Telford Milestone (21) is a Grade II listed building in the Isle of Anglesey local planning authority area, Wales. First listed on 21 April 1998. Milestone.

Telford Milestone (21)

WRENN ID
long-turret-hyssop
Grade
II
Local Planning Authority
Isle of Anglesey
Constituency
Ynys Môn MP: Llinos Medi (PC)
Country
Wales
Date first listed
21 April 1998
Type
Milestone
Address
Telford Milestone (21), Llanfairpwllgwyngyll, Llanfair Pwllgwyngyll
OS grid reference
SH 542 716
Coordinates
53.22215, -4.18492
Source
Cadw listing

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

Description

The Telford Milestone is a Grade II listed structure made of dressed Anglesey limestone. It features a shallow triangular head and raking chamfered sides. There is a cast iron inset plate with white lettering on a black background that reads: HOLY- / HEAD / 21 / MONA / 8 / BANGOR / 4.

Local climate

Telford Milestone (21) sits in one of the wettest parts of the UK, with an average of 1,210 mm of rain a year. This makes it wetter than 92% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 93% of listed buildings.

It experiences an average of 23 freeze-thaw cycles a year, fewer than 75% of listed buildings. Of these, 11 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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