Hardly any mainland French towns wake to more frost than Isômes
Midsummer highs settle at about 26.8°C. Winter and summer sit 28°C apart. Its yearly rainfall tops that of 81% of mainland French towns. Warm coats and heating bills mark the months from November to March, when means dip under 10°C.
These are the figures of Météo-France’s Coublanc station, 13 km north-east.
A year in Isômes at a glance
Each month’s typical high and low in °C, at the Coublanc station.
What a year in Isômes feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Coublanc.
About 927 mm of rain a year
December is the wettest month and April the driest. About 30 days a year bring 10 mm or more. 4th wettest of 6 towns of 2,500+ in Haute-Marne.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Langres
A frosty town: 82 frosts and 72 days of 25°C a year
On about 82 nights a year the air drops to 0°C or below, and on about 7 days it stays below freezing all day. About 72 days a year reach 25°C, and 24 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Coublanc: 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 Coublanc
Coublanc is 13 km north-east of Isômes. Every figure on this page is the station’s, not a measurement in Isômes itself.
| Station (Météo-France number) | Coublanc (52145001) |
| Distance from the town | 13 km north-east |
| Station altitude | 258 m |
| Town altitude (its center) | 264 m |
| Period | 1991–2020 |
| Sunshine measured at | Langres, 22 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 Isômes 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 Haute-Marne.
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 |
|---|---|---|---|---|
| Isômes | Coublanc | 26.8°C | −0.8°C | 927 mm |
| Is-sur-Tille 20 km | Marsannay-la-Côte | 27.1°C about the same | −0.1°C 0.7°C milder | 803 mm |
| Langres 24 km | Langres | 24.2°C 2.6°C cooler | −0.8°C about the same | 896 mm |
Isômes weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Coublanc station; sunshine at Langres.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 5.7°C | −0.8°C | 2.5°C | 81 mm | 57 |
| February | 7.7°C | −0.8°C | 3.4°C | 66 mm | 87 |
| March | 12.5°C | 1.4°C | 7.0°C | 69 mm | 147 |
| April | 16.8°C | 3.6°C | 10.2°C | 62 mm | 181 |
| May | 20.8°C | 7.8°C | 14.3°C | 86 mm | 199 |
| June | 24.6°C | 11.2°C | 17.9°C | 72 mm | 219 |
| July | 26.8°C | 13.0°C | 19.9°C | 76 mm | 234 |
| August | 26.5°C | 12.8°C | 19.6°C | 77 mm | 223 |
| September | 21.8°C | 9.2°C | 15.5°C | 68 mm | 175 |
| October | 16.2°C | 6.4°C | 11.3°C | 82 mm | 113 |
| November | 9.9°C | 2.6°C | 6.2°C | 92 mm | 62 |
| December | 6.1°C | 0.2°C | 3.2°C | 97 mm | 50 |
| Year | 16.3°C | 5.5°C | 10.9°C | 927 mm | 1,747 |
Where Isômes’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Coublanc, 13 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, Langres, 22 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 Haute-Marne.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Isômes’s climate
How warm does Isômes get in summer?
July is the warmest month, with average highs of 26.8°C. About 72 days a year reach 25°C, more than 66% of mainland French towns, and about 24 reach 30°C.
How cold does Isômes get in winter?
January nights average −0.8°C. The air drops to 0°C or below on about 82 nights a year, and about 7 days a year stay below freezing all day.
How much rain does Isômes get?
About 927 mm a year, more than 81% of mainland French towns. December is the wettest month (97 mm) and April the driest (62 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Langres (22 km away), averages 1,747 hours of sunshine a year.
Are these figures for Isômes itself?
No: they are the normals of the Météo-France station matched to Isômes, Coublanc, 13 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 COUBLANC, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Isômes →
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.