Nyon weather in December
In December, Nyon sees average daytime highs of 5°C and overnight lows near 1°C, with 141 mm of precipitation across 14.7 wet days and about 8.5 hours of daylight. It is the 11th-warmest and 1st-wettest month of the year here.
Day-to-day highs hold fairly steady near 5°C through the month. The sky is clear or mostly clear about 18% of the time in December, and the air most often feels dry.
Daylight stretches from about 8 h 42 min at the start of December to 8 h 24 min by month's end. Set against the rest of the year, December is Nyon's 11th-clearest and 3rd-windiest month. For the whole year in context, see Nyon's year-round climate.
- Daytime high
- 5°
- 11th warmest
- Overnight low
- 1°
- 3rd coldest
- Precipitation
- 141 mm
- 14.7 wet days
- Daylight
- 8 h 24 min
- 8:19 AM – 4:44 PM
- Cloud cover
- 72%
- 11th clearest
- Wind
- 8 km/h
- 3rd windiest
- Solar energy
- 1.08 kWh/m²
- Travel score
- 0.1
- out of 10
Nyon is archaeological site in Nyon in the canton of Vaud, Suisse.
- Air quality
- Good
- PM2.5 7.7 µg/m³ · 2020
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in December
Day-to-day highs hold fairly steady near 5°C through the month.
A typical December day in Nyon reaches about 5°C in the afternoon and slips back to 1°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 1°C and 9°C. Set against its neighbours, December runs about 3°C cooler than November and on par with January.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Avg low (°C) | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 6 | 2 |
| 2 | 6 | 2 |
| 3 | 6 | 2 |
| 4 | 6 | 2 |
| 5 | 6 | 2 |
| 6 | 5 | 2 |
| 7 | 5 | 1 |
| 8 | 5 | 1 |
| 9 | 5 | 1 |
| 10 | 5 | 1 |
| 11 | 5 | 1 |
| 12 | 5 | 1 |
| 13 | 5 | 1 |
| 14 | 5 | 1 |
| 15 | 5 | 1 |
| 16 | 5 | 1 |
| 17 | 5 | 1 |
| 18 | 5 | 1 |
| 19 | 5 | 1 |
| 20 | 5 | 1 |
| 21 | 5 | 1 |
| 22 | 5 | 1 |
| 23 | 5 | 1 |
| 24 | 4 | 1 |
| 25 | 4 | 0 |
| 26 | 4 | 0 |
| 27 | 4 | 0 |
| 28 | 4 | 0 |
| 29 | 4 | 0 |
| 30 | 4 | 0 |
| 31 | 4 | 0 |
How December really feels in Nyon
Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 31 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
The story in December is cold — wind chill drags the overnight "feels like" below the raw low.
Nyon weather by month
How December compares with the rest of the year at a glance. December is the 11th-warmest and 1st-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 4° / -0° | 122 | 13.4 | 8.4 | 8.8 | 0.0 |
| Feb | 5° / 0° | 103 | 12.1 | 8.3 | 10 | 0.1 |
| Mar | 9° / 2° | 112 | 13.2 | 5.8 | 11.6 | 1.7 |
| Apr | 13° / 5° | 109 | 14.1 | 2.9 | 13.3 | 3.0 |
| May | 16° / 9° | 135 | 15.9 | 0.4 | 14.7 | 4.4 |
| Jun | 20° / 13° | 128 | 15.6 | 0 | 15.5 | 5.5 |
| Jul | 22° / 15° | 137 | 15.6 | 0 | 15.2 | 6.0 |
| Aug | 22° / 15° | 133 | 14.9 | 0 | 14 | 6.1 |
| Sep | 18° / 12° | 118 | 13.2 | 0 | 12.4 | 5.3 |
| Oct | 14° / 8° | 122 | 13.7 | 0.6 | 10.7 | 3.5 |
| Nov | 8° / 4° | 130 | 14 | 4.3 | 9.2 | 1.2 |
| Dec | 5° / 1° | 141 | 14.7 | 7.8 | 8.5 | 0.1 |
Cloud cover in December
The sky is clear or mostly clear about 18% of the time in December.
