Riom weather in September
In September, Riom sees average daytime highs of 21°C and overnight lows near 10°C, with 79 mm of rain across 10.2 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 6th-wettest month of the year here.
Highs ease over the month, from about 22°C in the first days to 19°C by the end. The sky is clear or mostly clear about 28% of the time in September, and the air most often feels dry.
Daylight stretches from about 13 h 06 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Riom's 3rd-clearest and 10th-windiest month. For the whole year in context, see Riom's year-round climate.
- Daytime high
- 21°
- 4th warmest
- Overnight low
- 10°
- 9th coldest
- Rainfall
- 79 mm
- 10.2 wet days
- Daylight
- 12 h 18 min
- 6:32 AM – 6:51 PM
- Cloud cover
- 59%
- 3rd clearest
- Wind
- 9 km/h
- 10th windiest
- Solar energy
- 3.85 kWh/m²
- Travel score
- 6.3
- out of 10
- Air quality
- Excellent
- PM10 13.5 µg/m³ · 2019
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Highs ease over the month, from about 22°C in the first days to 19°C by the end.
A typical September day in Riom reaches about 21°C in the afternoon and slips back to 10°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 27°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 18 |
| Avg low (°C) | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 23 | 11 |
| 2 | 22 | 11 |
| 3 | 22 | 11 |
| 4 | 22 | 11 |
| 5 | 22 | 11 |
| 6 | 22 | 11 |
| 7 | 22 | 11 |
| 8 | 22 | 11 |
| 9 | 21 | 11 |
| 10 | 21 | 10 |
| 11 | 21 | 10 |
| 12 | 21 | 10 |
| 13 | 21 | 10 |
| 14 | 21 | 10 |
| 15 | 21 | 10 |
| 16 | 20 | 10 |
| 17 | 20 | 10 |
| 18 | 20 | 10 |
| 19 | 20 | 9 |
| 20 | 20 | 9 |
| 21 | 20 | 9 |
| 22 | 20 | 9 |
| 23 | 19 | 9 |
| 24 | 19 | 9 |
| 25 | 19 | 9 |
| 26 | 19 | 9 |
| 27 | 19 | 9 |
| 28 | 19 | 9 |
| 29 | 19 | 9 |
| 30 | 18 | 9 |
How September really feels in Riom
Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Riom weather by month
How September compares with the rest of the year at a glance. September is the 4th-warmest and 6th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 7° / 0° | 59 | 12.4 | 3.5 | 8.9 | 0.7 |
| Feb | 8° / 0° | 48 | 11 | 3.3 | 10 | 1.2 |
| Mar | 12° / 2° | 54 | 11 | 1.2 | 11.6 | 3.0 |
| Apr | 15° / 5° | 79 | 13.1 | 0.6 | 13.3 | 4.1 |
| May | 19° / 8° | 93 | 14.1 | 0 | 14.7 | 5.3 |
| Jun | 22° / 12° | 79 | 11.9 | 0 | 15.5 | 6.3 |
| Jul | 25° / 13° | 84 | 10.5 | 0 | 15.2 | 6.9 |
| Aug | 25° / 13° | 85 | 10.9 | 0 | 14 | 6.9 |
| Sep | 21° / 10° | 79 | 10.2 | 0 | 12.3 | 6.3 |
| Oct | 16° / 7° | 72 | 11.2 | 0.2 | 10.7 | 4.8 |
| Nov | 10° / 3° | 72 | 12.7 | 1.2 | 9.3 | 2.2 |
| Dec | 7° / 1° | 61 | 12.3 | 2.5 | 8.5 | 0.9 |
Cloud cover in September
The sky is clear or mostly clear about 28% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 57%. Skies tend to cloud over as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 49 | 48 | 48 | 48 | 49 | 48 | 48 | 48 | 47 | 46 | 46 | 46 | 45 | 45 | 43 | 43 | 42 | 42 | 41 | 40 | 40 | 40 | 39 | 40 | 39 | 39 | 38 | 37 | 36 | 36 |
