Hardly any UK towns see softer January nights than St Dennis
Expect July afternoons of about 19.8°C (68°F). Of all months, November brings the most rain and May the least. By rainfall alone, it ranks wetter than 94% of UK towns. 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 St Dennis at a glance
Each month’s typical high and low, in °C.
What a year in St Dennis feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 1,328 mm of rain a year
November is the wettest month and May the driest. About 44 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Camborne
20 air frosts and 4 days of 25°C a year
On about 20 nights a year the air drops below freezing, and on about under 1 days it stays below freezing all day. About 4 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 Camborne
Camborne is 23 miles south-west of St Dennis, 87 m (285 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 | 9.2°C | 4.9°C | 121 mm | 2.2 | 60 |
| February | 9.1°C | 4.6°C | 95 mm | 2.1 | 82 |
| March | 10.2°C | 5.4°C | 72 mm | 1.1 | 121 |
| April | 12.1°C | 6.6°C | 73 mm | 0.0 | 181 |
| May | 14.5°C | 8.8°C | 61 mm | 0.0 | 208 |
| June | 16.9°C | 11.2°C | 63 mm | 0.0 | 205 |
| July | 18.7°C | 13.2°C | 69 mm | 0.0 | 190 |
| August | 19.0°C | 13.4°C | 79 mm | 0.0 | 180 |
| September | 17.5°C | 12.0°C | 78 mm | 0.0 | 154 |
| October | 14.6°C | 10.0°C | 111 mm | 0.0 | 108 |
| November | 11.8°C | 7.4°C | 130 mm | 0.2 | 68 |
| December | 9.9°C | 5.6°C | 126 mm | 1.7 | 54 |
| Year | 13.6°C | 8.6°C | 1,076 mm | 7 | 1,611 |
Met Office historic station data, Camborne, 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 Dennis 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 Cornwall 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 Dennis | 19.8°C | 3.3°C | 1,328 mm |
| Nanpean 1.0 mi | 19.6°C about the same | 3.2°C about the same | 1,370 mm |
| Foxhole 1.8 mi | 19.6°C about the same | 3.1°C about the same | 1,373 mm |
| Indian Queens, Fraddon and St Columb Road 2.5 mi | 19.8°C about the same | 3.3°C about the same | 1,262 mm |
| St Stephen 2.6 mi | 19.6°C about the same | 3.5°C about the same | 1,365 mm |
| Roche 2.8 mi | 19.7°C about the same | 3.1°C about the same | 1,473 mm |
| Trewoon 3.8 mi | 19.6°C about the same | 3.8°C 0.6°C milder | 1,358 mm |
St Dennis 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 | 3.3°C 38°F | 5.9°C | 141 mm 5.6 in |
| February | 8.6°C 47°F | 3.2°C 38°F | 5.9°C | 112 mm 4.4 in |
| March | 10.1°C 50°F | 4.2°C 39°F | 7.2°C | 89 mm 3.5 in |
| April | 12.5°C 54°F | 5.4°C 42°F | 9.0°C | 86 mm 3.4 in |
| May | 15.3°C 59°F | 7.7°C 46°F | 11.4°C | 75 mm 2.9 in |
| June | 17.9°C 64°F | 10.5°C 51°F | 14.2°C | 79 mm 3.1 in |
| July | 19.8°C 68°F | 12.3°C 54°F | 16.0°C | 96 mm 3.8 in |
| August | 19.6°C 67°F | 12.4°C 54°F | 16.0°C | 100 mm 3.9 in |
| September | 17.7°C 64°F | 10.6°C 51°F | 14.1°C | 91 mm 3.6 in |
| October | 14.4°C 58°F | 8.4°C 47°F | 11.3°C | 137 mm 5.4 in |
| November | 11.2°C 52°F | 5.7°C 42°F | 8.4°C | 168 mm 6.6 in |
| December | 9.2°C 48°F | 3.9°C 39°F | 6.5°C | 154 mm 6.1 in |
| Year | 13.7°C | 7.3°C | 10.5°C | 1,328 mm |
Where St Dennis’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 Dennis’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 Camborne, 23 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 Dennis’s climate
How warm does St Dennis get in summer?
July is the warmest month, with average highs of 19.8°C (68°F). About 4 days a year reach 25°C (77°F), fewer than 83% of UK towns.
How cold does St Dennis get in winter?
February nights average 3.2°C (38°F). The air drops below freezing on about 20 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does St Dennis get?
About 1,328 mm (52 in) a year, more than 94% of UK towns. November is the wettest month (168 mm) and May the driest (75 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Camborne (23 miles away), averages 1,611 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 Dennis. 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 Dennis →
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.