Beyond those clear spells, partly cloudy skies cover about 12% of December, with mostly cloudy or overcast conditions the remaining 70%.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 30 | 29 | 30 | 30 | 30 | 31 | 31 | 31 | 31 | 31 | 32 | 32 | 32 | 31 | 31 | 30 | 30 | 30 | 29 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 31 | 31 |
| Cloudier (%) | 70 | 71 | 70 | 70 | 70 | 69 | 69 | 69 | 69 | 69 | 68 | 68 | 68 | 69 | 69 | 70 | 70 | 70 | 71 | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 69 | 69 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 30 | 70 |
| 2 | 29 | 71 |
| 3 | 30 | 70 |
| 4 | 30 | 70 |
| 5 | 30 | 70 |
| 6 | 31 | 69 |
| 7 | 31 | 69 |
| 8 | 31 | 69 |
| 9 | 31 | 69 |
| 10 | 31 | 69 |
| 11 | 32 | 68 |
| 12 | 32 | 68 |
| 13 | 32 | 68 |
| 14 | 31 | 69 |
| 15 | 31 | 69 |
| 16 | 30 | 70 |
| 17 | 30 | 70 |
| 18 | 30 | 70 |
| 19 | 29 | 71 |
| 20 | 30 | 70 |
| 21 | 30 | 70 |
| 22 | 30 | 70 |
| 23 | 30 | 70 |
| 24 | 30 | 70 |
| 25 | 30 | 70 |
| 26 | 30 | 70 |
| 27 | 30 | 70 |
| 28 | 30 | 70 |
| 29 | 30 | 70 |
| 30 | 31 | 69 |
| 31 | 31 | 69 |
Chance of precipitation in December
Nyon gets around 141 mm of rain and snow over 14.7 wet days in December, the wettest month. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 47% and peaks near 48% on the wettest days, and about 8 days bring snow.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 46 | 46 | 47 | 47 | 47 | 47 | 47 | 47 | 47 | 47 | 47 | 47 | 47 | 47 | 47 | 47 | 47 | 47 | 47 | 47 | 47 | 47 | 48 | 48 | 48 | 48 | 48 | 48 | 48 | 48 | 48 |
| Snow chance (%) | 23 | 24 | 24 | 24 | 24 | 24 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 27 | 27 | 27 | 27 |
| Rain chance (%) | Snow chance (%) | |
|---|---|---|
| 1 | 46 | 23 |
| 2 | 46 | 24 |
| 3 | 47 | 24 |
| 4 | 47 | 24 |
| 5 | 47 | 24 |
| 6 | 47 | 24 |
| 7 | 47 | 25 |
| 8 | 47 | 25 |
| 9 | 47 | 25 |
| 10 | 47 | 25 |
| 11 | 47 | 25 |
| 12 | 47 | 25 |
| 13 | 47 | 25 |
| 14 | 47 | 25 |
| 15 | 47 | 25 |
| 16 | 47 | 24 |
| 17 | 47 | 24 |
| 18 | 47 | 24 |
| 19 | 47 | 24 |
| 20 | 47 | 25 |
| 21 | 47 | 25 |
| 22 | 47 | 25 |
| 23 | 48 | 25 |
| 24 | 48 | 26 |
| 25 | 48 | 26 |
| 26 | 48 | 26 |
| 27 | 48 | 26 |
| 28 | 48 | 27 |
| 29 | 48 | 27 |
| 30 | 48 | 27 |
| 31 | 48 | 27 |
Humidity in December
Most of December feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, December lands in the dry band about 100% 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Dry (%) | |
|---|---|
| 1 | 100 |
| 2 | 100 |
| 3 | 100 |
| 4 | 100 |
| 5 | 100 |
| 6 | 100 |
| 7 | 100 |
| 8 | 100 |
| 9 | 100 |
| 10 | 100 |
| 11 | 100 |
| 12 | 100 |
| 13 | 100 |
| 14 | 100 |
| 15 | 100 |
| 16 | 100 |
| 17 | 100 |
| 18 | 100 |
| 19 | 100 |
| 20 | 100 |
| 21 | 100 |
| 22 | 100 |
| 23 | 100 |
| 24 | 100 |
| 25 | 100 |
| 26 | 100 |
| 27 | 100 |
| 28 | 100 |
| 29 | 100 |
| 30 | 100 |
| 31 | 100 |
Wind in December
Winds average 8 km/h in December.
