Sundial at the Church of St Twrog is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 30 September 1999. Monument.
Sundial at the Church of St Twrog
- WRENN ID
- fossil-forge-indigo
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 30 September 1999
- Type
- Monument
- Address
- Sundial at the Church of St Twrog, Llandwrog
- OS grid reference
- SH 450 560
- Coordinates
- 53.0794, -4.31407
- Source
- Cadw listing
Description
The sundial at the Church of St Twrog is made of local stone and features a tapering baluster shaft with a moulded capping and plinth, all resting on an octagonal base. At the top, there is an inscribed brass plate with a gnomon. The sundial is situated on a mound that covers a stone chamber with a brick barrel vault, which can be accessed by a steep flight of slate steps.
Local climate
Sundial at the Church of St Twrog sits in one of the wettest parts of the UK, with an average of 1,370 mm of rain a year. This makes it wetter than 97% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 98% of listed buildings.
It experiences an average of 20 freeze-thaw cycles a year, fewer than 78% of listed buildings. Of these, 9 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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- No EPC on record for this property
- No sale records on file
- No related consent applications matched
- Detailed attributes — period, style, materials, features
- Flood risk assessment
- Radon risk assessment
- Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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