Plussulien has some of the coolest summers among mainland French towns
The coldest hours of a January night bottom out at 3.1°C on average. Of the 61 towns of 2,500+ in Côtes-d'Armor, it is the wettest. Rain peaks in December and eases off in June. Homes need heating from November to April, the months averaging under 10°C.
Figures from Météo-France’s Rostrenen station, 18 km west.
A year in Plussulien at a glance
Each month’s typical high and low in °C, at the Rostrenen station.
What a year in Plussulien feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Rostrenen.
About 1,147 mm of rain a year
December is the wettest month and June the driest. About 36 days a year bring 10 mm or more. The wettest of 61 towns of 2,500+ in Côtes-d'Armor.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Saint-Brieuc
22 frosts and 19 days of 25°C a year
On about 22 nights a year the air drops to 0°C or below, and on about 1 days it stays below freezing all day. About 19 days a year reach 25°C, and 2 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Rostrenen: 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 Rostrenen
Rostrenen is 18 km west of Plussulien. Every figure on this page is the station’s, not a measurement in Plussulien itself.
| Station (Météo-France number) | Rostrenen (22266001) |
| Distance from the town | 18 km west |
| Station altitude | 236 m |
| Town altitude (its center) | 206 m |
| Period | 1991–2020 |
| Nearest station of any kind | 15 km |
| Sunshine measured at | Saint-Brieuc, 33 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 Plussulien 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 |
|---|---|---|---|---|
| Plussulien | Rostrenen | 21.7°C | 3.1°C | 1,147 mm |
| Guerlédan 11 km | Loudéac | 23.0°C 1.3°C warmer | 2.8°C about the same | 923 mm |
| Cléguérec 18 km | Loudéac | 23.0°C 1.3°C warmer | 2.8°C about the same | 923 mm |
| Quintin 18 km | Plœuc-sur-Lie | 22.6°C 0.9°C warmer | 2.6°C 0.5°C colder | 955 mm |
| Rostrenen 19 km | same station | 21.7°C about the same | 3.1°C about the same | 1,147 mm |
| Plœuc-L'Hermitage 23 km | Plœuc-sur-Lie | 22.6°C 0.9°C warmer | 2.6°C 0.5°C colder | 955 mm |
| Plaintel 24 km | Plœuc-sur-Lie | 22.6°C 0.9°C warmer | 2.6°C 0.5°C colder | 955 mm |
Plussulien weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Rostrenen station; sunshine at Saint-Brieuc.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 8.0°C | 3.1°C | 5.6°C | 135 mm | 65 |
| February | 8.8°C | 2.9°C | 5.8°C | 109 mm | 83 |
| March | 11.3°C | 4.2°C | 7.8°C | 83 mm | 122 |
| April | 13.9°C | 5.5°C | 9.7°C | 81 mm | 163 |
| May | 16.9°C | 8.2°C | 12.6°C | 76 mm | 188 |
| June | 19.8°C | 10.7°C | 15.3°C | 57 mm | 196 |
| July | 21.7°C | 12.5°C | 17.1°C | 67 mm | 198 |
| August | 21.9°C | 12.7°C | 17.3°C | 68 mm | 182 |
| September | 19.4°C | 10.9°C | 15.2°C | 76 mm | 164 |
| October | 15.2°C | 8.7°C | 12.0°C | 120 mm | 110 |
| November | 11.2°C | 5.8°C | 8.5°C | 128 mm | 79 |
| December | 8.6°C | 3.7°C | 6.1°C | 146 mm | 66 |
| Year | 14.7°C | 7.4°C | 11.1°C | 1,147 mm | 1,616 |
Where Plussulien’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Rostrenen, 18 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, 33 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 Plussulien’s climate
How warm does Plussulien get in summer?
August is the warmest month, with average highs of 21.9°C. About 19 days a year reach 25°C, fewer than 96% of mainland French towns, and about 2 reach 30°C.
How cold does Plussulien get in winter?
February nights average 2.9°C. The air drops to 0°C or below on about 22 nights a year, and about 1 days a year stay below freezing all day.
How much rain does Plussulien get?
About 1,147 mm a year, more than 93% of mainland French towns. December is the wettest month (146 mm) and June the driest (57 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Saint-Brieuc (33 km away), averages 1,616 hours of sunshine a year.
Are these figures for Plussulien itself?
No: they are the normals of the Météo-France station matched to Plussulien, Rostrenen, 18 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 ROSTRENEN, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Plussulien →
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.