January in Saint-Barthélemy bites harder than in 76% of mainland French towns
In July the day’s top temperature is typically 25.4°C. Seasons differ by 25°C, from the coldest nights to the warmest afternoons. Days of 25°C are scarce: about 49 a year, fewer than in 70% of mainland French towns. An umbrella earns its place on about 119 days a year with 1 mm of rain or more.
These are the figures of Météo-France’s Esternay station, 18 km south-east.
A year in Saint-Barthélemy at a glance
Each month’s typical high and low in °C, at the Esternay station.
What a year in Saint-Barthélemy feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Esternay.
About 701 mm of rain a year
December is the wettest month and April the driest. About 18 days a year bring 10 mm or more. 65th wettest of 116 towns of 2,500+ in Seine-et-Marne.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Melun
A frosty town: 53 frosts and 49 days of 25°C a year
On about 53 nights a year the air drops to 0°C or below, and on about 6 days it stays below freezing all day. About 49 days a year reach 25°C, and 12 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Esternay: 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 Esternay
Esternay is 18 km south-east of Saint-Barthélemy. Every figure on this page is the station’s, not a measurement in Saint-Barthélemy itself.
| Station (Météo-France number) | Esternay (51237002) |
| Distance from the town | 18 km south-east |
| Station altitude | 185 m |
| Town altitude (its center) | 188 m |
| Period | 1994–2020 (the station’s own record) |
| Nearest station of any kind | 15 km |
| Sunshine measured at | Melun, 55 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 Saint-Barthélemy 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 Seine-et-Marne.
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-Barthélemy | Esternay | 25.4°C | 0.9°C | 701 mm |
| La Ferté-Gaucher 5.7 km | Chevru | 25.3°C about the same | 1.3°C about the same | 698 mm |
| Montmirail 15 km | same station | 25.4°C about the same | 0.9°C about the same | 701 mm |
| Boissy-le-Châtel 16 km | Mouroux | 25.0°C about the same | 1.3°C about the same | 721 mm |
| Charly-sur-Marne 19 km | Saint-Cyr/Morin-Bg | 25.5°C about the same | 1.0°C about the same | 815 mm |
| Coulommiers 20 km | Mouroux | 25.0°C about the same | 1.3°C about the same | 721 mm |
| Jouarre 21 km | Mouroux | 25.0°C about the same | 1.3°C about the same | 721 mm |
Saint-Barthélemy weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Esternay station; sunshine at Melun.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 5.9°C | 0.9°C | 3.4°C | 59 mm | 60 |
| February | 7.5°C | 1.1°C | 4.3°C | 55 mm | 83 |
| March | 11.4°C | 2.7°C | 7.1°C | 49 mm | 143 |
| April | 15.5°C | 4.8°C | 10.1°C | 47 mm | 188 |
| May | 19.0°C | 8.2°C | 13.6°C | 70 mm | 216 |
| June | 22.8°C | 11.2°C | 17.0°C | 54 mm | 226 |
| July | 25.4°C | 13.1°C | 19.3°C | 59 mm | 235 |
| August | 25.1°C | 13.1°C | 19.1°C | 52 mm | 225 |
| September | 20.9°C | 10.1°C | 15.5°C | 51 mm | 180 |
| October | 15.9°C | 7.8°C | 11.9°C | 69 mm | 119 |
| November | 9.9°C | 4.2°C | 7.1°C | 61 mm | 68 |
| December | 6.6°C | 1.7°C | 4.1°C | 75 mm | 54 |
| Year | 15.5°C | 6.6°C | 11.0°C | 701 mm | 1,798 |
Where Saint-Barthélemy’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Esternay, 18 km away: statistics for 1991–2020 (the station’s own years, 1994–2020, 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, Melun, 55 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 Seine-et-Marne.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Saint-Barthélemy’s climate
How warm does Saint-Barthélemy get in summer?
July is the warmest month, with average highs of 25.4°C. About 49 days a year reach 25°C, fewer than 70% of mainland French towns, and about 12 reach 30°C.
How cold does Saint-Barthélemy get in winter?
January nights average 0.9°C. The air drops to 0°C or below on about 53 nights a year, and about 6 days a year stay below freezing all day.
How much rain does Saint-Barthélemy get?
About 701 mm a year, less than 67% of mainland French towns. December is the wettest month (75 mm) and April the driest (47 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Melun (55 km away), averages 1,798 hours of sunshine a year.
Are these figures for Saint-Barthélemy itself?
No: they are the normals of the Météo-France station matched to Saint-Barthélemy, Esternay, 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 ESTERNAY, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Saint-Barthélemy →
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.