La Roche-sur-Foron climate — normals and trends
La Roche-sur-Foron (France) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 7.1 °C and it receives 1,574 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 (16.6 °C on average) and the coldest is January (-2.5 °C). Rainfall peaks in May.
La Roche-sur-Foron averages 131 frost days, 1 hot days (≥ 30 °C) and 167 rainy days per year.
La Roche-sur-Foron has warmed by +3.0 °C between 1940 and 2025, or +0.35 °C per decade. This trend is statistically significant.
The number of frost days there went from about 158 to 104 per year over the period.
The hottest day of the period reached 34.5 °C (on 7 July 2015) and the coldest -27.9 °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
La Roche-sur-ForonRhône-Alpes
- coords
- 46.07°, 6.30°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.1°C
Average daily high
11.7°C
Average daily low
2.6°C
Annual rainfall
1,574mm
Sunshine / day
8.8h
Mean relative humidity
78%
Average peak wind
7.8km/h
Seasonal range
19.1°C
Frost days (< 0 °C)
131 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
167 d/yr
Annual snowfall
244.4 cm
Average feels-like high
10.2 °C
Average feels-like low
0.2 °C
Average peak gust
31.9 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
13.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.0 °C
since 1940
+0.4 °C per decade · r² = 0.69 · 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
34.5 °C
7 July 2015
Coldest day
-27.9 °C
29 December 1941
Wettest day
71 mm
14 February 1990
Windiest day
24.5 km/h
25 April 1972
Strongest gust
124.6 km/h
28 December 1999
Hottest feels-like
36.1 °C
26 June 2019
Coldest feels-like
-32.7 °C
29 December 1941
Snowiest day
38.3 cm
17 April 2005
Sunniest day
15.0 h
20 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 | 5.4 °C | +3.9 °C | 206 mm | +79 mm |
| Feb | 6.7 °C | +3.2 °C | 55 mm | -62 mm |
| Mar | 10.8 °C | +3.5 °C | 67 mm | -51 mm |
| Apr | 15.5 °C | +4.3 °C | 133 mm | +12 mm |
| May | 17.0 °C | +1.4 °C | 146 mm | -14 mm |
| Jun | 25.6 °C | +6.4 °C | 139 mm | -15 mm |
| Jul | 23.3 °C | +1.8 °C | 123 mm | -16 mm |
| Aug | 25.4 °C | +4.4 °C | 97 mm | -42 mm |
| Sep | 17.9 °C | +0.2 °C | 183 mm | +68 mm |
| Oct | 12.9 °C | -0.1 °C | 205 mm | +93 mm |
| Nov | 8.2 °C | +1.8 °C | 160 mm | +26 mm |
| Dec | 6.1 °C | +3.9 °C | 35 mm | -103 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 La Roche-sur-Foron?
La Roche-sur-Foron has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 7.1 °C and it receives 1,574 mm of precipitation per year.
What is the hottest day ever recorded in La Roche-sur-Foron?
The hottest day measured in La Roche-sur-Foron between 1940 and 2025 was 7 July 2015, reaching 34.5 °C.
What is the coldest day in La Roche-sur-Foron?
The coldest day measured in La Roche-sur-Foron between 1940 and 2025 was 29 December 1941, at -27.9 °C.
Does it snow in La Roche-sur-Foron?
Yes. La Roche-sur-Foron gets on average 244.4 cm of snow per year and has around 131 frost days.
Has the climate of La Roche-sur-Foron warmed?
Yes: La Roche-sur-Foron warmed by +3.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in La Roche-sur-Foron?
The wettest day measured in La Roche-sur-Foron between 1940 and 2025 was 14 February 1990, with 71 mm of rain in 24 hours.
What was the windiest day in La Roche-sur-Foron?
The windiest day measured in La Roche-sur-Foron between 1940 and 2025 was 25 April 1972, with winds reaching 24.5 km/h.
What is the warmest month in La Roche-sur-Foron?
The warmest month in La Roche-sur-Foron is July (16.6 °C on average); the coldest is January (-2.5 °C).
How much does it rain in La Roche-sur-Foron?
La Roche-sur-Foron receives on average 1,574 mm of precipitation per year, spread over about 167 rainy days.
Is it sunny in La Roche-sur-Foron?
La Roche-sur-Foron gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.
What is the biggest single-day snowfall in La Roche-sur-Foron?
The heaviest 24-hour snowfall measured in La Roche-sur-Foron between 1940 and 2025 was 17 April 2005, with 38.3 cm.
Are there tropical nights in La Roche-sur-Foron?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in La Roche-sur-Foron.
What was the most extreme apparent temperature in La Roche-sur-Foron?
In La Roche-sur-Foron, between 1940 and 2025, the highest apparent temperature reached 36.1 °C on 26 June 2019, and the lowest was -32.7 °C on 29 December 1941.
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Nearby cities
The climate around La Roche-sur-Foron