Tan-y-Castell Monument is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 17 February 1997. Monument.
Tan-y-Castell Monument
- WRENN ID
- upper-casement-kestrel
- Grade
- II
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Bangor Aberconwy MP: Claire Hughes (Lab)
- Country
- Wales
- Date first listed
- 17 February 1997
- Type
- Monument
- Address
- Tan-y-Castell Monument, Dolwyddelan Castle, Dolwyddelan, Conwy
- OS grid reference
- SH 724 523
- Coordinates
- 53.0533, -3.90381
- Source
- Cadw listing
Description
The Tan-y-Castell Monument is a columnar structure made of brown specked marble, standing approximately 7 meters high. It features three cylindrical stages set on a stepped plinth made of cement-rendered rubble. Surrounding the monument is a D-shaped enclosure with cast-iron railings. The monument includes a two-stage marble column resting on a square, chamfered marble base, with moulded bases and abaci for each section. The lower, broader section has a recessed inscription plaque that reads in raised lettering: "In memory of 4 eminent brothers, John, William, David, and Richard Jones: Three ministers and one elder, 1796-1885." The decoration on this section is panelled and made with inlaid lighter marble. The base of the upper section features inscribed panels that say: "eloquence, music, theology, poetry." At the top of the monument is a large urn finial.
Local climate
Tan-y-Castell Monument sits in one of the wettest parts of the UK, with an average of 1,260 mm of rain a year. This makes it wetter than 93% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 89% of listed buildings.
It experiences an average of 49 freeze-thaw cycles a year, more than 91% of listed buildings. Of these, 30 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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