Cromlech is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 8 September 1998. Cromlech.

Cromlech

WRENN ID
late-quartz-bittern
Grade
II
Local Planning Authority
Gwynedd
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
8 September 1998
Type
Cromlech
Address
Cromlech, Glynllifon, Llandwrog
OS grid reference
SH 457 552
Coordinates
53.07171, -4.3044
Source
Cadw listing

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

Description

Cromlech is a miniature structure typical of its kind, featuring a capstone supported by three monoliths. There was previously a tall standing stone beside it, but this has since fallen over. Inside the cromlech, there is a basin.

Local climate

Cromlech 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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Nearby listed buildings

  1. Bridge over Afon Llifon to south-east of Glynllifon House Grade II 114 m
  2. Bridge over Afon Llifon to south of Glynllifon House Grade II 142 m
  3. Children's Mill or Boat House Grade II 166 m
  4. Footbridge over Afon Llifon to east of house Grade II 181 m
  5. Fountain near south-west corner of Glynllifon House Grade II 186 m
  6. Fountain Pool to east of Stable Courtyard Grade II 189 m
  7. Glynllifon Grade I 194 m
  8. The Mill Folly Grotto including stone bridge, south of the Afon Llifon Grade II 212 m
  9. Sundial to rear of Glynllifon House Grade II 217 m
  10. Stable Courtyard at Glynllifon Grade II* 218 m