Saint Helier weather in November
In November, Saint Helier sees average daytime highs of 12°C and overnight lows near 10°C, with 132 mm of rain across 17.6 wet days and about 8.9 hours of daylight. It is the 7th-warmest and 2nd-wettest month of the year here.
Highs ease over the month, from about 14°C in the first days to 11°C by the end. The sky is clear or mostly clear about 14% of the time in November, and the air most often feels dry.
Daylight stretches from about 9 h 36 min at the start of November to 8 h 18 min by month's end. Set against the rest of the year, November is Saint Helier's 10th-clearest and 3rd-windiest month. For the whole year in context, see Saint Helier's year-round climate.
- Daytime high
- 12°
- 7th warmest
- Overnight low
- 10°
- 6th coldest
- Rainfall
- 132 mm
- 17.6 wet days
- Daylight
- 8 h 54 min
- 7:28 AM – 4:19 PM
- Cloud cover
- 73%
- 10th clearest
- Wind
- 30 km/h
- 3rd windiest
- Solar energy
- 1.21 kWh/m²
- Travel score
- 2.7
- out of 10
Saint Helier is one of the twelve parishes and capital of Jersey in the Channel Islands.
- Density
- 2,642/km²
- people per km²
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in November
Highs ease over the month, from about 14°C in the first days to 11°C by the end.
A typical November day in Saint Helier reaches about 12°C in the afternoon and slips back to 10°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 10°C and 15°C. Set against its neighbours, November runs about 3°C cooler than October and about 2°C warmer than December.
| 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) | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 11 | 11 |
| Avg low (°C) | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 9 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 14 | 12 |
| 2 | 14 | 12 |
| 3 | 14 | 12 |
| 4 | 14 | 12 |
| 5 | 14 | 12 |
| 6 | 13 | 11 |
| 7 | 13 | 11 |
| 8 | 13 | 11 |
| 9 | 13 | 11 |
| 10 | 13 | 11 |
| 11 | 13 | 11 |
| 12 | 13 | 11 |
| 13 | 13 | 11 |
| 14 | 12 | 11 |
| 15 | 12 | 10 |
| 16 | 12 | 10 |
| 17 | 12 | 10 |
| 18 | 12 | 10 |
| 19 | 12 | 10 |
| 20 | 12 | 10 |
| 21 | 12 | 10 |
| 22 | 12 | 10 |
| 23 | 12 | 10 |
| 24 | 11 | 10 |
| 25 | 11 | 9 |
| 26 | 11 | 9 |
| 27 | 11 | 9 |
| 28 | 11 | 9 |
| 29 | 11 | 9 |
| 30 | 11 | 9 |
Saint Helier weather by month
How November compares with the rest of the year at a glance. November is the 7th-warmest and 2nd-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 9° / 7° | 110 | 15.8 | 8.5 | 1.5 |
| Feb | 9° / 7° | 81 | 12.9 | 9.8 | 1.4 |
| Mar | 9° / 8° | 69 | 12.4 | 11.6 | 1.9 |
| Apr | 11° / 9° | 57 | 10.5 | 13.4 | 2.7 |
| May | 13° / 11° | 53 | 9.4 | 15 | 3.8 |
| Jun | 16° / 14° | 50 | 8.7 | 15.9 | 5.0 |
| Jul | 18° / 16° | 48 | 9.1 | 15.6 | 6.0 |
| Aug | 18° / 17° | 63 | 9.8 | 14.2 | 6.1 |
| Sep | 17° / 16° | 77 | 11 | 12.4 | 5.5 |
| Oct | 15° / 13° | 122 | 15.5 | 10.5 | 4.0 |
| Nov | 12° / 10° | 132 | 17.6 | 8.9 | 2.7 |
| Dec | 10° / 8° | 138 | 16.7 | 8.1 | 1.9 |
Cloud cover in November
The sky is clear or mostly clear about 14% of the time in November.
