Riom climate — normals and trends
Riom (France) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.2 °C and it receives 882 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 (18.6 °C on average) and the coldest is January (2.3 °C). Rainfall peaks in May.
Riom averages 66 frost days, 8 hot days (≥ 30 °C) and 148 rainy days per year.
Riom has warmed by +2.1 °C between 1940 and 2025, or +0.25 °C per decade. This trend is statistically significant.
The number of frost days there went from about 79 to 53 per year over the period.
The hottest day of the period reached 38.8 °C (on 12 August 2003) and the coldest -26.1 °C (on 16 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
RiomRhône-Alpes
- coords
- 45.89°, 3.11°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.2°C
Average daily high
14.6°C
Average daily low
6.0°C
Annual rainfall
882mm
Sunshine / day
8.3h
Mean relative humidity
77%
Average peak wind
14.8km/h
Seasonal range
16.3°C
Frost days (< 0 °C)
66 d/yr
Hot days (≥ 30 °C)
8 d/yr
Rainy days (≥ 1 mm)
148 d/yr
Annual snowfall
37.1 cm
Average feels-like high
12.7 °C
Average feels-like low
3.6 °C
Average peak gust
34.2 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.1 °C
since 1940
+0.3 °C per decade · r² = 0.49 · 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
38.8 °C
12 August 2003
Coldest day
-26.1 °C
16 January 1985
Wettest day
64 mm
8 July 1944
Windiest day
53.5 km/h
28 December 1999
Strongest gust
133.9 km/h
7 November 1982
Hottest feels-like
40.6 °C
29 June 2019
Coldest feels-like
-31.1 °C
16 January 1985
Snowiest day
21.4 cm
23 January 2007
Sunniest day
15.2 h
24 June 1947
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 | 8.1 °C | +2.6 °C | 66 mm | +6 mm |
| Feb | 10.5 °C | +3.3 °C | 38 mm | -16 mm |
| Mar | 12.0 °C | +1.1 °C | 64 mm | +3 mm |
| Apr | 16.9 °C | +3.1 °C | 55 mm | -22 mm |
| May | 19.6 °C | +2.0 °C | 86 mm | -12 mm |
| Jun | 26.9 °C | +5.6 °C | 98 mm | +14 mm |
| Jul | 25.1 °C | +1.3 °C | 52 mm | -24 mm |
| Aug | 27.3 °C | +3.8 °C | 125 mm | +37 mm |
| Sep | 19.8 °C | -0.4 °C | 129 mm | +46 mm |
| Oct | 15.5 °C | 0.0 °C | 75 mm | +5 mm |
| Nov | 11.4 °C | +1.8 °C | 104 mm | +36 mm |
| Dec | 9.4 °C | +3.1 °C | 53 mm | -9 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 Riom?
Riom has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.2 °C and it receives 882 mm of precipitation per year.
What is the hottest day ever recorded in Riom?
The hottest day measured in Riom between 1940 and 2025 was 12 August 2003, reaching 38.8 °C.
What is the coldest day in Riom?
The coldest day measured in Riom between 1940 and 2025 was 16 January 1985, at -26.1 °C.
Does it snow in Riom?
Yes. Riom gets on average 37.1 cm of snow per year and has around 66 frost days.
Has the climate of Riom warmed?
Yes: Riom warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Riom?
The wettest day measured in Riom between 1940 and 2025 was 8 July 1944, with 64 mm of rain in 24 hours.
What was the windiest day in Riom?
The windiest day measured in Riom between 1940 and 2025 was 28 December 1999, with winds reaching 53.5 km/h.
What is the warmest month in Riom?
The warmest month in Riom is July (18.6 °C on average); the coldest is January (2.3 °C).
How much does it rain in Riom?
Riom receives on average 882 mm of precipitation per year, spread over about 148 rainy days.
Is it sunny in Riom?
Riom gets on average 8.3 hours of sunshine per day, roughly 3,030 hours per year over 1940-2025.
What is the biggest single-day snowfall in Riom?
The heaviest 24-hour snowfall measured in Riom between 1940 and 2025 was 23 January 2007, with 21.4 cm.
Are there tropical nights in Riom?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Riom.
What was the most extreme apparent temperature in Riom?
In Riom, between 1940 and 2025, the highest apparent temperature reached 40.6 °C on 29 June 2019, and the lowest was -31.1 °C on 16 January 1985.
Compare Riom with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Riom