Across December, daily wind ranges from about 8 km/h on the calmest days to 8 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| 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 | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 8 | calm |
| 2 | 8 | calm |
| 3 | 8 | calm |
| 4 | 8 | calm |
| 5 | 8 | calm |
| 6 | 8 | calm |
| 7 | 8 | calm |
| 8 | 8 | calm |
| 9 | 8 | calm |
| 10 | 8 | calm |
| 11 | 8 | calm |
| 12 | 8 | calm |
| 13 | 8 | calm |
| 14 | 8 | calm |
| 15 | 8 | calm |
| 16 | 8 | calm |
| 17 | 8 | calm |
| 18 | 8 | calm |
| 19 | 8 | calm |
| 20 | 8 | calm |
| 21 | 8 | calm |
| 22 | 8 | calm |
| 23 | 8 | calm |
| 24 | 8 | calm |
| 25 | 8 | calm |
| 26 | 8 | calm |
| 27 | 8 | calm |
| 28 | 8 | calm |
| 29 | 8 | calm |
| 30 | 8 | calm |
| 31 | 8 | calm |
Sunrise & sunset in December
Daylight runs from about 8 h 42 min at the start of December to 8 h 24 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 18 minutes over December. Sunrise moves from 8:05 AM to 8:25 AM, and sunset from 4:45 PM to 4:51 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 8.7 | 8.6 | 8.6 | 8.6 | 8.6 | 8.6 | 8.5 | 8.5 | 8.5 | 8.5 | 8.5 | 8.5 | 8.4 | 8.4 | 8.4 | 8.4 | 8.4 | 8.4 | 8.4 | 8.4 | 8.4 | 8.4 | 8.4 | 8.4 | 8.4 | 8.4 | 8.4 | 8.4 | 8.4 | 8.4 | 8.4 |
| Sunrise (AM) | 8:05 | 8:06 | 8:07 | 8:08 | 8:09 | 8:10 | 8:11 | 8:12 | 8:13 | 8:14 | 8:15 | 8:16 | 8:17 | 8:17 | 8:18 | 8:19 | 8:19 | 8:20 | 8:21 | 8:21 | 8:22 | 8:22 | 8:23 | 8:23 | 8:24 | 8:24 | 8:24 | 8:24 | 8:25 | 8:25 | 8:25 |
| Sunset (PM) | 4:45 | 4:44 | 4:44 | 4:44 | 4:44 | 4:43 | 4:43 | 4:43 | 4:43 | 4:43 | 4:43 | 4:43 | 4:43 | 4:43 | 4:43 | 4:44 | 4:44 | 4:44 | 4:45 | 4:45 | 4:45 | 4:46 | 4:46 | 4:47 | 4:47 | 4:48 | 4:49 | 4:49 | 4:50 | 4:51 | 4:51 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 8.7 | 8:05 | 4:45 |
| 2 | 8.6 | 8:06 | 4:44 |
| 3 | 8.6 | 8:07 | 4:44 |
| 4 | 8.6 | 8:08 | 4:44 |
| 5 | 8.6 | 8:09 | 4:44 |
| 6 | 8.6 | 8:10 | 4:43 |
| 7 | 8.5 | 8:11 | 4:43 |
| 8 | 8.5 | 8:12 | 4:43 |
| 9 | 8.5 | 8:13 | 4:43 |
| 10 | 8.5 | 8:14 | 4:43 |
| 11 | 8.5 | 8:15 | 4:43 |
| 12 | 8.5 | 8:16 | 4:43 |
| 13 | 8.4 | 8:17 | 4:43 |
| 14 | 8.4 | 8:17 | 4:43 |
| 15 | 8.4 | 8:18 | 4:43 |
| 16 | 8.4 | 8:19 | 4:44 |
| 17 | 8.4 | 8:19 | 4:44 |
| 18 | 8.4 | 8:20 | 4:44 |
| 19 | 8.4 | 8:21 | 4:45 |
| 20 | 8.4 | 8:21 | 4:45 |
| 21 | 8.4 | 8:22 | 4:45 |
| 22 | 8.4 | 8:22 | 4:46 |
| 23 | 8.4 | 8:23 | 4:46 |
| 24 | 8.4 | 8:23 | 4:47 |
| 25 | 8.4 | 8:24 | 4:47 |
| 26 | 8.4 | 8:24 | 4:48 |
| 27 | 8.4 | 8:24 | 4:49 |
| 28 | 8.4 | 8:24 | 4:49 |
| 29 | 8.4 | 8:25 | 4:50 |
| 30 | 8.4 | 8:25 | 4:51 |
| 31 | 8.4 | 8:25 | 4:51 |
Solar energy in December
Average shortwave solar energy reaching the ground each day in December, about 1.08 kWh/m² — the year's lowest.
