Oyonnax climate — normals and trends
Oyonnax (France) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.1 °C and it receives 1,608 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (18.2 °C on average) and the coldest is January (0.1 °C). Rainfall peaks in December.
Oyonnax averages 84 frost days, 4 hot days (≥ 30 °C) and 166 rainy days per year.
Oyonnax has warmed by +2.7 °C between 1940 and 2025, or +0.32 °C per decade. This trend is statistically significant.
The number of frost days there went from about 110 to 58 per year over the period.
The hottest day of the period reached 37.6 °C (on 7 July 2015) and the coldest -25.7 °C (on 29 December 1941).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
OyonnaxRhône-Alpes
- coords
- 46.26°, 5.66°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.1°C
Average daily high
13.2°C
Average daily low
5.3°C
Annual rainfall
1,608mm
Sunshine / day
8.7h
Mean relative humidity
79%
Average peak wind
11.4km/h
Seasonal range
18.1°C
Frost days (< 0 °C)
84 d/yr
Hot days (≥ 30 °C)
4 d/yr
Rainy days (≥ 1 mm)
166 d/yr
Annual snowfall
143.9 cm
Average feels-like high
11.5 °C
Average feels-like low
3.2 °C
Average peak gust
33.5 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.7 °C
since 1940
+0.3 °C per decade · r² = 0.65 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
37.6 °C
7 July 2015
Coldest day
-25.7 °C
29 December 1941
Wettest day
93 mm
14 February 1990
Windiest day
37.9 km/h
25 April 1972
Strongest gust
117.0 km/h
26 December 1999
Hottest feels-like
39.9 °C
27 June 2019
Coldest feels-like
-30.5 °C
29 December 1941
Snowiest day
30.6 cm
9 February 1999
Sunniest day
15.0 h
26 May 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 6.0 °C | +2.9 °C | 195 mm | +57 mm |
| Feb | 7.6 °C | +2.5 °C | 71 mm | -56 mm |
| Mar | 12.0 °C | +2.7 °C | 83 mm | -42 mm |
| Apr | 16.6 °C | +3.5 °C | 131 mm | +8 mm |
| May | 18.5 °C | +1.5 °C | 132 mm | -15 mm |
| Jun | 26.5 °C | +5.9 °C | 143 mm | +5 mm |
| Jul | 24.5 °C | +1.6 °C | 109 mm | -11 mm |
| Aug | 26.4 °C | +4.0 °C | 103 mm | -33 mm |
| Sep | 18.9 °C | 0.0 °C | 198 mm | +71 mm |
| Oct | 13.9 °C | -0.2 °C | 228 mm | +102 mm |
| Nov | 9.2 °C | +1.4 °C | 174 mm | +25 mm |
| Dec | 6.6 °C | +2.6 °C | 58 mm | -94 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Oyonnax?
Oyonnax has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 9.1 °C and it receives 1,608 mm of precipitation per year.
What is the hottest day ever recorded in Oyonnax?
The hottest day measured in Oyonnax between 1940 and 2025 was 7 July 2015, reaching 37.6 °C.
What is the coldest day in Oyonnax?
The coldest day measured in Oyonnax between 1940 and 2025 was 29 December 1941, at -25.7 °C.
Does it snow in Oyonnax?
Yes. Oyonnax gets on average 143.9 cm of snow per year and has around 84 frost days.
Has the climate of Oyonnax warmed?
Yes: Oyonnax warmed by +2.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Oyonnax?
The wettest day measured in Oyonnax between 1940 and 2025 was 14 February 1990, with 93 mm of rain in 24 hours.
What was the windiest day in Oyonnax?
The windiest day measured in Oyonnax between 1940 and 2025 was 25 April 1972, with winds reaching 37.9 km/h.
What is the warmest month in Oyonnax?
The warmest month in Oyonnax is July (18.2 °C on average); the coldest is January (0.1 °C).
How much does it rain in Oyonnax?
Oyonnax receives on average 1,608 mm of precipitation per year, spread over about 166 rainy days.
Is it sunny in Oyonnax?
Oyonnax gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.
What is the biggest single-day snowfall in Oyonnax?
The heaviest 24-hour snowfall measured in Oyonnax between 1940 and 2025 was 9 February 1999, with 30.6 cm.
Are there tropical nights in Oyonnax?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Oyonnax.
What was the most extreme apparent temperature in Oyonnax?
In Oyonnax, between 1940 and 2025, the highest apparent temperature reached 39.9 °C on 27 June 2019, and the lowest was -30.5 °C on 29 December 1941.
Compare Oyonnax with another city
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Nearby cities
The climate around Oyonnax