Few mainland French towns get fewer days of 25 degrees or more than Cavan
In January the night’s low is typically 4.4°C. Wet weather is most frequent in December and least in September. Winters are mild: January nights here are milder than in 95% of mainland French towns. Keep the boiler serviced for the months from November to April, which average under 10°C.
These are the figures of Météo-France’s Lannion station, 12 km north-west.
A year in Cavan at a glance
Each month’s typical high and low in °C, at the Lannion station.
What a year in Cavan feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Lannion.
About 930 mm of rain a year
December is the wettest month and September the driest. About 26 days a year bring 10 mm or more. 6th wettest of 61 towns of 2,500+ in Côtes-d'Armor.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Saint-Brieuc
16 frosts and 9 days of 25°C a year
On about 16 nights a year the air drops to 0°C or below; days that stay below freezing are rare. About 9 days a year reach 25°C, and under 1 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Lannion: 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 Lannion
Lannion is 12 km north-west of Cavan. Every figure on this page is the station’s, not a measurement in Cavan itself.
| Station (Météo-France number) | Lannion (22113006) |
| Distance from the town | 12 km north-west |
| Station altitude | 85 m |
| Town altitude (its center) | 96 m |
| Period | 1993–2020 (the station’s own record) |
| Nearest station of any kind | 10 km |
| Sunshine measured at | Saint-Brieuc, 40 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 Cavan 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 |
|---|---|---|---|---|
| Cavan | Lannion | 20.6°C | 4.4°C | 930 mm |
| Bégard 6.4 km | Pommerit-Jaudy | 21.8°C 1.2°C warmer | 4.5°C about the same | 887 mm |
| Ploubezre 8 km | same station | 20.6°C about the same | 4.4°C about the same | 930 mm |
| La Roche-Jaudy 11 km | Pommerit-Jaudy | 21.8°C 1.2°C warmer | 4.5°C about the same | 887 mm |
| Lannion 11 km | same station | 20.6°C about the same | 4.4°C about the same | 930 mm |
| Louannec 14 km | Ploumanac'H | 20.1°C 0.5°C cooler | 5.7°C 1.3°C milder | 855 mm |
| Penvénan 16 km | Pommerit-Jaudy | 21.8°C 1.2°C warmer | 4.5°C about the same | 887 mm |
Cavan weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Lannion station; sunshine at Saint-Brieuc.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 9.5°C | 4.4°C | 6.9°C | 96 mm | 65 |
| February | 10.0°C | 4.2°C | 7.1°C | 92 mm | 83 |
| March | 11.6°C | 4.9°C | 8.3°C | 66 mm | 122 |
| April | 13.6°C | 6.0°C | 9.8°C | 70 mm | 163 |
| May | 16.3°C | 8.7°C | 12.5°C | 63 mm | 188 |
| June | 18.8°C | 11.4°C | 15.1°C | 55 mm | 196 |
| July | 20.6°C | 13.1°C | 16.9°C | 53 mm | 198 |
| August | 20.9°C | 13.3°C | 17.1°C | 55 mm | 182 |
| September | 19.4°C | 11.6°C | 15.5°C | 53 mm | 164 |
| October | 16.3°C | 9.7°C | 13.0°C | 100 mm | 110 |
| November | 12.4°C | 6.8°C | 9.6°C | 105 mm | 79 |
| December | 10.2°C | 5.0°C | 7.6°C | 123 mm | 66 |
| Year | 15.0°C | 8.3°C | 11.6°C | 930 mm | 1,616 |
Where Cavan’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Lannion, 12 km away: statistics for 1991–2020 (the station’s own years, 1993–2020, where its record is shorter).
- 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, 40 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 Cavan’s climate
How warm does Cavan get in summer?
August is the warmest month, with average highs of 20.9°C. About 9 days a year reach 25°C, fewer than almost every mainland French town, and about under 1 reach 30°C.
How cold does Cavan get in winter?
February nights average 4.2°C. The air drops to 0°C or below on about 16 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Cavan get?
About 930 mm a year, more than 82% of mainland French towns. December is the wettest month (123 mm) and September the driest (53 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Saint-Brieuc (40 km away), averages 1,616 hours of sunshine a year.
Are these figures for Cavan itself?
No: they are the normals of the Météo-France station matched to Cavan, Lannion, 12 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 LANNION_AERO, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Cavan →
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.