Riom, France Climate
The warmest month is August, with an average high of 27°C; the coldest is March, with an average low of 2°C. A normal year brings 559 mm of precipitation.
Temperature through the year
The normal daily high and low and the record for every date at Clermont-Ferrand, since 1973. The line marks today.
- Normal low
- Normal high
- Record high
- Record low
Normals for Sep 29
- Normal high
- 21°C
- Record high
- 29°Cin 1985
- Record low
- 1°Cin 1995
- Chance of a wet day
- 42%
- Daylight
- 11 h 49 min
Month by month
Averages for 1991-2020. Wet days have at least 1 mm of precipitation in the reanalysis. Each month links to its own page.
| Month | Avg high | Avg low | Record high | Record low | Precipitation | Wet days |
|---|---|---|---|---|---|---|
| January | 8°C | 22°C (2002) | -23°C (1985) | 27 mm | 11.1 | |
| February | 10°C | 24°C (1998) | -17°C (2012) | 19 mm | 9.5 | |
| March | 14°C | 2°C | 26°C (2001) | -10°C (1976) | 25 mm | 9.7 |
| April | 17°C | 4°C | 29°C (1992) | -7°C (2003) | 47 mm | 12.3 |
| May | 21°C | 8°C | 33°C (2012) | -4°C (1976) | 64 mm | 13.7 |
| June | 25°C | 12°C | 39°C (2019) | 1°C (1975) | 67 mm | 12.0 |
| July | 27°C | 14°C | 41°C (1983) | 5°C (1984) | 61 mm | 11.2 |
| August | 27°C | 14°C | 40°C (2023) | 3°C (1976) | 66 mm | 10.0 |
| September | 23°C | 36°C (1987) | -1°C (2002) | 57 mm | 10.0 | |
| October | 18°C | 33°C (2023) | -9°C (1997) | 49 mm | 12.0 | |
| November | 12°C | 25°C (2015) | -11°C (1998) | 45 mm | 12.7 | |
| December | 9°C | 21°C (1989) | -14°C (1975) | 33 mm | 11.6 | |
| Year | 18°C | 559 mm | 136 |
Precipitation
Rain and melted snow together. The chance of a wet day is the share of days with at least 1 mm of precipitation in the reanalysis.
559 mm in a normal year, most in June.
Chance of a wet day
- Chance of a wet day
Humidity and comfort
NASA POWER reanalysis, 1991-2020, for the grid cell around Riom.
Days with a mean dew point of 18°C or more are rare here in every month.
| Month | Dew point | Humidity | Dry | Comfortable | Humid | Muggy | Oppressive | Miserable |
|---|---|---|---|---|---|---|---|---|
| January | 0°C | 91% | 100% | 0% | 0% | 0% | 0% | 0% |
| February | 0°C | 87% | 100% | 0% | 0% | 0% | 0% | 0% |
| March | 3°C | 82% | 100% | 0% | 0% | 0% | 0% | 0% |
| April | 5°C | 78% | 100% | 0% | 0% | 0% | 0% | 0% |
| May | 9°C | 76% | 90% | 9% | 1% | 0% | 0% | 0% |
| June | 11°C | 71% | 67% | 25% | 8% | 0% | 0% | 0% |
| July | 12°C | 64% | 61% | 31% | 8% | 0% | 0% | 0% |
| August | 11°C | 61% | 71% | 25% | 5% | 0% | 0% | 0% |
| September | 9°C | 69% | 87% | 11% | 1% | 0% | 0% | 0% |
| October | 7°C | 80% | 95% | 5% | 0% | 0% | 0% | 0% |
| November | 4°C | 88% | 100% | 0% | 0% | 0% | 0% | 0% |
| December | 1°C | 91% | 100% | 0% | 0% | 0% | 0% | 0% |
Comfort is judged by the day's mean dew point: dry below 13°C, comfortable to 16°C, humid to 18°C, muggy to 21°C, oppressive to 24°C, miserable above.
Clouds
Average share of the sky covered, from satellite (CERES and GEWEX SRB) by way of NASA POWER, 1991-2020.
The clearest month is August, with the sky 58 percent covered on average; the cloudiest is December, at 73 percent.
Wind
The mean wind speed over the whole day, from the MERRA-2 reanalysis by way of NASA POWER. Gusts run well above it.
The windiest month is February, averaging 15.5 km/h at 10 meters (33 feet) above the ground.
Daylight and sunshine
The longest day is Jun 21, with 15 h 45 min of daylight; the shortest is Dec 18, with 8 h 39 min.
- Day length
Solar energy
Average daily sunshine reaching the ground on a flat surface, in kilowatt-hours per square meter, clouds included.
Month pages
The weather in Riom in each month, day by day.
What this means
A normal is the average of the thirty years 1991 to 2020, the period the World Meteorological Organization and NOAA use for comparison. It is an average, not a forecast: most days depart from it, and some by a long way.
A record is the highest or lowest value on the date in every year the station has reported, back to 1973. It rests on one station, so a neighbor a few miles away can hold different ones.
Cloud, humidity, wind and sunshine come from a reanalysis: a weather model run over the past with every observation fed in, averaged over a grid cell about 50 km across. It is consistent everywhere on Earth; it smooths local detail such as a lake shore or a valley.
More for this place
Nearby
Sources
Records: NOAA GHCN-Daily, station FRM00007460, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-26. Sun and moon: computed with the NOAA solar equations and Meeus.