Photo: Eric Jones · CC BY-SA 2.0Clwt-y-bont is among the wettest of UK towns: 2,028 mm (80 in) of rain a year
January nights here settle around 2.7°C (37°F). Only about 21 nights a year bring a frost, fewer than in 94% of UK towns. Only 16°C separates winter nights from summer afternoons. For walks and days out, the stretch from June to August brings highs of 17–19°C.
Met Office 1991–2020 averages for the town itself.
A year in Clwt-y-bont at a glance
Each month’s typical high and low, in °C.
What a year in Clwt-y-bont feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 2,028 mm of rain a year
November is the wettest month and May the driest. About 67 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Valley (Anglesey)
21 air frosts and 3 days of 25°C a year
On about 21 nights a year the air drops below freezing; days that stay below freezing are rare. About 3 days a year reach 25°C (77°F).
Day counts are 1991–2020 averages from the Met Office’s 2 km grid. The Met Office calls a day of 25°C or more a summer day and a night below 0°C an air frost; ground frosts, on grass, come more often.
The Met Office station at Valley (Anglesey)
Valley (Anglesey) is 18 miles north-west of Clwt-y-bont, 10 m (33 ft) above sea level. It is the nearest of the 37 long-running stations the Met Office publishes in full.
| Month | High | Low | Rain | Air frosts | Sun (hours) |
|---|---|---|---|---|---|
| January | 8.4°C | 3.8°C | 75 mm | 5.2 | 58 |
| February | 8.4°C | 3.6°C | 62 mm | 4.8 | 81 |
| March | 9.8°C | 4.5°C | 57 mm | 2.4 | 126 |
| April | 12.1°C | 6.1°C | 54 mm | 0.5 | 173 |
| May | 15.0°C | 8.6°C | 52 mm | 0.0 | 219 |
| June | 17.2°C | 11.0°C | 57 mm | 0.0 | 203 |
| July | 18.8°C | 12.9°C | 58 mm | 0.0 | 190 |
| August | 18.8°C | 13.1°C | 69 mm | 0.0 | 176 |
| September | 17.3°C | 11.6°C | 74 mm | 0.0 | 143 |
| October | 14.3°C | 9.2°C | 102 mm | 0.1 | 101 |
| November | 11.3°C | 6.6°C | 104 mm | 0.7 | 59 |
| December | 9.1°C | 4.4°C | 94 mm | 4.2 | 46 |
| Year | 13.4°C | 8.0°C | 857 mm | 18 | 1,575 |
Met Office historic station data, Valley, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Kipp & Zonen recorder.
How Clwt-y-bont compares
Against the 2,537 towns and cities of 2,500 or more across the UK, each with its own Met Office averages, and its place among Gwynedd towns that size.
Nearby towns’ climate
The nearest towns of 1,000+ within 12 miles: a hill, a valley or the sea can make a real difference over a few miles.
| Town | July high | January low | Rain a year |
|---|---|---|---|
| Clwt-y-bont | 18.9°C | 2.7°C | 2,028 mm |
| Llanberis 1.9 mi | 17.6°C 1.3°C cooler | 2.6°C about the same | 2,530 mm |
| Llanrug 2.5 mi | 19.3°C about the same | 3.1°C about the same | 1,597 mm |
| Tregarth 3.4 mi | 18.5°C about the same | 3.0°C about the same | 1,629 mm |
| Bethel 3.4 mi | 19.3°C about the same | 3.1°C about the same | 1,569 mm |
| Bethesda 3.8 mi | 17.5°C 1.5°C cooler | 2.6°C about the same | 2,116 mm |
| Y Felinheli 4.1 mi | 20.0°C 1.1°C warmer | 3.4°C 0.7°C milder | 1,076 mm |
Clwt-y-bont weather by month
Average daily high and low, mean temperature and rain, 1991–2020, for the town itself (the Met Office’s HadUK-Grid).