Beyond those clear spells, partly cloudy skies cover about 17% of November, with mostly cloudy or overcast conditions the remaining 69%.
| 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 (%) | 32 | 32 | 32 | 32 | 31 | 31 | 31 | 31 | 30 | 31 | 31 | 31 | 31 | 31 | 31 | 32 | 31 | 31 | 31 | 30 | 31 | 31 | 30 | 30 | 29 | 28 | 28 | 28 | 28 | 28 |
| Cloudier (%) | 68 | 68 | 68 | 68 | 69 | 69 | 69 | 69 | 70 | 69 | 69 | 69 | 69 | 69 | 69 | 68 | 69 | 69 | 69 | 70 | 69 | 69 | 70 | 70 | 71 | 72 | 72 | 72 | 72 | 72 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 32 | 68 |
| 2 | 32 | 68 |
| 3 | 32 | 68 |
| 4 | 32 | 68 |
| 5 | 31 | 69 |
| 6 | 31 | 69 |
| 7 | 31 | 69 |
| 8 | 31 | 69 |
| 9 | 30 | 70 |
| 10 | 31 | 69 |
| 11 | 31 | 69 |
| 12 | 31 | 69 |
| 13 | 31 | 69 |
| 14 | 31 | 69 |
| 15 | 31 | 69 |
| 16 | 32 | 68 |
| 17 | 31 | 69 |
| 18 | 31 | 69 |
| 19 | 31 | 69 |
| 20 | 30 | 70 |
| 21 | 31 | 69 |
| 22 | 31 | 69 |
| 23 | 30 | 70 |
| 24 | 30 | 70 |
| 25 | 29 | 71 |
| 26 | 28 | 72 |
| 27 | 28 | 72 |
| 28 | 28 | 72 |
| 29 | 28 | 72 |
| 30 | 28 | 72 |
Chance of precipitation in November
Saint Helier gets around 132 mm of rain over 17.6 wet days in November. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 58% and peaks near 61% on the wettest days.
| 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 (%) | 56 | 57 | 58 | 59 | 60 | 60 | 61 | 61 | 61 | 61 | 60 | 60 | 60 | 59 | 59 | 59 | 58 | 57 | 57 | 56 | 56 | 56 | 56 | 56 | 56 | 56 | 56 | 56 | 56 | 56 |
| Rain chance (%) | |
|---|---|
| 1 | 56 |
| 2 | 57 |
| 3 | 58 |
| 4 | 59 |
| 5 | 60 |
| 6 | 60 |
| 7 | 61 |
| 8 | 61 |
| 9 | 61 |
| 10 | 61 |
| 11 | 60 |
| 12 | 60 |
| 13 | 60 |
| 14 | 59 |
| 15 | 59 |
| 16 | 59 |
| 17 | 58 |
| 18 | 57 |
| 19 | 57 |
| 20 | 56 |
| 21 | 56 |
| 22 | 56 |
| 23 | 56 |
| 24 | 56 |
| 25 | 56 |
| 26 | 56 |
| 27 | 56 |
| 28 | 56 |
| 29 | 56 |
| 30 | 56 |
Humidity in November
Most of November feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, November lands in the dry band about 97% 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 (%) | 89 | 90 | 91 | 92 | 93 | 94 | 95 | 96 | 96 | 97 | 97 | 98 | 98 | 98 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Comfortable (%) | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 4 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | |
|---|---|---|
| 1 | 89 | 11 |
| 2 | 90 | 10 |
| 3 | 91 | 9 |
| 4 | 92 | 8 |
| 5 | 93 | 7 |
| 6 | 94 | 6 |
| 7 | 95 | 5 |
| 8 | 96 | 4 |
| 9 | 96 | 4 |
| 10 | 97 | 3 |
| 11 | 97 | 3 |
| 12 | 98 | 2 |
| 13 | 98 | 2 |
| 14 | 98 | 2 |
| 15 | 99 | 1 |
| 16 | 99 | 1 |
| 17 | 99 | 1 |
| 18 | 99 | 1 |
| 19 | 99 | 1 |
| 20 | 99 | 1 |
| 21 | 99 | 1 |
| 22 | 99 | 1 |
| 23 | 99 | 1 |
| 24 | 100 | 0 |
| 25 | 100 | 0 |
| 26 | 100 | 0 |
| 27 | 100 | 0 |
| 28 | 100 | 0 |
| 29 | 100 | 0 |
| 30 | 100 | 0 |
Wind in November
Winds average 30 km/h in November.
