Crolles climate — normals and trends
Crolles (France) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 5.6 °C and it receives 1,613 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 (15.2 °C on average) and the coldest is January (-3.9 °C). Rainfall peaks in May.
Crolles averages 160 frost days, 0 hot days (≥ 30 °C) and 173 rainy days per year.
Crolles has warmed by +2.8 °C between 1940 and 2025, or +0.33 °C per decade. This trend is statistically significant.
The number of frost days there went from about 184 to 136 per year over the period.
The hottest day of the period reached 32.6 °C (on 7 July 2015) and the coldest -29.9 °C (on 5 January 1995).
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
CrollesRhône-Alpes
- coords
- 45.28°, 5.88°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
5.6°C
Average daily high
10.3°C
Average daily low
0.9°C
Annual rainfall
1,613mm
Sunshine / day
9.3h
Mean relative humidity
78%
Average peak wind
6.7km/h
Seasonal range
19.1°C
Frost days (< 0 °C)
160 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
173 d/yr
Annual snowfall
333.1 cm
Average feels-like high
8.8 °C
Average feels-like low
-1.7 °C
Average peak gust
36.8 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
14.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.8 °C
since 1940
+0.3 °C per decade · r² = 0.66 · 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
32.6 °C
7 July 2015
Coldest day
-29.9 °C
5 January 1995
Wettest day
70 mm
14 February 1990
Windiest day
14.8 km/h
18 April 1991
Strongest gust
141.8 km/h
8 November 1982
Hottest feels-like
33.7 °C
7 July 2015
Coldest feels-like
-34.7 °C
15 February 1940
Snowiest day
35.8 cm
21 March 1971
Sunniest day
15.0 h
27 May 1940
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 4.3 °C | +4.0 °C | 226 mm | +98 mm |
| Feb | 6.4 °C | +4.2 °C | 52 mm | -69 mm |
| Mar | 8.1 °C | +2.5 °C | 98 mm | -25 mm |
| Apr | 12.8 °C | +3.9 °C | 169 mm | +39 mm |
| May | 15.4 °C | +1.7 °C | 206 mm | +37 mm |
| Jun | 23.4 °C | +5.6 °C | 118 mm | -41 mm |
| Jul | 20.9 °C | +0.6 °C | 127 mm | -3 mm |
| Aug | 22.5 °C | +2.6 °C | 102 mm | -30 mm |
| Sep | 16.5 °C | -0.1 °C | 146 mm | +28 mm |
| Oct | 12.2 °C | +0.1 °C | 173 mm | +53 mm |
| Nov | 7.3 °C | +2.0 °C | 163 mm | +20 mm |
| Dec | 5.5 °C | +4.6 °C | 33 mm | -108 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 Crolles?
Crolles has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 5.6 °C and it receives 1,613 mm of precipitation per year.
What is the hottest day ever recorded in Crolles?
The hottest day measured in Crolles between 1940 and 2025 was 7 July 2015, reaching 32.6 °C.
What is the coldest day in Crolles?
The coldest day measured in Crolles between 1940 and 2025 was 5 January 1995, at -29.9 °C.
Does it snow in Crolles?
Yes. Crolles gets on average 333.1 cm of snow per year and has around 160 frost days.
Has the climate of Crolles warmed?
Yes: Crolles warmed by +2.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Crolles?
The wettest day measured in Crolles between 1940 and 2025 was 14 February 1990, with 70 mm of rain in 24 hours.
What was the windiest day in Crolles?
The windiest day measured in Crolles between 1940 and 2025 was 18 April 1991, with winds reaching 14.8 km/h.
What is the warmest month in Crolles?
The warmest month in Crolles is July (15.2 °C on average); the coldest is January (-3.9 °C).
How much does it rain in Crolles?
Crolles receives on average 1,613 mm of precipitation per year, spread over about 173 rainy days.
Is it sunny in Crolles?
Crolles gets on average 9.3 hours of sunshine per day, roughly 3,395 hours per year over 1940-2025.
What is the biggest single-day snowfall in Crolles?
The heaviest 24-hour snowfall measured in Crolles between 1940 and 2025 was 21 March 1971, with 35.8 cm.
Are there tropical nights in Crolles?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Crolles.
What was the most extreme apparent temperature in Crolles?
In Crolles, between 1940 and 2025, the highest apparent temperature reached 33.7 °C on 7 July 2015, and the lowest was -34.7 °C on 15 February 1940.
Compare Crolles with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Crolles