Dry weather: only 616 mm a year falls on Ermont, less than on 93% of mainland French towns
In January the night’s low is typically 2.3°C. Only 23°C separates winter nights from summer afternoons. By warm days alone, it ranks cooler than 67% of mainland French towns. Windscreens need scraping on about 37 mornings a year, the nights the air drops below 0°C.
Figures from Météo-France’s Le Bourget station, 13 km east.
A year in Ermont at a glance
Each month’s typical high and low in °C, at the Le Bourget station.
What a year in Ermont feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Le Bourget.
About 616 mm of rain a year
December is the wettest month and February the driest. About 16 days a year bring 10 mm or more. 51st wettest of 76 towns of 2,500+ in Val-d'Oise.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Le Bourget
37 frosts and 51 days of 25°C a year
On about 37 nights a year the air drops to 0°C or below, and on about 3 days it stays below freezing all day. About 51 days a year reach 25°C, and 13 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Le Bourget: 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 Le Bourget
Le Bourget is 13 km east of Ermont. Every figure on this page is the station’s, not a measurement in Ermont itself.
| Station (Météo-France number) | Le Bourget (95088001) |
| Distance from the town | 13 km east |
| Station altitude | 49 m |
| Town altitude (its center) | 54 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 Ermont 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 Val-d'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 |
|---|---|---|---|---|
| Ermont | Le Bourget | 25.5°C | 2.3°C | 616 mm |
| Eaubonne 1.6 km | same station | 25.5°C about the same | 2.3°C about the same | 616 mm |
| Le Plessis-Bouchard 1.8 km | Pontoise -Ville | 26.1°C 0.6°C warmer | 2.7°C about the same | 667 mm |
| Sannois 1.8 km | same station | 25.5°C about the same | 2.3°C about the same | 616 mm |
| Franconville 2 km | Pontoise -Ville | 26.1°C 0.6°C warmer | 2.7°C about the same | 667 mm |
| Saint-Prix 2.1 km | same station | 25.5°C about the same | 2.3°C about the same | 616 mm |
| Margency 2.6 km | same station | 25.5°C about the same | 2.3°C about the same | 616 mm |
Ermont weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Le Bourget station.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 7.5°C | 2.3°C | 4.9°C | 47 mm | 57 |
| February | 8.7°C | 2.1°C | 5.4°C | 41 mm | 74 |
| March | 12.6°C | 4.2°C | 8.4°C | 44 mm | 129 |
| April | 16.1°C | 6.3°C | 11.2°C | 43 mm | 171 |
| May | 19.6°C | 9.8°C | 14.7°C | 61 mm | 189 |
| June | 23.0°C | 13.0°C | 18.0°C | 54 mm | 203 |
| July | 25.5°C | 14.9°C | 20.2°C | 56 mm | 213 |
| August | 25.4°C | 14.6°C | 20.0°C | 53 mm | 206 |
| September | 21.5°C | 11.5°C | 16.5°C | 45 mm | 162 |
| October | 16.5°C | 8.8°C | 12.7°C | 57 mm | 111 |
| November | 11.1°C | 5.2°C | 8.1°C | 54 mm | 64 |
| December | 7.9°C | 2.8°C | 5.4°C | 63 mm | 54 |
| Year | 16.3°C | 8.0°C | 12.1°C | 616 mm | 1,634 |
Where Ermont’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Le Bourget, 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, Le Bourget, 13 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 Val-d'Oise.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Ermont’s climate
How warm does Ermont get in summer?
July is the warmest month, with average highs of 25.5°C. About 51 days a year reach 25°C, fewer than 67% of mainland French towns, and about 13 reach 30°C.
How cold does Ermont get in winter?
February nights average 2.1°C. The air drops to 0°C or below on about 37 nights a year, and about 3 days a year stay below freezing all day.
How much rain does Ermont get?
About 616 mm a year, less than 93% of mainland French towns. December is the wettest month (63 mm) and February the driest (41 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Le Bourget (13 km away), averages 1,634 hours of sunshine a year.
Are these figures for Ermont itself?
No: they are the normals of the Météo-France station matched to Ermont, Le Bourget, 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 LE BOURGET, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Ermont →
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.