Voiron climate — normals and trends
Voiron (France) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.9 °C and it receives 1,282 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 (19.3 °C on average) and the coldest is January (0.5 °C). Rainfall peaks in May.
Voiron averages 83 frost days, 7 hot days (≥ 30 °C) and 153 rainy days per year.
Voiron has warmed by +2.9 °C between 1940 and 2025, or +0.34 °C per decade. This trend is statistically significant.
The number of frost days there went from about 111 to 55 per year over the period.
The hottest day of the period reached 36.8 °C (on 7 July 2015) and the coldest -25.3 °C (on 7 January 1985).
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
VoironRhône-Alpes
- coords
- 45.36°, 5.59°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.9°C
Average daily high
14.3°C
Average daily low
5.6°C
Annual rainfall
1,282mm
Sunshine / day
8.9h
Mean relative humidity
76%
Average peak wind
9.9km/h
Seasonal range
18.8°C
Frost days (< 0 °C)
83 d/yr
Hot days (≥ 30 °C)
7 d/yr
Rainy days (≥ 1 mm)
153 d/yr
Annual snowfall
108.9 cm
Average feels-like high
12.9 °C
Average feels-like low
3.6 °C
Average peak gust
34.6 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
13.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.9 °C
since 1940
+0.3 °C per decade · r² = 0.68 · 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
36.8 °C
7 July 2015
Coldest day
-25.3 °C
7 January 1985
Wettest day
84 mm
18 September 1973
Windiest day
28.6 km/h
25 October 2010
Strongest gust
113.8 km/h
28 December 1999
Hottest feels-like
39.2 °C
27 June 2019
Coldest feels-like
-30.0 °C
7 January 1985
Snowiest day
28.5 cm
9 December 1990
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 | 7.8 °C | +3.6 °C | 166 mm | +66 mm |
| Feb | 9.4 °C | +3.2 °C | 44 mm | -54 mm |
| Mar | 12.3 °C | +1.9 °C | 93 mm | -8 mm |
| Apr | 17.4 °C | +3.4 °C | 152 mm | +42 mm |
| May | 19.3 °C | +1.4 °C | 133 mm | -1 mm |
| Jun | 27.7 °C | +6.1 °C | 71 mm | -39 mm |
| Jul | 25.5 °C | +1.2 °C | 69 mm | -21 mm |
| Aug | 27.6 °C | +3.7 °C | 68 mm | -32 mm |
| Sep | 19.9 °C | -0.3 °C | 146 mm | +47 mm |
| Oct | 15.1 °C | -0.1 °C | 146 mm | +41 mm |
| Nov | 10.7 °C | +1.9 °C | 148 mm | +26 mm |
| Dec | 8.5 °C | +3.5 °C | 39 mm | -74 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 Voiron?
Voiron has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 9.9 °C and it receives 1,282 mm of precipitation per year.
What is the hottest day ever recorded in Voiron?
The hottest day measured in Voiron between 1940 and 2025 was 7 July 2015, reaching 36.8 °C.
What is the coldest day in Voiron?
The coldest day measured in Voiron between 1940 and 2025 was 7 January 1985, at -25.3 °C.
Does it snow in Voiron?
Yes. Voiron gets on average 108.9 cm of snow per year and has around 83 frost days.
Has the climate of Voiron warmed?
Yes: Voiron warmed by +2.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Voiron?
The wettest day measured in Voiron between 1940 and 2025 was 18 September 1973, with 84 mm of rain in 24 hours.
What was the windiest day in Voiron?
The windiest day measured in Voiron between 1940 and 2025 was 25 October 2010, with winds reaching 28.6 km/h.
What is the warmest month in Voiron?
The warmest month in Voiron is July (19.3 °C on average); the coldest is January (0.5 °C).
How much does it rain in Voiron?
Voiron receives on average 1,282 mm of precipitation per year, spread over about 153 rainy days.
Is it sunny in Voiron?
Voiron gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.
What is the biggest single-day snowfall in Voiron?
The heaviest 24-hour snowfall measured in Voiron between 1940 and 2025 was 9 December 1990, with 28.5 cm.
Are there tropical nights in Voiron?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Voiron.
What was the most extreme apparent temperature in Voiron?
In Voiron, between 1940 and 2025, the highest apparent temperature reached 39.2 °C on 27 June 2019, and the lowest was -30.0 °C on 7 January 1985.
Compare Voiron with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Voiron