.0
| Feb record high C = 18.0
| Mar record high C = 20.3
| Apr record high C = 25.0
| May record high C = 28.0
| Jun record high C = 33.0
| Jul record high C = 37.9
| Aug record high C = 36.0
| Sep record high C = 30.2
| Oct record high C = 26.0
| Nov record high C = 21.0
| Dec record high C = 16.0
| year record high C = 37.9
| Jan high C = 8.3
| Feb high C = 8.4
| Mar high C = 10.4
| Apr high C = 12.5
| May high C = 15.8
| Jun high C = 18.4
| Jul high C = 20.4
| Aug high C = 20.6
| Sep high C = 18.7
| Oct high C = 15.4
| Nov high C = 11.7
| Dec high C = 9.2
| year high C = 14.2
| Jan mean C = 6.3
| Feb mean C = 6.1
| Mar mean C = 7.9
| Apr mean C = 9.5
| May mean C = 12.6
| Jun mean C = 15.1
| Jul mean C = 17.2
| Aug mean C = 17.5
| Sep mean C = 15.8
| Oct mean C = 13.0
| Nov mean C = 9.6
| Dec mean C = 7.1
| year mean C = 11.5
| Jan low C = 4.3
| Feb low C = 3.8
| Mar low C = 5.3
| Apr low C = 6.5
| May low C = 9.3
| Jun low C = 11.8
| Jul low C = 13.9
| Aug low C = 14.3
| Sep low C = 12.9
| Oct low C = 10.6
| Nov low C = 7.5
| Dec low C = 5.0
| year low C = 8.8
| Jan record low C = -10.3
| Feb record low C = -9.0
| Mar record low C = -3.3
| Apr record low C = -1.6
| May record low C = 0.0
| Jun record low C = 5.9
| Jul record low C = 9.0
| Aug record low C = 7.7
| Sep record low C = 6.0
| Oct record low C = -2.6
| Nov record low C = -3.0
| Dec record low C = -4.0
| year record low C = -10.3
| precipitation colour = green
| Jan precipitation mm = 93.1
| Feb precipitation mm = 68.9
| Mar precipitation mm = 66.1
| Apr precipitation mm = 56.4
| May precipitation mm = 55.6
| Jun precipitation mm = 47.5
| Jul precipitation mm = 44.6
| Aug precipitation mm = 49.5
| Sep precipitation mm = 63.9
| Oct precipitation mm = 103.4
| Nov precipitation mm = 105.4
| Dec precipitation mm = 111.3
| year precipitation mm = 865.8
| Jan sun = 66.1
| Feb sun = 91.6
| Mar sun = 134.0
| Apr sun = 196.5
| May sun = 236.7
| Jun sun = 245.4
| Jul sun = 252.7
| Aug sun = 235.3
| Sep sun = 184.6
| Oct sun = 118.8
| Nov sun = 79.9
| Dec sun = 63.2
| year sun = 1904.8
| source = Met Office<ref>{{Cite web |date=May 2015 |title=Jersey Climate Normals 1981–2010 |url=http://www.metoffice.gov.uk/public/weather/climate/gbwxb1tp2 |access-date=8 May 2015 |publisher=[[Met Office]] |archive-date=21 April 2019 |archive-url=https://web.archive.org/web/20190421214942/https://www.metoffice.gov.uk/public/weather/climate/gbwxb1tp2 |url-status=live }}</ref> and Voodoo Skies<ref>{{Cite web |date=October 2015 |title=Jersey Climate Extremes |url=http://voodooskies.com/weather/united-kingdom/jersey/monthly/temperature |url-status=dead |archive-url=https://web.archive.org/web/20160304060027/http://voodooskies.com/weather/united-kingdom/jersey/monthly/temperature |archive-date=4 March 2016 |access-date=8 October 2015 |publisher=Voodoo Skies}}</ref>
}}