Editing Holyhead (section)

==Climate==

Like the rest of Wales and the [[British Isles]], Holyhead has a [[maritime climate]] (''Cfb'' according to the [[Köppen climate classification]]) with cool summers and mild winters, and often high winds exacerbated by its location by the Irish Sea. The nearest official weather observation station is at [[RAF Valley]], about {{convert|5|mi|km|0|abbr=off|spell=on}} southeast of the town centre.<ref>{{cite web|url=https://hansard.parliament.uk/commons/1987-01-19/debates/107955d9-005a-48de-bb34-2842f46ad19d/SevereWeatherPayments|title=Severe Weather Payments|publisher=Hansard|date=19 January 1987|access-date=27 November 2022}}</ref>

On 23 November 1981, Holyhead was struck by two tornadoes during the record-breaking [[1981 United Kingdom tornado outbreak]]. One of the tornadoes, rated as an F2/T4 tornado, was the strongest recorded out of 104 tornadoes in the entire outbreak, causing damage to around 20 properties in Holyhead and destroying a mobile home.<ref>{{Cite journal | doi=10.1175/WAF-D-15-0131.1|title = Reexamining the United Kingdom's Greatest Tornado Outbreak: Forecasting the Limited Extent of Tornadoes along a Cold Front| journal=Weather and Forecasting| volume=31| issue=3| pages=853–875|year = 2016|last1 = Apsley|first1 = Miriam L.| last2=Mulder| first2=Kelsey J.| last3=Schultz| first3=David M.|bibcode = 2016WtFor..31..853A| url=http://centaur.reading.ac.uk/61279/1/waf-d-15-0131%252E1.pdf}}</ref>

{{Weather box
 | width       = auto
 | metric first = yes
 | single line = yes
 | location    = [[RAF Valley]] (1991–2020)
 | Jan high C = 8.4
 | Feb high C = 8.4
 | Mar high C = 9.8
 | Apr high C = 12.1
 | May high C = 15.0
 | Jun high C = 17.2
 | Jul high C = 18.8
 | Aug high C = 18.8
 | Sep high C = 17.3
 | Oct high C = 14.3
 | Nov high C = 11.3
 | Dec high C = 9.1
 | year high C = 13.4
 | Jan low C = 3.8
 | Feb low C = 3.6
 | Mar low C = 4.5
 | Apr low C = 6.1
 | May low C = 8.6
 | Jun low C = 11.0
 | Jul low C = 12.9
 | Aug low C = 13.1
 | Sep low C = 11.6
 | Oct low C = 9.2
 | Nov low C = 6.6
 | Dec low C = 4.4
 | year low C = 8.0
 | rain colour = green
 | Jan rain mm = 74.6
 | Feb rain mm = 62.0
 | Mar rain mm = 57.0
 | Apr rain mm = 54.4
 | May rain mm = 52.4
 | Jun rain mm = 57.1
 | Jul rain mm = 57.4
 | Aug rain mm = 69.2
 | Sep rain mm = 73.9
 | Oct rain mm = 101.6
 | Nov rain mm = 103.3
 | Dec rain mm = 93.3
 | year rain mm = 856.3
 | unit rain days = 1 mm
 | Jan rain days = 14.1
 | Feb rain days = 11.6
 | Mar rain days = 11.2
 | Apr rain days = 10.9
 | May rain days = 9.3
 | Jun rain days = 9.3
 | Jul rain days = 10.5
 | Aug rain days = 10.6
 | Sep rain days = 11.0
 | Oct rain days = 13.9
 | Nov rain days = 16.3
 | Dec rain days = 15.8
 | year rain days = 144.5
 | Jan sun = 60.6
 | Feb sun = 85.1
 | Mar sun = 131.7
 | Apr sun = 181.8
 | May sun = 233.4
 | Jun sun = 219.3
 | Jul sun = 205.5
 | Aug sun = 187.9
 | Sep sun = 150.7
 | Oct sun = 107.9
 | Nov sun = 62.5
 | Dec sun = 48.3
 | year sun = 1674.7
| source 1 = [[Met Office]]<ref name="MetOffice">{{cite web
|url = https://www.metoffice.gov.uk/research/climate/maps-and-data/uk-climate-averages/gckyby0r2
|title = Valley (Isle of Anglesey) UK climate averages - Met Office
|publisher = Met Office
|access-date = July 5, 2024}}</ref>
}}