St Dyfnog's Well is a Grade II listed building in the Denbighshire local planning authority area, Wales. First listed on 29 November 1999. Well.

St Dyfnog's Well

WRENN ID
veiled-transept-ochre
Grade
II
Local Planning Authority
Denbighshire
Constituency
Bangor Aberconwy MP: Claire Hughes (Lab)
Country
Wales
Date first listed
29 November 1999
Type
Well
Address
St Dyfnog's Well, Llanrhaeadr, Llanrhaeadr-Yng-Nghinmeirch
OS grid reference
SJ 079 633
Coordinates
53.15931, -3.37815
Source
Cadw listing

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

Description

St Dyfnog's Well is a sunken rectangular bath or basin, measuring approximately 3 meters by 6 meters, with dressed sandstone sides. At the northeast corner, there are four sandstone steps that lead down into the basin. The southeast corner features an irregular outlet with a segmental arch made of rough-dressed limestone, located about 2 meters away. This arch bridges a stream that flows from the basin through the outlet and continues down the hill, passing the churchyard on the south side. Water enters the basin at the west end, where there is a natural spring within a cave, accompanied by an irregular arrangement of dressed and rough-dressed sections of stone, which likely relate to a former built structure associated with the well.

Local climate

St Dyfnog's Well sits in a wetter-than-average part of the UK, with an average of 960 mm of rain a year. This makes it wetter than 75% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 59% of listed buildings.

It experiences an average of 28 freeze-thaw cycles a year, fewer than 68% of listed buildings. Of these, 15 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.

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