Rainfall in Gressey trails that of 89% of mainland French towns: 633 mm a year
Midwinter brings lows of about 1.7°C. Rain peaks in December and eases off in September. By warm days alone, it ranks cooler than 74% of mainland French towns. Frost greets about 47 mornings a year, so leave time to clear the car.
These are the figures of Météo-France’s Bû station, 9 km south-west.
A year in Gressey at a glance
Each month’s typical high and low in °C, at the Bû station.
What a year in Gressey feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Bû.
About 633 mm of rain a year
December is the wettest month and September the driest. About 16 days a year bring 10 mm or more. 94th wettest of 95 towns of 2,500+ in Yvelines.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Trappes
47 frosts and 46 days of 25°C a year
On about 47 nights a year the air drops to 0°C or below, and on about 4 days it stays below freezing all day. About 46 days a year reach 25°C, and 12 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Bû: 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 Bû
Bû is 9 km south-west of Gressey. Every figure on this page is the station’s, not a measurement in Gressey itself.
| Station (Météo-France number) | Bû (28064002) |
| Distance from the town | 9 km south-west |
| Station altitude | 132 m |
| Town altitude (its center) | 130 m |
| Period | 1996–2020 (the station’s own record) |
| Sunshine measured at | Trappes, 30 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 Gressey 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 Yvelines.
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 |
|---|---|---|---|---|
| Gressey | Bû | 25.1°C | 1.7°C | 633 mm |
| Houdan 4.9 km | same station | 25.1°C about the same | 1.7°C about the same | 633 mm |
| Gambais 7.6 km | same station | 25.1°C about the same | 1.7°C about the same | 633 mm |
| Garancières 11 km | Magnanville | 25.5°C about the same | 1.7°C about the same | 642 mm |
| La Queue-les-Yvelines 12 km | Saint-Léger | 24.8°C about the same | 1.3°C about the same | 706 mm |
| Ivry-la-Bataille 12 km | same station | 25.1°C about the same | 1.7°C about the same | 633 mm |
| Anet 12 km | same station | 25.1°C about the same | 1.7°C about the same | 633 mm |
Gressey weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Bû station; sunshine at Trappes.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.9°C | 1.7°C | 4.3°C | 50 mm | 57 |
| February | 8.4°C | 1.6°C | 5.0°C | 43 mm | 81 |
| March | 12.0°C | 3.2°C | 7.6°C | 47 mm | 134 |
| April | 15.7°C | 4.8°C | 10.2°C | 44 mm | 176 |
| May | 19.1°C | 8.1°C | 13.6°C | 57 mm | 202 |
| June | 22.7°C | 11.2°C | 16.9°C | 57 mm | 210 |
| July | 25.1°C | 13.1°C | 19.1°C | 49 mm | 222 |
| August | 25.1°C | 13.1°C | 19.1°C | 55 mm | 216 |
| September | 21.5°C | 10.4°C | 16.0°C | 40 mm | 177 |
| October | 16.2°C | 8.1°C | 12.1°C | 63 mm | 117 |
| November | 10.6°C | 4.6°C | 7.6°C | 58 mm | 68 |
| December | 7.4°C | 2.2°C | 4.8°C | 69 mm | 55 |
| Year | 15.9°C | 6.8°C | 11.4°C | 633 mm | 1,714 |
Where Gressey’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Bû, 9 km away: statistics for 1991–2020 (the station’s own years, 1996–2020, 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, Trappes, 30 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 Yvelines.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Gressey’s climate
How warm does Gressey get in summer?
July is the warmest month, with average highs of 25.1°C. About 46 days a year reach 25°C, fewer than 74% of mainland French towns, and about 12 reach 30°C.
How cold does Gressey get in winter?
February nights average 1.6°C. The air drops to 0°C or below on about 47 nights a year, and about 4 days a year stay below freezing all day.
How much rain does Gressey get?
About 633 mm a year, less than 89% of mainland French towns. December is the wettest month (69 mm) and September the driest (40 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Trappes (30 km away), averages 1,714 hours of sunshine a year.
Are these figures for Gressey itself?
No: they are the normals of the Météo-France station matched to Gressey, Bû, 9 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 BU_SAPC, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Gressey →
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.