Few mainland French towns get fewer days of 25 degrees or more than Saint-Donan
In January the night’s low is typically 3.8°C. Winter and summer sit 18°C apart. Frost is rarer than in 93% of mainland French towns: about 17 nights a year drop below freezing. Homes need heating from November to April, the months averaging under 10°C.
These are the figures of Météo-France’s Saint-Brieuc station, 7.7 km north.
A year in Saint-Donan at a glance
Each month’s typical high and low in °C, at the Saint-Brieuc station.
What a year in Saint-Donan feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Saint-Brieuc.
About 757 mm of rain a year
December is the wettest month and July the driest. About 20 days a year bring 10 mm or more. 41st wettest of 61 towns of 2,500+ in Côtes-d'Armor.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Saint-Brieuc
17 frosts and 11 days of 25°C a year
On about 17 nights a year the air drops to 0°C or below, and on about under 1 days it stays below freezing all day. About 11 days a year reach 25°C, and 1 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Saint-Brieuc: 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 Saint-Brieuc
Saint-Brieuc is 7.7 km north of Saint-Donan. Every figure on this page is the station’s, not a measurement in Saint-Donan itself.
| Station (Météo-France number) | Saint-Brieuc (22372001) |
| Distance from the town | 7.7 km north |
| Station altitude | 135 m |
| Town altitude (its center) | 178 m |
| Period | 1991–2020 |
| Sunshine measured at | the same station |
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 Saint-Donan 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 |
|---|---|---|---|---|
| Saint-Donan | Saint-Brieuc | 21.4°C | 3.8°C | 757 mm |
| Ploufragan 6.9 km | same station | 21.4°C about the same | 3.8°C about the same | 757 mm |
| Quintin 7.7 km | Plœuc-sur-Lie | 22.6°C 1.2°C warmer | 2.6°C 1.2°C colder | 955 mm |
| Plaintel 8.1 km | Plœuc-sur-Lie | 22.6°C 1.2°C warmer | 2.6°C 1.2°C colder | 955 mm |
| Plélo 9.9 km | same station | 21.4°C about the same | 3.8°C about the same | 757 mm |
| Saint-Brieuc 10 km | same station | 21.4°C about the same | 3.8°C about the same | 757 mm |
| Châtelaudren-Plouagat 10 km | same station | 21.4°C about the same | 3.8°C about the same | 757 mm |
Saint-Donan weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Saint-Brieuc station.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 8.9°C | 3.8°C | 6.3°C | 74 mm | 65 |
| February | 9.4°C | 3.6°C | 6.5°C | 65 mm | 83 |
| March | 11.4°C | 4.7°C | 8.0°C | 53 mm | 122 |
| April | 13.6°C | 6.0°C | 9.8°C | 60 mm | 163 |
| May | 16.4°C | 8.6°C | 12.5°C | 56 mm | 188 |
| June | 19.3°C | 11.2°C | 15.3°C | 51 mm | 196 |
| July | 21.4°C | 13.0°C | 17.2°C | 42 mm | 198 |
| August | 21.6°C | 13.2°C | 17.4°C | 45 mm | 182 |
| September | 19.5°C | 11.5°C | 15.5°C | 52 mm | 164 |
| October | 15.8°C | 9.4°C | 12.6°C | 82 mm | 110 |
| November | 12.0°C | 6.5°C | 9.2°C | 88 mm | 79 |
| December | 9.5°C | 4.3°C | 6.9°C | 91 mm | 66 |
| Year | 14.9°C | 8.0°C | 11.4°C | 757 mm | 1,616 |
Where Saint-Donan’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Saint-Brieuc, 7.7 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, 7.7 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 Saint-Donan’s climate
How warm does Saint-Donan get in summer?
August is the warmest month, with average highs of 21.6°C. About 11 days a year reach 25°C, fewer than almost every mainland French town, and about 1 reach 30°C.
How cold does Saint-Donan get in winter?
February nights average 3.6°C. The air drops to 0°C or below on about 17 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Saint-Donan get?
About 757 mm a year, more than 51% of mainland French towns. December is the wettest month (91 mm) and July the driest (42 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Saint-Brieuc (7.7 km away), averages 1,616 hours of sunshine a year.
Are these figures for Saint-Donan itself?
No: they are the normals of the Météo-France station matched to Saint-Donan, Saint-Brieuc, 7.7 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 ST BRIEUC, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Saint-Donan →
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.