| Cloudier (%) | 51 | 52 | 52 | 52 | 51 | 52 | 52 | 52 | 53 | 54 | 54 | 54 | 55 | 55 | 57 | 57 | 58 | 58 | 59 | 60 | 60 | 60 | 61 | 60 | 61 | 61 | 62 | 63 | 64 | 64 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 49 | 51 |
| 2 | 48 | 52 |
| 3 | 48 | 52 |
| 4 | 48 | 52 |
| 5 | 49 | 51 |
| 6 | 48 | 52 |
| 7 | 48 | 52 |
| 8 | 48 | 52 |
| 9 | 47 | 53 |
| 10 | 46 | 54 |
| 11 | 46 | 54 |
| 12 | 46 | 54 |
| 13 | 45 | 55 |
| 14 | 45 | 55 |
| 15 | 43 | 57 |
| 16 | 43 | 57 |
| 17 | 42 | 58 |
| 18 | 42 | 58 |
| 19 | 41 | 59 |
| 20 | 40 | 60 |
| 21 | 40 | 60 |
| 22 | 40 | 60 |
| 23 | 39 | 61 |
| 24 | 40 | 60 |
| 25 | 39 | 61 |
| 26 | 39 | 61 |
| 27 | 38 | 62 |
| 28 | 37 | 63 |
| 29 | 36 | 64 |
| 30 | 36 | 64 |
Chance of precipitation in September
Riom gets around 79 mm of rain over 10.2 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 35% and peaks near 39% on the wettest days. The odds climb toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 35 | 36 | 37 | 38 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 38 | 38 | 39 | 39 | 39 | 39 |
| Rain chance (%) | |
|---|---|
| 1 | 29 |
| 2 | 29 |
| 3 | 29 |
| 4 | 29 |
| 5 | 29 |
| 6 | 29 |
| 7 | 30 |
| 8 | 31 |
| 9 | 32 |
| 10 | 33 |
| 11 | 34 |
| 12 | 35 |
| 13 | 35 |
| 14 | 36 |
| 15 | 37 |
| 16 | 38 |
| 17 | 39 |
| 18 | 39 |
| 19 | 39 |
| 20 | 39 |
| 21 | 39 |
| 22 | 39 |
| 23 | 39 |
| 24 | 39 |
| 25 | 38 |
| 26 | 38 |
| 27 | 39 |
| 28 | 39 |
| 29 | 39 |
| 30 | 39 |
Humidity in September
Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the dry band about 79% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 64 | 65 | 67 | 69 | 70 | 71 | 72 | 74 | 75 | 75 | 77 | 77 | 78 | 78 | 80 | 80 | 81 | 81 | 82 | 84 | 84 | 85 | 85 | 85 | 85 | 86 | 86 | 86 | 87 | 87 |
| Comfortable (%) | 26 | 25 | 24 | 23 | 23 | 22 | 22 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 19 | 19 | 18 | 18 | 17 | 16 | 16 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 13 | 13 |
| Humid (%) | 10 | 10 | 9 | 8 | 7 | 7 | 6 | 5 | 4 | 4 | 3 | 3 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | |
|---|---|---|---|
| 1 | 64 | 26 | 10 |
| 2 | 65 | 25 | 10 |
| 3 | 67 | 24 | 9 |
| 4 | 69 | 23 | 8 |
| 5 | 70 | 23 | 7 |
| 6 | 71 | 22 | 7 |
| 7 | 72 | 22 | 6 |
| 8 | 74 | 21 | 5 |
| 9 | 75 | 21 | 4 |
| 10 | 75 | 21 | 4 |
| 11 | 77 | 20 | 3 |
| 12 | 77 | 20 | 3 |
| 13 | 78 | 20 | 2 |
| 14 | 78 | 20 | 2 |
| 15 | 80 | 19 | 1 |
| 16 | 80 | 19 | 1 |
| 17 | 81 | 18 | 1 |
| 18 | 81 | 18 | 1 |
| 19 | 82 | 17 | 1 |
| 20 | 84 | 16 | 0 |
| 21 | 84 | 16 | 0 |
| 22 | 85 | 15 | 0 |
| 23 | 85 | 15 | 0 |
| 24 | 85 | 15 | 0 |
| 25 | 85 | 15 | 0 |
| 26 | 86 | 14 | 0 |
| 27 | 86 | 14 | 0 |
| 28 | 86 | 14 | 0 |
| 29 | 87 | 13 | 0 |
| 30 | 87 | 13 | 0 |
Wind in September
Winds average 9 km/h in September.
