Threemilestone has some of the mildest winter nights among UK towns
A typical January night drops to 3.9°C (39°F) and a July afternoon reaches 19.5°C (67°F); 1,192 mm (47 in) of rain falls in a year. Summers, though, bring few warm days: about 3 a year reach 25°C, fewer than in 96% of UK towns. Rain is plentiful here, more than falls on 92% of UK towns.
A year in Threemilestone at a glance
Each month’s typical high and low, in °C.
What a year in Threemilestone feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 1,192 mm of rain a year
December is the wettest month and May the driest. About 37 days a year bring 10 mm (0.4 in) or more. 20th wettest of 35 Cornwall towns of 2,500+.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Camborne
18 air frosts and 3 days of 25°C a year
On about 18 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 9.9 miles west of Threemilestone, 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 Threemilestone compares
Against the 2,178 towns and cities of 2,500 or more in England and Wales, 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 |
|---|---|---|---|
| Threemilestone | 19.5°C | 3.9°C | 1,192 mm |
| Shortlanesend 2.4 mi | 19.9°C about the same | 3.6°C about the same | 1,093 mm |
| Truro 2.4 mi | 20.0°C 0.5°C warmer | 3.7°C about the same | 1,144 mm |
| Carnon Downs and Devoran 3.0 mi | 19.9°C about the same | 4.2°C about the same | 1,193 mm |
| Perranarworthal 3.5 mi | 19.9°C about the same | 4.1°C about the same | 1,199 mm |
| St Day 3.6 mi | 19.2°C about the same | 3.8°C about the same | 1,268 mm |
| Carharrack 3.7 mi | 19.2°C about the same | 3.8°C about the same | 1,268 mm |
Threemilestone 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 | 9.1°C 48°F | 3.9°C 39°F | 6.5°C | 133 mm 5.2 in |
| February | 9.3°C 49°F | 3.6°C 38°F | 6.4°C | 108 mm 4.2 in |
| March | 10.6°C 51°F | 4.6°C 40°F | 7.6°C | 84 mm 3.3 in |
| April | 12.7°C 55°F | 5.6°C 42°F | 9.1°C | 76 mm 3.0 in |
| May | 15.2°C 59°F | 7.9°C 46°F | 11.6°C | 63 mm 2.5 in |
| June | 17.8°C 64°F | 10.6°C 51°F | 14.3°C | 65 mm 2.6 in |
| July | 19.5°C 67°F | 12.6°C 55°F | 16.1°C | 71 mm 2.8 in |
| August | 19.4°C 67°F | 12.7°C 55°F | 16.1°C | 84 mm 3.3 in |
| September | 17.6°C 64°F | 11.0°C 52°F | 14.4°C | 83 mm 3.3 in |
| October | 14.7°C 58°F | 8.9°C 48°F | 11.8°C | 121 mm 4.8 in |
| November | 11.6°C 53°F | 6.1°C 43°F | 8.9°C | 151 mm 5.9 in |
| December | 9.7°C 49°F | 4.5°C 40°F | 7.1°C | 155 mm 6.1 in |
| Year | 13.9°C | 7.7°C | 10.8°C | 1,192 mm |
Where Threemilestone’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 Threemilestone’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, 9.9 miles away, months of 1991–2020 averaged.
- Comparisons: every town and city of 2,500 or more in England and Wales, read the same way.
Met Office HadUK-Grid · Met Office Climate Data Portal · Historic station data. Open Government Licence v3.0.
Questions about Threemilestone’s climate
How warm does Threemilestone get in summer?
July is the warmest month, with average highs of 19.5°C (67°F). About 3 days a year reach 25°C (77°F), fewer than 96% of UK towns.
How cold does Threemilestone get in winter?
February nights average 3.6°C (38°F). The air drops below freezing on about 18 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Threemilestone get?
About 1,192 mm (47 in) a year, more than 92% of UK towns. December is the wettest month (155 mm) and May the driest (63 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Camborne (9.9 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 Threemilestone. 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 Threemilestone →
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.