More rain falls on Parc-Seymour than on 89% of UK towns: 1,188 mm (47 in) a year
Expect July afternoons of about 21.2°C (70°F). Seasons differ by 20°C, from the coldest nights to the warmest afternoons. By frosts alone, it ranks gentler than 73% of UK towns. The outdoor season runs from June to September, with highs of 18–21°C.
Met Office 1991–2020 averages for the town itself.
A year in Parc-Seymour at a glance
Each month’s typical high and low, in °C.
What a year in Parc-Seymour feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 1,188 mm of rain a year
December is the wettest month and April the driest. About 35 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
36 air frosts and 13 days of 25°C a year
On about 36 nights a year the air drops below freezing, and on about 1 days it stays below freezing all day. About 13 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 17 miles south-west of Parc-Seymour, 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 Parc-Seymour 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 |
|---|---|---|---|
| Parc-Seymour | 21.2°C | 2.0°C | 1,188 mm |
| Underwood 2.1 mi | 22.2°C 1.0°C warmer | 2.5°C 0.5°C milder | 1,001 mm |
| Langstone 2.4 mi | 22.1°C 1.0°C warmer | 2.4°C about the same | 1,108 mm |
| Undy and Magor 3.1 mi | 22.3°C 1.1°C warmer | 2.7°C 0.7°C milder | 979 mm |
| Rogiet 4.0 mi | 21.6°C about the same | 2.9°C 0.9°C milder | 973 mm |
| Caer-went 4.0 mi | 21.4°C about the same | 2.8°C 0.8°C milder | 1,041 mm |
| Caerleon 4.7 mi | 22.1°C 1.0°C warmer | 2.3°C about the same | 1,116 mm |
Parc-Seymour 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 | 7.8°C 46°F | 2.0°C 36°F | 4.9°C | 117 mm 4.6 in |
| February | 7.8°C 46°F | 1.3°C 34°F | 4.5°C | 93 mm 3.7 in |
| March | 10.1°C 50°F | 2.3°C 36°F | 6.2°C | 84 mm 3.3 in |
| April | 13.2°C 56°F | 4.0°C 39°F | 8.6°C | 71 mm 2.8 in |
| May | 16.4°C 62°F | 6.7°C 44°F | 11.6°C | 79 mm 3.1 in |
| June | 19.3°C 67°F | 9.6°C 49°F | 14.5°C | 76 mm 3.0 in |
| July | 21.2°C 70°F | 11.5°C 53°F | 16.3°C | 79 mm 3.1 in |
| August | 20.6°C 69°F | 11.4°C 53°F | 16.0°C | 106 mm 4.2 in |
| September | 18.2°C 65°F | 9.5°C 49°F | 13.8°C | 87 mm 3.4 in |
| October | 14.0°C 57°F | 6.8°C 44°F | 10.4°C | 131 mm 5.2 in |
| November | 10.2°C 50°F | 3.8°C 39°F | 7.0°C | 128 mm 5.0 in |
| December | 7.4°C 45°F | 1.6°C 35°F | 4.5°C | 136 mm 5.4 in |
| Year | 13.9°C | 5.9°C | 9.9°C | 1,188 mm |
Where Parc-Seymour’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 Parc-Seymour’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, 17 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 Parc-Seymour’s climate
How warm does Parc-Seymour get in summer?
July is the warmest month, with average highs of 21.2°C (70°F). About 13 days a year reach 25°C (77°F), more than 62% of UK towns.
How cold does Parc-Seymour get in winter?
February nights average 1.3°C (34°F). The air drops below freezing on about 36 nights a year, and about 1 days a year stay below freezing all day.
How much rain does Parc-Seymour get?
About 1,188 mm (47 in) a year, more than 89% of UK towns. December is the wettest month (136 mm) and April the driest (71 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 Parc-Seymour. 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 Parc-Seymour →
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