Across September, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 8 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 8 | calm |
| 2 | 9 | calm |
| 3 | 9 | calm |
| 4 | 9 | calm |
| 5 | 9 | calm |
| 6 | 9 | calm |
| 7 | 9 | calm |
| 8 | 9 | calm |
| 9 | 9 | calm |
| 10 | 9 | calm |
| 11 | 9 | calm |
| 12 | 9 | calm |
| 13 | 9 | calm |
| 14 | 9 | calm |
| 15 | 9 | calm |
| 16 | 9 | calm |
| 17 | 9 | calm |
| 18 | 9 | calm |
| 19 | 9 | calm |
| 20 | 9 | calm |
| 21 | 9 | calm |
| 22 | 9 | calm |
| 23 | 9 | calm |
| 24 | 9 | calm |
| 25 | 9 | calm |
| 26 | 9 | calm |
| 27 | 9 | calm |
| 28 | 9 | calm |
| 29 | 9 | calm |
| 30 | 9 | calm |
Sunrise & sunset in September
Daylight runs from about 13 h 06 min at the start of September to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 96 minutes over September. Sunrise moves from 6:13 AM to 6:51 AM, and sunset from 7:21 PM to 6:23 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 13.1 | 13.1 | 13.0 | 13.0 | 12.9 | 12.9 | 12.8 | 12.8 | 12.7 | 12.6 | 12.6 | 12.5 | 12.5 | 12.4 | 12.4 | 12.3 | 12.3 | 12.2 | 12.2 | 12.1 | 12.0 | 12.0 | 11.9 | 11.9 | 11.8 | 11.8 | 11.7 | 11.7 | 11.6 | 11.5 |
| Sunrise (AM) | 6:13 | 6:14 | 6:16 | 6:17 | 6:18 | 6:19 | 6:21 | 6:22 | 6:23 | 6:25 | 6:26 | 6:27 | 6:28 | 6:30 | 6:31 | 6:32 | 6:34 | 6:35 | 6:36 | 6:37 | 6:39 | 6:40 | 6:41 | 6:43 | 6:44 | 6:45 | 6:47 | 6:48 | 6:49 | 6:51 |
| Sunset (PM) | 7:21 | 7:19 | 7:18 | 7:16 | 7:14 | 7:12 | 7:10 | 7:08 | 7:06 | 7:04 | 7:02 | 7:00 | 6:58 | 6:56 | 6:53 | 6:51 | 6:49 | 6:47 | 6:45 | 6:43 | 6:41 | 6:39 | 6:37 | 6:35 | 6:33 | 6:31 | 6:29 | 6:27 | 6:25 | 6:23 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 13.1 | 6:13 | 7:21 |
| 2 | 13.1 | 6:14 | 7:19 |
| 3 | 13.0 | 6:16 | 7:18 |
| 4 | 13.0 | 6:17 | 7:16 |
| 5 | 12.9 | 6:18 | 7:14 |
| 6 | 12.9 | 6:19 | 7:12 |
| 7 | 12.8 | 6:21 | 7:10 |
| 8 | 12.8 | 6:22 | 7:08 |
| 9 | 12.7 | 6:23 | 7:06 |
| 10 | 12.6 | 6:25 | 7:04 |
| 11 | 12.6 | 6:26 | 7:02 |
| 12 | 12.5 | 6:27 | 7:00 |
| 13 | 12.5 | 6:28 | 6:58 |
| 14 | 12.4 | 6:30 | 6:56 |
| 15 | 12.4 | 6:31 | 6:53 |
| 16 | 12.3 | 6:32 | 6:51 |
| 17 | 12.3 | 6:34 | 6:49 |
| 18 | 12.2 | 6:35 | 6:47 |
| 19 | 12.2 | 6:36 | 6:45 |
| 20 | 12.1 | 6:37 | 6:43 |
| 21 | 12.0 | 6:39 | 6:41 |
| 22 | 12.0 | 6:40 | 6:39 |
| 23 | 11.9 | 6:41 | 6:37 |
| 24 | 11.9 | 6:43 | 6:35 |
| 25 | 11.8 | 6:44 | 6:33 |
| 26 | 11.8 | 6:45 | 6:31 |
| 27 | 11.7 | 6:47 | 6:29 |
| 28 | 11.7 | 6:48 | 6:27 |
| 29 | 11.6 | 6:49 | 6:25 |
| 30 | 11.5 | 6:51 | 6:23 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 3.85 kWh/m².
