Tower (Twr Bach) is a Grade II listed building in the Isle of Anglesey local planning authority area, Wales. First listed on 30 January 1968. Tower.

Tower (Twr Bach)

WRENN ID
gilded-soffit-bracken
Grade
II
Local Planning Authority
Isle of Anglesey
Constituency
Ynys Môn MP: Llinos Medi (PC)
Country
Wales
Date first listed
30 January 1968
Type
Tower
Address
Tower (Twr Bach), Llanddwyn Island, Rhosyr
OS grid reference
SH 386 624
Coordinates
53.13427, -4.41288
Source
Cadw listing

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

Description

Twr Bach is a circular day-mark tower constructed as a landmark for shipping. It is made of local rubble and features tapering walls topped with a saucer dome. At the base, there is a large square-headed doorway.

Local climate

Tower (Twr Bach) 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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