St. Teilo's Well is a Grade II listed building in the Cardiff local planning authority area, Wales. First listed on 19 May 1975. Well.

St. Teilo's Well

WRENN ID
sombre-footing-solstice
Grade
II
Local Planning Authority
Cardiff
Constituency
Cardiff West MP: Mr Alex Barros-Curtis (Lab)
Country
Wales
Date first listed
19 May 1975
Type
Well
Address
St. Teilo's Well, Llandaff
OS grid reference
ST 155 780
Coordinates
51.49485, -3.21794
Source
Cadw listing

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

Description

St. Teilo's Well is an ancient well located on a spring line at the edge of a ridge above the Cathedral. The well is currently covered by a stone slab and is set into a possibly 18th-century rubble wall beneath White House Cottage. It is framed by a 20th-century rubble opening that features an iron grille.

Local climate

St. Teilo's Well sits in a wetter-than-average part of the UK, with an average of 1,080 mm of rain a year. This makes it wetter than 86% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 87% of listed buildings.

It experiences an average of 22 freeze-thaw cycles a year, fewer than 77% of listed buildings. Of these, 8 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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  • Detailed attributes — period, style, materials, features
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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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  4. 2 High Street Grade II 30 m
  5. 4 High Street Grade II 34 m
  6. Garden Wall of Nos. 1 & 2 White House Grade II 35 m
  7. 1 The Cathedral Green Grade II 35 m
  8. No. 2 White House Grade II 37 m
  9. 3 The Cathedral Green Grade II 40 m
  10. 6 High Street Grade II 43 m