Ynysddu sits near the top of UK towns for rain, with 1,464 mm (58 in) a year
Winter’s chill peaks in January, at about 1.3°C (34°F) after dark. Wet weather is most frequent in January and least in July. In January, nights here are colder than in 84% of UK towns. Central heating does most of its work from November to April, in months below 10°C on average.
Met Office 1991–2020 averages for the town itself.
A year in Ynysddu at a glance
Each month’s typical high and low, in °C.
What a year in Ynysddu feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 1,464 mm of rain a year
January is the wettest month and July the driest. About 57 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
49 air frosts and 6 days of 25°C a year
On about 49 nights a year the air drops below freezing, and on about 3 days it stays below freezing all day. About 6 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 9.5 miles south of Ynysddu, 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 Ynysddu 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 |
|---|---|---|---|
| Ynysddu | 20.5°C | 1.3°C | 1,464 mm |
| Cwmfelinfach 0.7 mi | 20.8°C about the same | 1.4°C about the same | 1,450 mm |
| Maesycwmmer 2.0 mi | 20.4°C about the same | 2.2°C 0.9°C milder | 1,653 mm |
| Pontllanfraith 2.0 mi | 20.7°C about the same | 1.8°C 0.5°C milder | 1,435 mm |
| Llanbradach 2.2 mi | 21.1°C 0.6°C warmer | 1.7°C about the same | 1,537 mm |
| Bedwas 2.3 mi | 21.0°C 0.6°C warmer | 2.0°C 0.7°C milder | 1,446 mm |
| Trethomas 2.4 mi | 21.0°C 0.6°C warmer | 1.9°C 0.6°C milder | 1,444 mm |
Ynysddu 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 | 6.7°C 44°F | 1.3°C 34°F | 4.0°C | 179 mm 7.1 in |
| February | 7.4°C 45°F | 1.5°C 35°F | 4.4°C | 120 mm 4.7 in |
| March | 9.7°C 49°F | 2.6°C 37°F | 6.2°C | 102 mm 4.0 in |
| April | 12.8°C 55°F | 4.3°C 40°F | 8.6°C | 88 mm 3.5 in |
| May | 16.0°C 61°F | 7.1°C 45°F | 11.5°C | 91 mm 3.6 in |
| June | 18.7°C 66°F | 10.0°C 50°F | 14.4°C | 88 mm 3.5 in |
| July | 20.5°C 69°F | 11.8°C 53°F | 16.2°C | 87 mm 3.4 in |
| August | 20.0°C 68°F | 11.7°C 53°F | 15.9°C | 110 mm 4.3 in |
| September | 17.5°C 64°F | 9.5°C 49°F | 13.5°C | 105 mm 4.1 in |
| October | 13.6°C 56°F | 7.0°C 45°F | 10.3°C | 160 mm 6.3 in |
| November | 9.9°C 50°F | 4.1°C 39°F | 7.0°C | 160 mm 6.3 in |
| December | 7.4°C 45°F | 2.0°C 36°F | 4.7°C | 174 mm 6.9 in |
| Year | 13.3°C | 6.1°C | 9.7°C | 1,464 mm |
Where Ynysddu’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 Ynysddu’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 Cardiff Bute Park, 9.5 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 Ynysddu’s climate
How warm does Ynysddu get in summer?
July is the warmest month, with average highs of 20.5°C (69°F). About 6 days a year reach 25°C (77°F), fewer than 72% of UK towns.
How cold does Ynysddu get in winter?
January nights average 1.3°C (34°F). The air drops below freezing on about 49 nights a year, and about 3 days a year stay below freezing all day.
How much rain does Ynysddu get?
About 1,464 mm (58 in) a year, more than 96% of UK towns. January is the wettest month (179 mm) and July the driest (87 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 Ynysddu. 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 Ynysddu →
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