Ice on the ground: Ornex sees more frosts than 94% of mainland French towns
The warmest part of a July day comes in at 27.6°C on average. By rainfall alone, it ranks wetter than 85% of mainland French towns. A year here swings 29°C from midwinter lows to midsummer highs. Plan for rain on about 115 days a year, the days with 1 mm or more.
Figures from Météo-France’s Gaillard station, 14 km south-east.
A year in Ornex at a glance
Each month’s typical high and low in °C, at the Gaillard station.
What a year in Ornex feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Gaillard.
About 967 mm of rain a year
October is the wettest month and February the driest. About 33 days a year bring 10 mm or more. 29th wettest of 60 towns of 2,500+ in Ain.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Meythet
A frosty town: 79 frosts and 78 days of 25°C a year
On about 79 nights a year the air drops to 0°C or below, and on about 7 days it stays below freezing all day. About 78 days a year reach 25°C, and 26 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Gaillard: 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 Gaillard
Gaillard is 14 km south-east of Ornex. Every figure on this page is the station’s, not a measurement in Ornex itself.
| Station (Météo-France number) | Gaillard (74133001) |
| Distance from the town | 14 km south-east |
| Station altitude | 399 m |
| Town altitude (its center) | 478 m |
| Period | 1991–2020 |
| Nearest station of any kind | 3.8 km |
| Sunshine measured at | Meythet, 39 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 Ornex 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 Ain.
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 |
|---|---|---|---|---|
| Ornex | Gaillard | 27.6°C | −1.1°C | 967 mm |
| Prévessin-Moëns 2.5 km | same station | 27.6°C about the same | −1.1°C about the same | 967 mm |
| Ségny 2.6 km | same station | 27.6°C about the same | −1.1°C about the same | 967 mm |
| Ferney-Voltaire 2.7 km | same station | 27.6°C about the same | −1.1°C about the same | 967 mm |
| Cessy 5 km | Archamps | 26.4°C 1.2°C cooler | −1.0°C about the same | 1,170 mm |
| Saint-Genis-Pouilly 5.9 km | same station | 27.6°C about the same | −1.1°C about the same | 967 mm |
| Gex 6.8 km | Saint-Claude | 26.9°C 0.7°C cooler | −2.3°C 1.2°C colder | 1,869 mm |
Ornex weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Gaillard station; sunshine at Meythet.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 5.7°C | −1.1°C | 2.3°C | 63 mm | 88 |
| February | 7.9°C | −1.2°C | 3.3°C | 54 mm | 113 |
| March | 13.0°C | 1.4°C | 7.2°C | 63 mm | 174 |
| April | 17.1°C | 4.5°C | 10.8°C | 76 mm | 191 |
| May | 21.2°C | 8.8°C | 15.0°C | 89 mm | 220 |
| June | 25.2°C | 12.3°C | 18.8°C | 87 mm | 256 |
| July | 27.6°C | 14.1°C | 20.9°C | 83 mm | 274 |
| August | 27.2°C | 13.7°C | 20.5°C | 88 mm | 249 |
| September | 22.1°C | 10.3°C | 16.2°C | 96 mm | 195 |
| October | 16.5°C | 6.9°C | 11.7°C | 98 mm | 141 |
| November | 10.0°C | 2.4°C | 6.2°C | 88 mm | 91 |
| December | 6.1°C | −0.3°C | 2.9°C | 82 mm | 78 |
| Year | 16.6°C | 6.0°C | 11.3°C | 967 mm | 2,069 |
Where Ornex’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Gaillard, 14 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, Meythet, 39 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 Ain.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Ornex’s climate
How warm does Ornex get in summer?
July is the warmest month, with average highs of 27.6°C. About 78 days a year reach 25°C, more than 70% of mainland French towns, and about 26 reach 30°C.
How cold does Ornex get in winter?
February nights average −1.2°C. The air drops to 0°C or below on about 79 nights a year, and about 7 days a year stay below freezing all day.
How much rain does Ornex get?
About 967 mm a year, more than 85% of mainland French towns. October is the wettest month (98 mm) and February the driest (54 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Meythet (39 km away), averages 2,069 hours of sunshine a year.
Are these figures for Ornex itself?
No: they are the normals of the Météo-France station matched to Ornex, Gaillard, 14 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 GAILLARD, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Ornex →
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.