Llanddwyn Lighthouse is a Grade II listed building in the Isle of Anglesey local planning authority area, Wales. First listed on 29 March 1996. Lighthouse.

Llanddwyn Lighthouse

WRENN ID
gilded-gable-thunder
Grade
II
Local Planning Authority
Isle of Anglesey
Constituency
Ynys Môn MP: Llinos Medi (PC)
Country
Wales
Date first listed
29 March 1996
Type
Lighthouse
Address
Llanddwyn Lighthouse, Llanddwyn Island, Rhosyr
OS grid reference
SH 385 625
Coordinates
53.13521, -4.41556
Source
Cadw listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

Llanddwyn Lighthouse is a circular tower constructed with lime-washed render over rubble, topped with a renewed shallow conical slate roof. The tower has four stages, featuring a doorway on the north side flanked by small windows, and a single window on each of the two floors above, with the window details having been renewed. On the south side, there is a lean-to lantern room with large windows that overlook the sea. The tower is surrounded by low rubble walls, which also serve as parapets for the inclined access leading to its elevated rock site.

Local climate

Llanddwyn Lighthouse sits in one of the wettest parts of the UK, with an average of 1,180 mm of rain a year. This makes it wetter than 90% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 96% of listed buildings.

It experiences an average of 11 freeze-thaw cycles a year, fewer than 90% of listed buildings. Of these, 3 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.

Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.

More on this building

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  • Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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