Across November, daily wind ranges from about 30 km/h on the calmest days to 30 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) | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 |
| Feels | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy | windy |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 30 | windy |
| 2 | 30 | windy |
| 3 | 30 | windy |
| 4 | 30 | windy |
| 5 | 30 | windy |
| 6 | 30 | windy |
| 7 | 30 | windy |
| 8 | 30 | windy |
| 9 | 30 | windy |
| 10 | 30 | windy |
| 11 | 30 | windy |
| 12 | 30 | windy |
| 13 | 30 | windy |
| 14 | 30 | windy |
| 15 | 30 | windy |
| 16 | 30 | windy |
| 17 | 30 | windy |
| 18 | 30 | windy |
| 19 | 30 | windy |
| 20 | 30 | windy |
| 21 | 30 | windy |
| 22 | 30 | windy |
| 23 | 30 | windy |
| 24 | 30 | windy |
| 25 | 30 | windy |
| 26 | 30 | windy |
| 27 | 30 | windy |
| 28 | 30 | windy |
| 29 | 30 | windy |
| 30 | 30 | windy |
Sunrise & sunset in November
Daylight runs from about 9 h 36 min at the start of November to 8 h 18 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 78 minutes over November. Sunrise moves from 7:04 AM to 7:48 AM, and sunset from 4:40 PM to 4:08 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) | 9.6 | 9.5 | 9.5 | 9.4 | 9.4 | 9.3 | 9.3 | 9.2 | 9.2 | 9.1 | 9.1 | 9.0 | 9.0 | 8.9 | 8.9 | 8.9 | 8.8 | 8.8 | 8.7 | 8.7 | 8.6 | 8.6 | 8.6 | 8.5 | 8.5 | 8.5 | 8.4 | 8.4 | 8.4 | 8.3 |
| Sunrise (AM) | 7:04 | 7:06 | 7:07 | 7:09 | 7:11 | 7:12 | 7:14 | 7:16 | 7:17 | 7:19 | 7:20 | 7:22 | 7:23 | 7:25 | 7:27 | 7:28 | 7:30 | 7:31 | 7:33 | 7:34 | 7:36 | 7:37 | 7:39 | 7:40 | 7:41 | 7:43 | 7:44 | 7:45 | 7:47 | 7:48 |
| Sunset (PM) | 4:40 | 4:38 | 4:37 | 4:35 | 4:34 | 4:32 | 4:31 | 4:29 | 4:28 | 4:27 | 4:25 | 4:24 | 4:23 | 4:22 | 4:20 | 4:19 | 4:18 | 4:17 | 4:16 | 4:15 | 4:14 | 4:13 | 4:12 | 4:12 | 4:11 | 4:10 | 4:09 | 4:09 | 4:08 | 4:08 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 9.6 | 7:04 | 4:40 |
| 2 | 9.5 | 7:06 | 4:38 |
| 3 | 9.5 | 7:07 | 4:37 |
| 4 | 9.4 | 7:09 | 4:35 |
| 5 | 9.4 | 7:11 | 4:34 |
| 6 | 9.3 | 7:12 | 4:32 |
| 7 | 9.3 | 7:14 | 4:31 |
| 8 | 9.2 | 7:16 | 4:29 |
| 9 | 9.2 | 7:17 | 4:28 |
| 10 | 9.1 | 7:19 | 4:27 |
| 11 | 9.1 | 7:20 | 4:25 |
| 12 | 9.0 | 7:22 | 4:24 |
| 13 | 9.0 | 7:23 | 4:23 |
| 14 | 8.9 | 7:25 | 4:22 |
| 15 | 8.9 | 7:27 | 4:20 |
| 16 | 8.9 | 7:28 | 4:19 |
| 17 | 8.8 | 7:30 | 4:18 |
| 18 | 8.8 | 7:31 | 4:17 |
| 19 | 8.7 | 7:33 | 4:16 |
| 20 | 8.7 | 7:34 | 4:15 |
| 21 | 8.6 | 7:36 | 4:14 |
| 22 | 8.6 | 7:37 | 4:13 |
| 23 | 8.6 | 7:39 | 4:12 |
| 24 | 8.5 | 7:40 | 4:12 |
| 25 | 8.5 | 7:41 | 4:11 |
| 26 | 8.5 | 7:43 | 4:10 |
| 27 | 8.4 | 7:44 | 4:09 |
| 28 | 8.4 | 7:45 | 4:09 |
| 29 | 8.4 | 7:47 | 4:08 |
| 30 | 8.3 | 7:48 | 4:08 |
Solar energy in November
Average shortwave solar energy reaching the ground each day in November, about 1.21 kWh/m².
