Pontllanfraith is among the wettest of UK towns: 1,435 mm (56 in) of rain a year
On a normal July day the thermometer tops out near 20.7°C (69°F). By July afternoons alone, it runs cooler than 65% of UK towns. Winter and summer sit 19°C apart. For walks and days out, the stretch from June to September brings highs of 18–21°C.
Met Office 1991–2020 averages for the town itself.
A year in Pontllanfraith at a glance
Each month’s typical high and low, in °C.
What a year in Pontllanfraith feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 1,435 mm of rain a year
December is the wettest month and June the driest. About 49 days a year bring 10 mm (0.4 in) or more. 27th wettest of 38 Gwent towns of 2,500+.
Rain by month
Millimetres
43 air frosts and 8 days of 25°C a year
On about 43 nights a year the air drops below freezing, and on about 2 days it stays below freezing all day. About 8 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 Cardiff Bute Park
Cardiff Bute Park is 11 miles south of Pontllanfraith, 9 m (30 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 |
|---|---|---|---|---|
| January | 8.6°C | 2.5°C | 127 mm | 8.1 |
| February | 9.1°C | 2.5°C | 93 mm | 7.5 |
| March | 11.3°C | 3.9°C | 85 mm | 3.9 |
| April | 14.4°C | 5.7°C | 72 mm | 1.4 |
| May | 17.4°C | 8.5°C | 78 mm | 0.0 |
| June | 20.1°C | 11.3°C | 73 mm | 0.0 |
| July | 21.8°C | 13.1°C | 84 mm | 0.0 |
| August | 21.4°C | 12.9°C | 105 mm | 0.0 |
| September | 19.1°C | 10.7°C | 87 mm | 0.0 |
| October | 15.2°C | 8.0°C | 128 mm | 1.0 |
| November | 11.6°C | 4.9°C | 131 mm | 3.7 |
| December | 9.1°C | 2.9°C | 140 mm | 8.3 |
| Year | 14.9°C | 7.2°C | 1,201 mm | 34 |
Met Office historic station data, Cardiff Bute Park, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Campbell-Stokes recorder.
How Pontllanfraith 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 Gwent 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 |
|---|---|---|---|
| Pontllanfraith | 20.7°C | 1.8°C | 1,435 mm |
| Blackwood 1.1 mi | 20.4°C about the same | 1.7°C about the same | 1,538 mm |
| Fleur-de-lis and Pengam 1.4 mi | 20.4°C about the same | 2.0°C about the same | 1,637 mm |
| Maesycwmmer 1.5 mi | 20.4°C about the same | 2.2°C about the same | 1,653 mm |
| Oakdale 1.8 mi | 20.6°C about the same | 1.5°C about the same | 1,440 mm |
| Ystrad Mynach 1.8 mi | 20.4°C about the same | 2.0°C about the same | 1,637 mm |
| Tir-y-berth and Glan-y-nant 1.9 mi | 20.4°C about the same | 1.9°C about the same | 1,525 mm |
Pontllanfraith 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 | 7.2°C 45°F | 1.8°C 35°F | 4.5°C | 157 mm 6.2 in |
| February | 7.6°C 46°F | 1.7°C 35°F | 4.6°C | 122 mm 4.8 in |
| March | 9.8°C 50°F | 2.8°C 37°F | 6.3°C | 102 mm 4.0 in |
| April | 13.0°C 55°F | 4.5°C 40°F | 8.8°C | 84 mm 3.3 in |
| May | 16.2°C 61°F | 7.3°C 45°F | 11.7°C | 88 mm 3.4 in |
| June | 18.9°C 66°F | 10.2°C 50°F | 14.6°C | 81 mm 3.2 in |
| July | 20.7°C 69°F | 12.0°C 54°F | 16.3°C | 88 mm 3.5 in |
| August | 20.1°C 68°F | 11.9°C 53°F | 16.1°C | 105 mm 4.1 in |
| September | 17.7°C 64°F | 9.7°C 49°F | 13.6°C | 107 mm 4.2 in |
| October | 13.7°C 57°F | 7.2°C 45°F | 10.4°C | 164 mm 6.4 in |
| November | 10.0°C 50°F | 4.2°C 40°F | 7.1°C | 160 mm 6.3 in |
| December | 7.6°C 46°F | 2.2°C 36°F | 4.9°C | 177 mm 7.0 in |
| Year | 13.5°C | 6.3°C | 9.9°C | 1,435 mm |
Where Pontllanfraith’s numbers come from
Averages over 30 years, not a forecast.
- Mean temperature, rain and day counts: HadUK-Grid 1991–2020 averages for the 2 Met Office 2 km grid squares whose centre lies inside Pontllanfraith’s built-up area.
- 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 Cardiff Bute Park, 11 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 Pontllanfraith’s climate
How warm does Pontllanfraith get in summer?
July is the warmest month, with average highs of 20.7°C (69°F). About 8 days a year reach 25°C (77°F), fewer than 64% of UK towns.
How cold does Pontllanfraith get in winter?
February nights average 1.7°C (35°F). The air drops below freezing on about 43 nights a year, and about 2 days a year stay below freezing all day.
How much rain does Pontllanfraith get?
About 1,435 mm (56 in) a year, more than 95% of UK towns. December is the wettest month (177 mm) and June the driest (81 mm).
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 Pontllanfraith. 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 Pontllanfraith →
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.