For context, solar energy here swings from a low near 1.1 kWh/m² to a high of 5.93 kWh/m² in July across the year — September's 3.85 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.5 | 4.5 | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.1 | 4.1 | 4.0 | 4.0 | 3.9 | 3.9 | 3.8 | 3.8 | 3.7 | 3.6 | 3.6 | 3.5 | 3.5 | 3.4 | 3.4 | 3.3 | 3.3 | 3.2 | 3.2 | 3.1 | 3.0 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.5 | Bright |
| 2 | 4.5 | Bright |
| 3 | 4.4 | Bright |
| 4 | 4.4 | Bright |
| 5 | 4.3 | Bright |
| 6 | 4.3 | Bright |
| 7 | 4.3 | Bright |
| 8 | 4.2 | Bright |
| 9 | 4.2 | Bright |
| 10 | 4.1 | Bright |
| 11 | 4.1 | Bright |
| 12 | 4.0 | Bright |
| 13 | 4.0 | Moderate |
| 14 | 3.9 | Moderate |
| 15 | 3.9 | Moderate |
| 16 | 3.8 | Moderate |
| 17 | 3.8 | Moderate |
| 18 | 3.7 | Moderate |
| 19 | 3.6 | Moderate |
| 20 | 3.6 | Moderate |
| 21 | 3.5 | Moderate |
| 22 | 3.5 | Moderate |
| 23 | 3.4 | Moderate |
| 24 | 3.4 | Moderate |
| 25 | 3.3 | Moderate |
| 26 | 3.3 | Moderate |
| 27 | 3.2 | Moderate |
| 28 | 3.2 | Moderate |
| 29 | 3.1 | Moderate |
| 30 | 3.0 | Moderate |
Is September a good time to visit Riom?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a reasonable time to visit Riom for sightseeing.
What to pack for Riom in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Riom sees daytime highs around 21°C and nights near 10°C. Worth packing: rain gear. About 10 days see rain.
UV index in Riom in September
Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Riom peaks around July 15 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 4 | 6 | 7 | 7 | 8 | 7 | 5 | 3 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | High | Very high | Very high | High | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Moderate |
| Mar | 4 | Moderate |
| Apr | 6 | High |
| May | 7 | High |
| Jun | 7 | Very high |
| Jul | 8 | Very high |
| Aug | 7 | High |
| Sep | 5 | Moderate |
| Oct | 3 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Where is Riom?
Riom sits at 45.9°N, 3.1°E, 362 m above sea level, in France. The nearest listed city is Clermont-Ferrand, 13 km away.
Topography around Riom
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Riom.
Within 3 km, the terrain around Riom has only modest variations in elevation — a maximum elevation change of 196 m around an average of 350 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 907 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,675 m.
The land around Riom is covered by cropland (32%), artificial surfaces (27%) and trees (22%) within 3 km, cropland (39%), trees (28%) and grassland (22%) within 16 km, and grassland (46%) and trees (38%) within 80 km.
France travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / E
- 230 V · 50 Hz
- Prices
- ≈ 77% of US
- price level, 2025
- GDP per capita
- $48,986
- 2025
- Happiness
- 6.6 / 10
- World Happiness, 2025
- Safe drinking water
- 100%
- of population, 2024
- Homicide rate
- 1.3
- per 100k, 2023
- Road deaths
- 5.1
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 539
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Riom (45.8936°, 3.1126°, elevation 362 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).