Drom is wetter than 89% of mainland French towns: 1,033 mm of rain a year
Météo-France’s Ceyzériat station, 6.4 km west: a typical year brings 1,033 mm of rain, with July afternoons around 26.6°C and January nights around 0.1°C. Frost is common: about 65 nights a year drop below freezing, more than in 87% of mainland French towns. Summer afternoons here are warmer than in 63% of mainland French towns.
A year in Drom at a glance
Each month’s typical high and low in °C, at the Ceyzériat station.
What a year in Drom feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Ceyzériat.
About 1,033 mm of rain a year
November is the wettest month and February the driest. About 34 days a year bring 10 mm or more. 20th wettest of 60 towns of 2,500+ in Ain.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Amberieu
A frosty town: 65 frosts and 69 days of 25°C a year
On about 65 nights a year the air drops to 0°C or below, and on about 9 days it stays below freezing all day. About 69 days a year reach 25°C, and 20 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Ceyzériat: 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 Ceyzériat
Ceyzériat is 6.4 km west of Drom. Every figure on this page is the station’s, not a measurement in Drom itself.
| Station (Météo-France number) | Ceyzériat (01072001) |
| Distance from the town | 6.4 km west |
| Station altitude | 260 m |
| Town altitude (its center) | 321 m |
| Period | 1994–2020 (the station’s own record) |
| Sunshine measured at | Amberieu, 27 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 Drom 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 |
|---|---|---|---|---|
| Drom | Ceyzériat | 26.6°C | 0.1°C | 1,033 mm |
| Ceyzériat 5.4 km | same station | 26.6°C about the same | 0.1°C about the same | 1,033 mm |
| Saint-Étienne-du-Bois 9.4 km | same station | 26.6°C about the same | 0.1°C about the same | 1,033 mm |
| Bourg-en-Bresse 11 km | same station | 26.6°C about the same | 0.1°C about the same | 1,033 mm |
| Viriat 12 km | same station | 26.6°C about the same | 0.1°C about the same | 1,033 mm |
| Péronnas 13 km | same station | 26.6°C about the same | 0.1°C about the same | 1,033 mm |
| Saint-Denis-lès-Bourg 13 km | same station | 26.6°C about the same | 0.1°C about the same | 1,033 mm |
Drom weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Ceyzériat station; sunshine at Amberieu.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.1°C | 0.1°C | 3.1°C | 81 mm | 68 |
| February | 8.1°C | 0.2°C | 4.1°C | 69 mm | 98 |
| March | 12.9°C | 2.3°C | 7.6°C | 75 mm | 170 |
| April | 16.9°C | 5.4°C | 11.2°C | 86 mm | 194 |
| May | 20.8°C | 9.3°C | 15.1°C | 101 mm | 220 |
| June | 24.7°C | 12.7°C | 18.7°C | 76 mm | 252 |
| July | 26.6°C | 14.2°C | 20.4°C | 81 mm | 288 |
| August | 26.4°C | 13.9°C | 20.1°C | 87 mm | 261 |
| September | 21.9°C | 10.6°C | 16.2°C | 80 mm | 189 |
| October | 17.0°C | 8.2°C | 12.6°C | 104 mm | 122 |
| November | 10.5°C | 3.6°C | 7.0°C | 108 mm | 73 |
| December | 6.7°C | 0.9°C | 3.8°C | 87 mm | 55 |
| Year | 16.5°C | 6.8°C | 11.7°C | 1,033 mm | 1,989 |
Where Drom’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Ceyzériat, 6.4 km away: statistics for 1991–2020 (the station’s own years, 1994–2020, 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, Amberieu, 27 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 Drom’s climate
How warm does Drom get in summer?
July is the warmest month, with average highs of 26.6°C. About 69 days a year reach 25°C, more than 61% of mainland French towns, and about 20 reach 30°C.
How cold does Drom get in winter?
January nights average 0.1°C. The air drops to 0°C or below on about 65 nights a year, and about 9 days a year stay below freezing all day.
How much rain does Drom get?
About 1,033 mm a year, more than 89% of mainland French towns. November is the wettest month (108 mm) and February the driest (69 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Amberieu (27 km away), averages 1,989 hours of sunshine a year.
Are these figures for Drom itself?
No: they are the normals of the Météo-France station matched to Drom, Ceyzériat, 6.4 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 CEYZERIAT_SAPC, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Drom →
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.