Nights turn raw in Source-Seine each January, colder than in 92% of mainland French towns
The warmest part of a July day comes in at 23.9°C on average. Rain is spread evenly through the year: the wettest month, November, gets little more than the driest, March. In July, afternoons here are cooler than in 84% of mainland French towns. Plan for rain on about 134 days a year, the days with 1 mm or more.
These are the figures of Météo-France’s Saint-Martin-du-M station, 12 km south-east.
A year in Source-Seine at a glance
Each month’s typical high and low in °C, at the Saint-Martin-du-M station.
What a year in Source-Seine feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Saint-Martin-du-M.
About 938 mm of rain a year
November is the wettest month and March the driest. About 29 days a year bring 10 mm or more. The wettest of 21 towns of 2,500+ in Côte-d'Or.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Dijon-Longvic
A frosty town: 68 frosts and 37 days of 25°C a year
On about 68 nights a year the air drops to 0°C or below, and on about 18 days it stays below freezing all day. About 37 days a year reach 25°C, and 8 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Saint-Martin-du-M: 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-Martin-du-M
Saint-Martin-du-M is 12 km south-east of Source-Seine. Every figure on this page is the station’s, not a measurement in Source-Seine itself.
| Station (Météo-France number) | Saint-Martin-du-M (21561003) |
| Distance from the town | 12 km south-east |
| Station altitude | 578 m |
| Town altitude (its center) | 476 m |
| Period | 1992–2020 (the station’s own record) |
| Sunshine measured at | Dijon-Longvic, 39 km away |
Source-Seine sits 102 m lower than the station. Air usually warms by about 0.65°C every 100 m you go down, so expect Source-Seine to run about 0.7°C warmer than these figures.
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 Source-Seine 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 Côte-d'Or.
Nearby towns’ climate
The nearest towns of 2,500+ within 29 km, each with its own matched station.
| Town | Station | July high | January low | Rain a year |
|---|---|---|---|---|
| Source-Seine | Saint-Martin-du-M | 23.9°C | −0.7°C | 938 mm |
| Venarey-les-Laumes 19 km | Montbard | 26.3°C 2.4°C warmer | 0.5°C 1.2°C milder | 854 mm |
| Semur-en-Auxois 27 km | Semur-en-Auxois | 26.0°C 2.1°C warmer | 0.3°C 1°C milder | 778 mm |
| Talant 29 km | Marsannay-la-Côte | 27.1°C 3.2°C warmer | −0.1°C 0.6°C milder | 803 mm |
Source-Seine weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Saint-Martin-du-M station; sunshine at Dijon-Longvic.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 4.2°C | −0.7°C | 1.7°C | 82 mm | 61 |
| February | 5.5°C | −0.5°C | 2.5°C | 66 mm | 95 |
| March | 9.7°C | 1.9°C | 5.8°C | 64 mm | 160 |
| April | 13.5°C | 4.6°C | 9.1°C | 74 mm | 194 |
| May | 17.3°C | 8.1°C | 12.7°C | 89 mm | 216 |
| June | 21.5°C | 11.3°C | 16.4°C | 76 mm | 240 |
| July | 23.9°C | 13.4°C | 18.7°C | 77 mm | 257 |
| August | 23.4°C | 13.7°C | 18.5°C | 71 mm | 240 |
| September | 18.8°C | 10.2°C | 14.5°C | 74 mm | 191 |
| October | 13.9°C | 7.2°C | 10.6°C | 86 mm | 118 |
| November | 8.2°C | 2.7°C | 5.4°C | 92 mm | 67 |
| December | 5.0°C | 0.2°C | 2.6°C | 86 mm | 53 |
| Year | 13.7°C | 6.0°C | 9.9°C | 938 mm | 1,890 |
Where Source-Seine’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Saint-Martin-du-M, 12 km away: statistics for 1991–2020 (the station’s own years, 1992–2020, 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, Dijon-Longvic, 39 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 Côte-d'Or.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Source-Seine’s climate
How warm does Source-Seine get in summer?
July is the warmest month, with average highs of 23.9°C. About 37 days a year reach 25°C, fewer than 84% of mainland French towns, and about 8 reach 30°C.
How cold does Source-Seine get in winter?
January nights average −0.7°C. The air drops to 0°C or below on about 68 nights a year, and about 18 days a year stay below freezing all day.
How much rain does Source-Seine get?
About 938 mm a year, more than 82% of mainland French towns. November is the wettest month (92 mm) and March the driest (64 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Dijon-Longvic (39 km away), averages 1,890 hours of sunshine a year.
Are these figures for Source-Seine itself?
No: they are the normals of the Météo-France station matched to Source-Seine, Saint-Martin-du-M, 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 ST-MARTIN-DU-M, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Source-Seine →
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.