Photo: Liberliger · CC BY-SA 4.0January in Crossac stays gentler than in 88% of mainland French towns
Expect July afternoons of about 24.4°C. Warm afternoons come less often than in 81% of mainland French towns. The rainiest month is December; the driest is July. Keep the boiler serviced for the months from November to March, which average under 10°C.
Figures from Météo-France’s Saint-Nazaire-Montoir station, 10 km south.
A year in Crossac at a glance
Each month’s typical high and low in °C, at the Saint-Nazaire-Montoir station.
What a year in Crossac feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Saint-Nazaire-Montoir.
About 792 mm of rain a year
December is the wettest month and July the driest. About 24 days a year bring 10 mm or more. 62nd wettest of 133 towns of 2,500+ in Loire-Atlantique.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Saint-Nazaire-Montoir
27 frosts and 40 days of 25°C a year
On about 27 nights a year the air drops to 0°C or below, and on about under 1 days it stays below freezing all day. About 40 days a year reach 25°C, and 9 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Saint-Nazaire-Montoir: 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-Nazaire-Montoir
Saint-Nazaire-Montoir is 10 km south of Crossac. Every figure on this page is the station’s, not a measurement in Crossac itself.
| Station (Météo-France number) | Saint-Nazaire-Montoir (44103001) |
| Distance from the town | 10 km south |
| Station altitude | 3 m |
| Town altitude (its center) | 3 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 Crossac 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 Loire-Atlantique.
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 |
|---|---|---|---|---|
| Crossac | Saint-Nazaire-Montoir | 24.4°C | 3.7°C | 792 mm |
| Saint-Joachim 4.7 km | same station | 24.4°C about the same | 3.7°C about the same | 792 mm |
| Pontchâteau 5.3 km | same station | 24.4°C about the same | 3.7°C about the same | 792 mm |
| Besné 6 km | same station | 24.4°C about the same | 3.7°C about the same | 792 mm |
| Saint-Malo-de-Guersac 6.4 km | same station | 24.4°C about the same | 3.7°C about the same | 792 mm |
| La Chapelle-des-Marais 7.9 km | Herbignac | 24.6°C about the same | 3.6°C about the same | 886 mm |
| Missillac 8.2 km | Herbignac | 24.6°C about the same | 3.6°C about the same | 886 mm |
Crossac weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Saint-Nazaire-Montoir station.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 9.5°C | 3.7°C | 6.6°C | 88 mm | 73 |
| February | 10.4°C | 3.4°C | 6.9°C | 68 mm | 102 |
| March | 13.2°C | 5.1°C | 9.1°C | 59 mm | 149 |
| April | 15.8°C | 6.6°C | 11.2°C | 57 mm | 175 |
| May | 19.2°C | 9.8°C | 14.5°C | 55 mm | 207 |
| June | 22.5°C | 12.5°C | 17.5°C | 40 mm | 233 |
| July | 24.4°C | 14.1°C | 19.3°C | 39 mm | 233 |
| August | 24.5°C | 13.9°C | 19.2°C | 44 mm | 234 |
| September | 21.9°C | 11.4°C | 16.7°C | 63 mm | 198 |
| October | 17.4°C | 9.5°C | 13.5°C | 88 mm | 128 |
| November | 13.1°C | 6.1°C | 9.6°C | 95 mm | 90 |
| December | 10.2°C | 4.0°C | 7.1°C | 97 mm | 72 |
| Year | 16.8°C | 8.3°C | 12.6°C | 792 mm | 1,893 |
Where Crossac’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Saint-Nazaire-Montoir, 10 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-Nazaire-Montoir, 10 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 Loire-Atlantique.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Crossac’s climate
How warm does Crossac get in summer?
August is the warmest month, with average highs of 24.5°C. About 40 days a year reach 25°C, fewer than 81% of mainland French towns, and about 9 reach 30°C.
How cold does Crossac get in winter?
February nights average 3.4°C. The air drops to 0°C or below on about 27 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Crossac get?
About 792 mm a year, more than 59% of mainland French towns. December is the wettest month (97 mm) and July the driest (39 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Saint-Nazaire-Montoir (10 km away), averages 1,893 hours of sunshine a year.
Are these figures for Crossac itself?
No: they are the normals of the Météo-France station matched to Crossac, Saint-Nazaire-Montoir, 10 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 NAZAIRE-MONTOIR, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Crossac →
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.