St Justinian's Well is a Grade II listed building in the Pembrokeshire Coast National Park local planning authority area, Wales. First listed on 28 July 1992. House, terrace.

St Justinian's Well

WRENN ID
waiting-chimney-finch
Grade
II
Local Planning Authority
Pembrokeshire Coast National Park
Constituency
Mid and South Pembrokeshire MP: Henry Tufnell (Lab)
Country
Wales
Date first listed
28 July 1992
Type
House, terrace
Address
St Justinian's Well, Porthstinian/St Justinians, St. David's and the Cathedral Close
OS grid reference
SM 723 252
Coordinates
51.87903, -5.30819
Source
Cadw listing

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

Description

St Justinian's Well is a rubble stone enclosure built over a fresh water spring. The structure has a rounded shape with a flat front facing west. It features a boarded door and a monopitch stone slab roof. The enclosure measures approximately 1.5 meters wide and deep, and stands about 1.2 meters high.

Local climate

St Justinian's Well sits in a wetter-than-average part of the UK, with an average of 1,050 mm of rain a year. This makes it wetter than 85% 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 3 freeze-thaw cycles a year, fewer than 99% of listed buildings. Of these, 1 follows 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
  • 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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Nearby listed buildings

  1. Old Lifeboat House Grade II 43 m
  2. Lifeboat House Grade II 75 m
  3. Ruins of St Justinian's Chapel Grade I 83 m
  4. Watch Tower to NW. of St. Justinian's Grade II 137 m
  5. Rhosson Ganol Grade II 402 m
  6. Outbuilding on S.Side of Farmyard at Rhosson Ganol Grade II 451 m
  7. Well-Head opposite Rhosson Farm Grade II 479 m
  8. Rhosson Uchaf/Rhosson Farmhouse Grade II* 527 m
  9. Disused Methodist School Room Grade II 594 m
  10. Treginnis Uchaf/upper Treginnis Grade II 895 m