For context, solar energy here swings from a low near 0.83 kWh/m² to a high of 6.27 kWh/m² in June across the year — November's 1.21 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 1.6 | 1.6 | 1.5 | 1.5 | 1.5 | 1.4 | 1.4 | 1.4 | 1.4 | 1.3 | 1.3 | 1.3 | 1.3 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 0.9 |
| 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 |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 1.6 | Dim |
| 2 | 1.6 | Dim |
| 3 | 1.5 | Dim |
| 4 | 1.5 | Dim |
| 5 | 1.5 | Dim |
| 6 | 1.4 | Dim |
| 7 | 1.4 | Dim |
| 8 | 1.4 | Dim |
| 9 | 1.4 | Dim |
| 10 | 1.3 | Dim |
| 11 | 1.3 | Dim |
| 12 | 1.3 | Dim |
| 13 | 1.3 | Dim |
| 14 | 1.2 | Dim |
| 15 | 1.2 | Dim |
| 16 | 1.2 | Dim |
| 17 | 1.2 | Dim |
| 18 | 1.2 | Dim |
| 19 | 1.1 | Dim |
| 20 | 1.1 | Dim |
| 21 | 1.1 | Dim |
| 22 | 1.1 | Dim |
| 23 | 1.1 | Dim |
| 24 | 1.0 | Dim |
| 25 | 1.0 | Dim |
| 26 | 1.0 | Dim |
| 27 | 1.0 | Dim |
| 28 | 1.0 | Dim |
| 29 | 1.0 | Dim |
| 30 | 0.9 | Dim |
Hazard calendar for Saint Helier
In November, Saint Helier sits inside its rainy season season. The full year is below, with each hazard's peak months called out.
Saint Helier's rainy season runs August–March, when most of the year's rain falls.
Is November a good time to visit Saint Helier?
Our two travel scores rate November for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
November is a weaker month for outdoor sightseeing in Saint Helier.
What to pack for Saint Helier in November
From November's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In November, Saint Helier sees daytime highs around 12°C and nights near 10°C. Pack rain gear and a windbreaker. Worth having: a warm layer. About 18 days see rain.
Sea temperature near Saint Helier in November
The nearest coast averages about 14°C in November — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 18°C and coldest in February near 9°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 10 | 9 | 9 | 10 | 12 | 15 | 17 | 18 | 18 | 16 | 14 | 11 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Cool | Cool | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 10 | Bracing |
| Feb | 9 | Bracing |
| Mar | 9 | Bracing |
| Apr | 10 | Bracing |
| May | 12 | Bracing |
| Jun | 15 | Bracing |
| Jul | 17 | Cool |
| Aug | 18 | Cool |
| Sep | 18 | Cool |
| Oct | 16 | Cool |
| Nov | 14 | Bracing |
| Dec | 11 | Bracing |
UV index in Saint Helier in November
Clear-sky midday UV in November peaks around 1. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Saint Helier peaks around August 13 at about 7 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 3 | 5 | 6 | 7 | 6 | 7 | 5 | 3 | 1 | 1 |
| Level | Low | Low | Moderate | Moderate | High | High | High | High | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Low |
| Mar | 3 | Moderate |
| Apr | 5 | Moderate |
| May | 6 | High |
| Jun | 7 | High |
| Jul | 6 | High |
| Aug | 7 | High |
| Sep | 5 | Moderate |
| Oct | 3 | Moderate |
| Nov | 1 | Low |
| Dec | 1 | Low |
Where is Saint Helier?
Saint Helier sits at 49.2°N, 2.1°W, 11 m above sea level, in Jersey. The nearest listed city is Saint Peter Port, 43 km away.
Topography around Saint Helier
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Saint Helier.
Within 3 km, the terrain around Saint Helier has only modest variations in elevation — a maximum elevation change of 100 m around an average of 31 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 137 m; within 80 km, significant variations in elevation — a maximum elevation change of 290 m.
The land around Saint Helier is covered by water (32%), trees (22%) and artificial surfaces (21%) within 3 km, water (85%) within 16 km, and water (68%) within 80 km.
Jersey travel facts
- Power plugs
- Type G
- 230 V · 50 Hz
- 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 Saint Helier (49.188°, -2.1049°, elevation 11 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).