Wet weather: 1,159 mm (46 in) a year falls on St Arvans, more than on 87% of UK towns
Nights in January average 2.4°C (36°F). Temperatures cover 19°C across the year, low to high. By January nights alone, it runs milder than 82% of UK towns. 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 St Arvans at a glance
Each month’s typical high and low, in °C.
What a year in St Arvans feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 1,159 mm of rain a year
December is the wettest month and July the driest. About 35 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Ross-on-Wye
32 air frosts and 9 days of 25°C a year
On about 32 nights a year the air drops below freezing, and on about under 1 days it stays below freezing all day. About 9 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 Ross-on-Wye
Ross-on-Wye is 18 miles north of St Arvans, 67 m (220 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 | 8.0°C | 2.2°C | 76 mm | 9.0 | 55 |
| February | 8.7°C | 2.1°C | 55 mm | 8.4 | 77 |
| March | 11.2°C | 3.3°C | 53 mm | 4.9 | 118 |
| April | 14.2°C | 5.0°C | 55 mm | 2.0 | 165 |
| May | 17.4°C | 7.8°C | 57 mm | 0.1 | 202 |
| June | 20.3°C | 10.7°C | 56 mm | 0.0 | 201 |
| July | 22.3°C | 12.6°C | 52 mm | 0.0 | 209 |
| August | 21.7°C | 12.5°C | 64 mm | 0.0 | 188 |
| September | 19.1°C | 10.3°C | 57 mm | 0.0 | 143 |
| October | 14.8°C | 7.7°C | 85 mm | 1.2 | 104 |
| November | 10.9°C | 4.6°C | 80 mm | 4.5 | 63 |
| December | 8.3°C | 2.4°C | 79 mm | 8.8 | 47 |
| Year | 14.7°C | 6.8°C | 768 mm | 39 | 1,570 |
Met Office historic station data, Ross-On-Wye, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Kipp & Zonen recorder.
How St Arvans 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 |
|---|---|---|---|
| St Arvans | 20.7°C | 2.4°C | 1,159 mm |
| Tutshill and Sedbury 2.3 mi | 22.0°C 1.3°C warmer | 2.7°C about the same | 902 mm |
| Chepstow 2.5 mi | 21.7°C 1.0°C warmer | 2.6°C about the same | 997 mm |
| Beachley 3.9 mi | 21.4°C 0.7°C warmer | 2.7°C about the same | 989 mm |
| Caer-went 4.9 mi | 21.4°C 0.6°C warmer | 2.8°C about the same | 1,041 mm |
| Portskewett 5.4 mi | 21.6°C 0.9°C warmer | 2.9°C about the same | 850 mm |
| Caldicot 5.7 mi | 21.6°C 0.9°C warmer | 2.9°C about the same | 850 mm |
St Arvans 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 | 2.4°C 36°F | 5.1°C | 113 mm 4.5 in |
| February | 7.6°C 46°F | 1.6°C 35°F | 4.5°C | 92 mm 3.6 in |
| March | 10.0°C 50°F | 2.7°C 37°F | 6.3°C | 80 mm 3.1 in |
| April | 12.9°C 55°F | 4.3°C 40°F | 8.7°C | 77 mm 3.0 in |
| May | 15.9°C 61°F | 6.9°C 44°F | 11.4°C | 81 mm 3.2 in |
| June | 18.7°C 66°F | 9.7°C 50°F | 14.3°C | 76 mm 3.0 in |
| July | 20.7°C 69°F | 11.7°C 53°F | 16.3°C | 74 mm 2.9 in |
| August | 20.3°C 68°F | 11.7°C 53°F | 16.0°C | 101 mm 4.0 in |
| September | 17.8°C 64°F | 9.6°C 49°F | 13.7°C | 84 mm 3.3 in |
| October | 13.8°C 57°F | 7.2°C 45°F | 10.4°C | 122 mm 4.8 in |
| November | 10.0°C 50°F | 4.3°C 40°F | 7.1°C | 127 mm 5.0 in |
| December | 7.5°C 45°F | 2.1°C 36°F | 4.8°C | 132 mm 5.2 in |
| Year | 13.6°C | 6.2°C | 9.9°C | 1,159 mm |
Where St Arvans’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 St Arvans’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 Ross-On-Wye, 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 St Arvans’s climate
How warm does St Arvans get in summer?
July is the warmest month, with average highs of 20.7°C (69°F). About 9 days a year reach 25°C (77°F), fewer than 58% of UK towns.
How cold does St Arvans get in winter?
February nights average 1.6°C (35°F). The air drops below freezing on about 32 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does St Arvans get?
About 1,159 mm (46 in) a year, more than 87% of UK towns. December is the wettest month (132 mm) and July the driest (74 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Ross-on-Wye (18 miles away), averages 1,570 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 St Arvans. 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 St Arvans →
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.