Rainfall in Gannes trails that of 83% of mainland French towns: 648 mm a year
July afternoons average 24.5°C. By warm days alone, it ranks cooler than 81% of mainland French towns. Expect the heaviest rain in December and the lightest in February. Keep the boiler serviced for the months from November to April, which average under 10°C.
These are the figures of Météo-France’s Rouvroy-les-Merles station, 9.7 km north-west.
A year in Gannes at a glance
Each month’s typical high and low in °C, at the Rouvroy-les-Merles station.
What a year in Gannes feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Rouvroy-les-Merles.
About 648 mm of rain a year
December is the wettest month and February the driest. About 16 days a year bring 10 mm or more. 45th wettest of 59 towns of 2,500+ in Oise.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Beauvais-Tillé
A frosty town: 58 frosts and 39 days of 25°C a year
On about 58 nights a year the air drops to 0°C or below, and on about 5 days it stays below freezing all day. About 39 days a year reach 25°C, and 9 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Rouvroy-les-Merles: 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 Rouvroy-les-Merles
Rouvroy-les-Merles is 9.7 km north-west of Gannes. Every figure on this page is the station’s, not a measurement in Gannes itself.
| Station (Météo-France number) | Rouvroy-les-Merles (60555002) |
| Distance from the town | 9.7 km north-west |
| Station altitude | 94 m |
| Town altitude (its center) | 129 m |
| Period | 1991–2020 |
| Sunshine measured at | Beauvais-Tillé, 25 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 Gannes 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 Oise.
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 |
|---|---|---|---|---|
| Gannes | Rouvroy-les-Merles | 24.5°C | 1.2°C | 648 mm |
| Saint-Just-en-Chaussée 7.2 km | Godenvillers | 25.4°C 0.9°C warmer | 1.1°C about the same | 702 mm |
| Breteuil 12 km | same station | 24.5°C about the same | 1.2°C about the same | 648 mm |
| Montdidier 14 km | Godenvillers | 25.4°C 0.9°C warmer | 1.1°C about the same | 702 mm |
| Fitz-James 20 km | Creil | 24.9°C about the same | 1.4°C about the same | 662 mm |
| Agnetz 20 km | Creil | 24.9°C about the same | 1.4°C about the same | 662 mm |
| Ailly-sur-Noye 21 km | same station | 24.5°C about the same | 1.2°C about the same | 648 mm |
Gannes weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Rouvroy-les-Merles station; sunshine at Beauvais-Tillé.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.6°C | 1.2°C | 3.9°C | 52 mm | 60 |
| February | 7.7°C | 1.1°C | 4.4°C | 43 mm | 79 |
| March | 11.5°C | 2.6°C | 7.0°C | 46 mm | 127 |
| April | 15.2°C | 3.9°C | 9.5°C | 43 mm | 179 |
| May | 18.6°C | 7.2°C | 12.9°C | 57 mm | 203 |
| June | 21.9°C | 10.0°C | 16.0°C | 54 mm | 209 |
| July | 24.5°C | 12.0°C | 18.2°C | 60 mm | 220 |
| August | 24.5°C | 12.0°C | 18.2°C | 58 mm | 208 |
| September | 20.6°C | 9.5°C | 15.1°C | 49 mm | 164 |
| October | 15.6°C | 7.3°C | 11.5°C | 58 mm | 112 |
| November | 10.3°C | 4.2°C | 7.2°C | 57 mm | 68 |
| December | 7.0°C | 1.8°C | 4.4°C | 70 mm | 55 |
| Year | 15.3°C | 6.1°C | 10.7°C | 648 mm | 1,682 |
Where Gannes’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Rouvroy-les-Merles, 9.7 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, Beauvais-Tillé, 25 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 Oise.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Gannes’s climate
How warm does Gannes get in summer?
July is the warmest month, with average highs of 24.5°C. About 39 days a year reach 25°C, fewer than 81% of mainland French towns, and about 9 reach 30°C.
How cold does Gannes get in winter?
February nights average 1.1°C. The air drops to 0°C or below on about 58 nights a year, and about 5 days a year stay below freezing all day.
How much rain does Gannes get?
About 648 mm a year, less than 83% of mainland French towns. December is the wettest month (70 mm) and February the driest (43 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Beauvais-Tillé (25 km away), averages 1,682 hours of sunshine a year.
Are these figures for Gannes itself?
No: they are the normals of the Météo-France station matched to Gannes, Rouvroy-les-Merles, 9.7 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 ROUVROY-LES-MERLES, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Gannes →
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.