Midwinter lows in Chelston stay above those of 81% of UK towns
Expect July afternoons of about 21.8°C (71°F). Rain is plentiful here, more than falls on 71% of UK towns. Wet weather is most frequent in December and least in May. Keep the boiler serviced for the months from November to April, which average under 10°C.
Met Office 1991–2020 averages for the town itself.
A year in Chelston at a glance
Each month’s typical high and low, in °C.
What a year in Chelston feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 914 mm of rain a year
December is the wettest month and May the driest. About 25 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Yeovilton
33 air frosts and 11 days of 25°C a year
On about 33 nights a year the air drops below freezing, and on about under 1 days it stays below freezing all day. About 11 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 Yeovilton
Yeovilton is 24 miles east of Chelston, 20 m (66 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 | 8.6°C | 2.0°C | 70 mm | 10.0 | 58 |
| February | 9.0°C | 1.8°C | 51 mm | 9.7 | 77 |
| March | 11.2°C | 3.0°C | 49 mm | 7.6 | 114 |
| April | 13.9°C | 4.5°C | 52 mm | 3.8 | 163 |
| May | 17.1°C | 7.4°C | 47 mm | 0.5 | 191 |
| June | 19.9°C | 10.3°C | 58 mm | 0.0 | 188 |
| July | 21.9°C | 12.2°C | 50 mm | 0.0 | 192 |
| August | 21.6°C | 12.2°C | 61 mm | 0.0 | 175 |
| September | 19.2°C | 10.0°C | 53 mm | 0.0 | 142 |
| October | 15.3°C | 7.6°C | 81 mm | 1.8 | 104 |
| November | 11.5°C | 4.4°C | 80 mm | 5.5 | 69 |
| December | 9.0°C | 2.3°C | 77 mm | 10.3 | 52 |
| Year | 14.9°C | 6.5°C | 728 mm | 49 | 1,524 |
Met Office historic station data, Yeovilton, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Kipp & Zonen recorder.
How Chelston 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 Somerset 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 |
|---|---|---|---|
| Chelston | 21.8°C | 2.4°C | 914 mm |
| Wellington 1.2 mi | 21.8°C about the same | 2.4°C about the same | 917 mm |
| Rockwell Green 2.2 mi | 21.2°C 0.6°C cooler | 2.3°C about the same | 1,004 mm |
| Milverton 3.6 mi | 21.7°C about the same | 2.2°C about the same | 878 mm |
| Trull 3.6 mi | 21.9°C about the same | 2.3°C about the same | 851 mm |
| Norton Fitzwarren 3.8 mi | 22.0°C about the same | 2.4°C about the same | 809 mm |
| Cotford St Luke 3.8 mi | 21.7°C about the same | 2.3°C about the same | 871 mm |
Chelston 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 | 8.6°C 47°F | 2.4°C 36°F | 5.4°C | 96 mm 3.8 in |
| February | 8.9°C 48°F | 2.4°C 36°F | 5.6°C | 74 mm 2.9 in |
| March | 11.2°C 52°F | 3.5°C 38°F | 7.5°C | 62 mm 2.4 in |
| April | 14.2°C 58°F | 4.5°C 40°F | 9.4°C | 63 mm 2.5 in |
| May | 17.3°C 63°F | 7.1°C 45°F | 12.2°C | 50 mm 2.0 in |
| June | 20.1°C 68°F | 10.5°C 51°F | 15.2°C | 57 mm 2.3 in |
| July | 21.8°C 71°F | 12.0°C 54°F | 17.0°C | 59 mm 2.3 in |
| August | 21.6°C 71°F | 11.9°C 53°F | 16.9°C | 66 mm 2.6 in |
| September | 18.9°C 66°F | 10.2°C 50°F | 14.6°C | 69 mm 2.7 in |
| October | 15.1°C 59°F | 7.8°C 46°F | 11.5°C | 96 mm 3.8 in |
| November | 11.4°C 53°F | 5.1°C 41°F | 8.2°C | 109 mm 4.3 in |
| December | 9.2°C 48°F | 3.3°C 38°F | 5.8°C | 113 mm 4.4 in |
| Year | 14.9°C | 6.7°C | 10.8°C | 914 mm |
Where Chelston’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 Chelston’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 Yeovilton, 24 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 Chelston’s climate
How warm does Chelston get in summer?
July is the warmest month, with average highs of 21.8°C (71°F). About 11 days a year reach 25°C (77°F), more than 52% of UK towns.
How cold does Chelston get in winter?
January nights average 2.4°C (36°F). The air drops below freezing on about 33 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Chelston get?
About 914 mm (36 in) a year, more than 71% of UK towns. December is the wettest month (113 mm) and May the driest (50 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Yeovilton (24 miles away), averages 1,524 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 Chelston. 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 Chelston →
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.