Few mainland French towns get fewer days of 25 degrees or more than Trélévern
January mornings start at about 5.7°C. Seasons differ by 15°C, from the coldest nights to the warmest afternoons. By frosts alone, it ranks gentler than 98% of mainland French towns. The outdoor season runs from June to September, with highs of 18–21°C.
These are the figures of Météo-France’s Ploumanac'H station, 7.5 km west.
A year in Trélévern at a glance
Each month’s typical high and low in °C, at the Ploumanac'H station.
What a year in Trélévern feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Ploumanac'H.
About 855 mm of rain a year
December is the wettest month and July the driest. About 23 days a year bring 10 mm or more. 17th wettest of 61 towns of 2,500+ in Côtes-d'Armor.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Saint-Brieuc
4 frosts and 4 days of 25°C a year
On about 4 nights a year the air drops to 0°C or below; days that stay below freezing are rare. About 4 days a year reach 25°C, and under 1 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Ploumanac'H: a frost is a night of 0°C or below, a summer day (jour d’été) 25°C or more, a hot day (forte chaleur) 30°C or more.
The Météo-France station at Ploumanac'H
Ploumanac'H is 7.5 km west of Trélévern. Every figure on this page is the station’s, not a measurement in Trélévern itself.
| Station (Météo-France number) | Ploumanac'H (22168001) |
| Distance from the town | 7.5 km west |
| Station altitude | 55 m |
| Town altitude (its center) | 69 m |
| Period | 1991–2020 |
| Sunshine measured at | Saint-Brieuc, 49 km away |
TownRatings matches each commune to one station with at least 24 years of temperature and rain records: the nearest, counting every 100 m of height difference as 10 km, never across the sea.
How Trélévern compares
Against the 4,385 towns of 2,500 or more in mainland France, each read from its own matched station. The dots are the other towns of 2,500+ in Côtes-d'Armor.
Nearby towns’ climate
The nearest towns of 2,500+ within 29 km. Where a neighbor uses the same station its figures are the same: the differences you’d feel over a few kilometers aren’t in the normals.
| Town | Station | July high | January low | Rain a year |
|---|---|---|---|---|
| Trélévern | Ploumanac'H | 20.1°C | 5.7°C | 855 mm |
| Louannec 3.4 km | same station | 20.1°C about the same | 5.7°C about the same | 855 mm |
| Penvénan 5.6 km | Pommerit-Jaudy | 21.8°C 1.7°C warmer | 4.5°C 1.2°C colder | 887 mm |
| Perros-Guirec 6.2 km | same station | 20.1°C about the same | 5.7°C about the same | 855 mm |
| Trégastel 9.9 km | same station | 20.1°C about the same | 5.7°C about the same | 855 mm |
| Lannion 10 km | Lannion | 20.6°C 0.5°C warmer | 4.4°C 1.3°C colder | 930 mm |
| Pleumeur-Bodou 11 km | same station | 20.1°C about the same | 5.7°C about the same | 855 mm |
Trélévern weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Ploumanac'H station; sunshine at Saint-Brieuc.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 9.9°C | 5.7°C | 7.8°C | 89 mm | 65 |
| February | 10.2°C | 5.4°C | 7.8°C | 79 mm | 83 |
| March | 11.7°C | 6.5°C | 9.1°C | 59 mm | 122 |
| April | 13.3°C | 7.6°C | 10.5°C | 65 mm | 163 |
| May | 15.7°C | 9.9°C | 12.8°C | 58 mm | 188 |
| June | 18.2°C | 12.3°C | 15.2°C | 50 mm | 196 |
| July | 20.1°C | 14.1°C | 17.1°C | 47 mm | 198 |
| August | 20.6°C | 14.5°C | 17.6°C | 54 mm | 182 |
| September | 19.2°C | 13.4°C | 16.3°C | 53 mm | 164 |
| October | 16.3°C | 11.2°C | 13.7°C | 94 mm | 110 |
| November | 12.8°C | 8.4°C | 10.6°C | 98 mm | 79 |
| December | 10.6°C | 6.3°C | 8.5°C | 110 mm | 66 |
| Year | 14.9°C | 9.6°C | 12.3°C | 855 mm | 1,616 |
Where Trélévern’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Ploumanac'H, 7.5 km away: statistics for 1991–2020.
- Which station: among stations with at least 24 of the 30 years of temperature and rain, the nearest to the commune’s population-weighted center, counting each 100 m of height difference as 10 km; mainland towns use mainland stations and each overseas département its own.
- Altitudes: the town’s from IGN’s RGE ALTI® at its population-weighted center; the station’s from Météo-France.
- Sunshine: the nearest station with at least 10 years of sunshine records, Saint-Brieuc, 49 km away.
- Comparisons: every town of 2,500 or more in mainland France, read the same way; the dots are the towns of 2,500+ in Côtes-d'Armor.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Trélévern’s climate
How warm does Trélévern get in summer?
August is the warmest month, with average highs of 20.6°C. About 4 days a year reach 25°C, fewer than almost every mainland French town, and about under 1 reach 30°C.
How cold does Trélévern get in winter?
February nights average 5.4°C. The air drops to 0°C or below on about 4 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Trélévern get?
About 855 mm a year, more than 71% of mainland French towns. December is the wettest month (110 mm) and July the driest (47 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Saint-Brieuc (49 km away), averages 1,616 hours of sunshine a year.
Are these figures for Trélévern itself?
No: they are the normals of the Météo-France station matched to Trélévern, Ploumanac'H, 7.5 km away. France publishes its climate normals by station, not by commune; a valley, a hill or the sea can make a difference over a few kilometers.
Where do these figures come from?
Météo-France’s fiches climatologiques: 30-year averages (1991–2020) for each of its long-running stations, published as open data since 2024. They are normals, not a forecast.
Source: Météo-France, fiches climatologiques, 1991–2020 statistics (station PLOUMANAC'H, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Trélévern →
Contains public sector information under the Licence Ouverte / Open Licence 2.0 (Etalab): INSEE, DGFiP, the Interior Ministry’s statistics service (SSMSI), the Ministry of Education (DEPP), the Health Ministry’s statistics service (DREES) and the Housing Ministry (Carte des loyers). Commune boundaries: IGN Admin Express.