Carnon Downs and Devoran sits near the top of UK towns for mild winters
On a normal July day the thermometer tops out near 19.9°C (68°F). By rainfall alone, it ranks wetter than 89% of UK towns. Wet weather is most frequent in December and least in May. The heating season runs November to April: each of those months averages under 10°C.
Met Office 1991–2020 averages for the town itself.
A year in Carnon Downs and Devoran at a glance
Each month’s typical high and low, in °C.
What a year in Carnon Downs and Devoran feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 1,193 mm of rain a year
December is the wettest month and May the driest. About 38 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Camborne
17 air frosts and 3 days of 25°C a year
On about 17 nights a year the air drops below freezing; days that stay below freezing are rare. About 3 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 10 miles west of Carnon Downs and Devoran, 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 Carnon Downs and Devoran 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 |
|---|---|---|---|
| Carnon Downs and Devoran | 19.9°C | 4.2°C | 1,193 mm |
| Perranarworthal 1.4 mi | 19.9°C about the same | 4.1°C about the same | 1,199 mm |
| Mylor Bridge 2.5 mi | 20.5°C 0.5°C warmer | 4.3°C about the same | 1,147 mm |
| Threemilestone 3.0 mi | 19.5°C about the same | 3.9°C about the same | 1,192 mm |
| Truro 3.3 mi | 20.0°C about the same | 3.7°C about the same | 1,144 mm |
| Penryn 3.6 mi | 19.6°C about the same | 4.2°C about the same | 1,322 mm |
| Carharrack 4.0 mi | 19.2°C 0.7°C cooler | 3.8°C about the same | 1,268 mm |
Carnon Downs and Devoran 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 | 9.3°C 49°F | 4.2°C 39°F | 6.7°C | 135 mm 5.3 in |
| February | 9.7°C 49°F | 4.0°C 39°F | 6.7°C | 108 mm 4.3 in |
| March | 10.9°C 52°F | 4.9°C 41°F | 7.9°C | 84 mm 3.3 in |
| April | 13.1°C 56°F | 6.0°C 43°F | 9.5°C | 74 mm 2.9 in |
| May | 15.6°C 60°F | 8.3°C 47°F | 12.0°C | 63 mm 2.5 in |
| June | 18.2°C 65°F | 11.0°C 52°F | 14.7°C | 66 mm 2.6 in |
| July | 19.9°C 68°F | 13.0°C 55°F | 16.5°C | 67 mm 2.6 in |
| August | 19.8°C 68°F | 13.0°C 55°F | 16.4°C | 83 mm 3.3 in |
| September | 18.0°C 64°F | 11.4°C 53°F | 14.8°C | 79 mm 3.1 in |
| October | 15.0°C 59°F | 9.2°C 49°F | 12.1°C | 122 mm 4.8 in |
| November | 11.9°C 53°F | 6.5°C 44°F | 9.2°C | 152 mm 6.0 in |
| December | 10.0°C 50°F | 4.8°C 41°F | 7.4°C | 160 mm 6.3 in |
| Year | 14.3°C | 8.0°C | 11.2°C | 1,193 mm |
Where Carnon Downs and Devoran’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 Carnon Downs and Devoran’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, 10 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 Carnon Downs and Devoran’s climate
How warm does Carnon Downs and Devoran get in summer?
July is the warmest month, with average highs of 19.9°C (68°F). About 3 days a year reach 25°C (77°F), fewer than 85% of UK towns.
How cold does Carnon Downs and Devoran get in winter?
February nights average 4.0°C (39°F). The air drops below freezing on about 17 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Carnon Downs and Devoran get?
About 1,193 mm (47 in) a year, more than 89% of UK towns. December is the wettest month (160 mm) and May the driest (63 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Camborne (10 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 Carnon Downs and Devoran. 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 Carnon Downs and Devoran →
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