For context, solar energy here swings from a low near 1.08 kWh/m² to a high of 5.84 kWh/m² in July across the year — December's 1.08 kWh/m² sits near the bottom.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 |
| Level | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 1.2 | Dim |
| 2 | 1.2 | Dim |
| 3 | 1.2 | Dim |
| 4 | 1.2 | Dim |
| 5 | 1.2 | Dim |
| 6 | 1.1 | Dim |
| 7 | 1.1 | Dim |
| 8 | 1.1 | Dim |
| 9 | 1.1 | Dim |
| 10 | 1.1 | Dim |
| 11 | 1.1 | Dim |
| 12 | 1.1 | Dim |
| 13 | 1.1 | Dim |
| 14 | 1.1 | Dim |
| 15 | 1.1 | Dim |
| 16 | 1.1 | Dim |
| 17 | 1.1 | Dim |
| 18 | 1.1 | Dim |
| 19 | 1.1 | Dim |
| 20 | 1.1 | Dim |
| 21 | 1.1 | Dim |
| 22 | 1.1 | Dim |
| 23 | 1.1 | Dim |
| 24 | 1.1 | Dim |
| 25 | 1.1 | Dim |
| 26 | 1.1 | Dim |
| 27 | 1.1 | Dim |
| 28 | 1.1 | Dim |
| 29 | 1.1 | Dim |
| 30 | 1.1 | Dim |
| 31 | 1.1 | Dim |
Is December a good time to visit Nyon?
Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
December is a weaker month for outdoor sightseeing in Nyon.
What to pack for Nyon in December
From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In December, Nyon sees daytime highs around 5°C and nights near 1°C. Pack a warm layer and rain gear. Worth having: a heavy coat. About 15 days see rain.
UV index in Nyon in December
Clear-sky midday UV in December peaks around 1. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Nyon peaks around July 15 at about 9 (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 | 5 | 7 | 7 | 9 | 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 | 5 | High |
| May | 7 | High |
| Jun | 7 | Very high |
| Jul | 9 | Very high |
| Aug | 7 | High |
| Sep | 5 | Moderate |
| Oct | 3 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Where is Nyon?
Nyon sits at 46.4°N, 6.2°E, 401 m above sea level, in Switzerland. The nearest listed city is Thonon-les-Bains, 18 km away.
Topography around Nyon
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Nyon.
Within 3 km, the terrain around Nyon has only modest variations in elevation — a maximum elevation change of 115 m around an average of 402 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,301 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,546 m.
The land around Nyon is covered by water (39%) and cropland (20%) within 3 km, trees (41%) and water (24%) within 16 km, and trees (53%) and grassland (31%) within 80 km.
Switzerland travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / J
- 230 V · 50 Hz
- Prices
- ≈ 112% of US
- price level, 2025
- GDP per capita
- $114,769
- 2025
- Happiness
- 7.0 / 10
- World Happiness, 2025
- Safe drinking water
- 97%
- of population, 2024
- Homicide rate
- 0.6
- per 100k, 2023
- Road deaths
- 2.2
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- High
- EF EPI 564
- 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 Nyon (46.3832°, 6.2396°, elevation 401 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).