| Month | High | Low | Mean | Rain |
|---|---|---|---|---|
| January | 7.7°C 46°F | 2.7°C 37°F | 5.3°C | 199 mm 7.8 in |
| February | 8.1°C 46°F | 2.8°C 37°F | 5.4°C | 168 mm 6.6 in |
| March | 9.7°C 50°F | 3.7°C 39°F | 6.7°C | 144 mm 5.7 in |
| April | 11.9°C 53°F | 5.2°C 41°F | 8.6°C | 130 mm 5.1 in |
| May | 15.4°C 60°F | 8.1°C 47°F | 11.7°C | 106 mm 4.2 in |
| June | 17.5°C 63°F | 10.4°C 51°F | 13.9°C | 116 mm 4.5 in |
| July | 18.9°C 66°F | 12.1°C 54°F | 15.4°C | 131 mm 5.2 in |
| August | 18.6°C 65°F | 12.2°C 54°F | 15.4°C | 147 mm 5.8 in |
| September | 16.8°C 62°F | 10.5°C 51°F | 13.6°C | 168 mm 6.6 in |
| October | 13.6°C 56°F | 8.1°C 47°F | 10.8°C | 215 mm 8.5 in |
| November | 10.5°C 51°F | 5.6°C 42°F | 8.0°C | 259 mm 10.2 in |
| December | 8.3°C 47°F | 3.4°C 38°F | 5.9°C | 245 mm 9.6 in |
| Year | 13.1°C | 7.1°C | 10.1°C | 2,028 mm |
Where Clwt-y-bont’s numbers come from
Averages over 30 years, not a forecast.
- Mean temperature, rain and day counts: HadUK-Grid 1991–2020 averages for the Met Office 2 km grid square nearest Clwt-y-bont’s centre (the town is smaller than one square).
- Highs and lows: the Met Office publishes average daily maxima and minima on its 12 km grid; each is moved by the difference between the town’s 2 km mean temperature and the 12 km square’s, which carries the town’s own height and setting over.
- Weather station and sunshine: Met Office historic station data for Valley, 18 miles away, months of 1991–2020 averaged.
- Comparisons: every town and city of 2,500 or more across the UK, all four nations, read the same way.
Met Office HadUK-Grid · Met Office Climate Data Portal · Historic station data. Open Government Licence v3.0.
Questions about Clwt-y-bont’s climate
How warm does Clwt-y-bont get in summer?
July is the warmest month, with average highs of 18.9°C (66°F). About 3 days a year reach 25°C (77°F), fewer than 84% of UK towns.
How cold does Clwt-y-bont get in winter?
January nights average 2.7°C (37°F). The air drops below freezing on about 21 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Clwt-y-bont get?
About 2,028 mm (80 in) a year, more than almost every UK town. November is the wettest month (259 mm) and May the driest (106 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Valley (Anglesey) (18 miles away), averages 1,575 hours of bright sunshine a year. Sunshine isn’t on the town grid, so this is the station’s figure.
Where do these figures come from?
The Met Office’s HadUK-Grid 1991–2020 averages, which turn thousands of weather stations into a map of the UK in 2 km squares; the page reads the squares inside Clwt-y-bont. They are 30-year averages, not a forecast.
Contains Met Office data © Crown copyright 2026, Open Government Licence v3.0. HadUK-Grid 1991–2020 averages via the Met Office Climate Data Portal; station averages from Met Office historic station data. Today’s forecast for Clwt-y-bont →
Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2026. Contains OS data © Crown copyright and database right 2026 (ONS boundaries). Northern Ireland: Source: NISRA; contains Land & Property Services data and Ordnance Survey of Northern Ireland information, © Crown copyright, licensed under the Open Government Licence v3.0. Scotland: contains National Records of Scotland data, Registers of Scotland data and SEPA data, © Crown copyright / © SEPA 2025, licensed under the Open Government Licence v3.0.