Saint Helier weather in December

In December, Saint Helier sees average daytime highs of 10°C and overnight lows near 8°C, with 138 mm of precipitation across 16.7 wet days and about 8.1 hours of daylight. It is the 9th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 10°C through the month. The sky is clear or mostly clear about 12% of the time in December, and the air most often feels dry.

Daylight stretches from about 8 h 18 min at the start of December to 8 hours by month's end. Set against the rest of the year, December is Saint Helier's 11th-clearest and 1st-windiest month. For the whole year in context, see Saint Helier's year-round climate.

Daytime high
10°
9th warmest
Overnight low
4th coldest
Precipitation
138 mm
16.7 wet days
Daylight
8 hours
8:04 AM – 4:05 PM
Cloud cover
73%
11th clearest
Wind
31 km/h
1st windiest
Solar energy
0.83 kWh/m²
Travel score
1.9
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 December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 10°C through the month.

A typical December day in Saint Helier reaches about 10°C in the afternoon and slips back to 8°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 7°C and 13°C. Set against its neighbours, December runs about 2°C cooler than November and about 1°C warmer than January.

10°15°151015202531
Avg high (°C)Avg low (°C)
1119
2119
3119
4119
5119
6119
7118
8108
9108
10108
11108
12108
13108
14108
15108
16108
17108
18108
19108
20108
21108
22108
23108
24108
25108
26108
27108
28107
29107
30107
31107

Saint Helier weather by month

How December compares with the rest of the year at a glance. December is the 9th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan / 11015.88.51.5
Feb / 8112.99.81.4
Mar / 6912.411.61.9
Apr11° / 5710.513.42.7
May13° / 11°539.4153.8
Jun16° / 14°508.715.95.0
Jul18° / 16°489.115.66.0
Aug18° / 17°639.814.26.1
Sep17° / 16°771112.45.5
Oct15° / 13°12215.510.54.0
Nov12° / 10°13217.68.92.7
Dec10° / 13816.78.11.9

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 12% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 15% of December, with mostly cloudy or overcast conditions the remaining 73%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12773
22872
32872
42872
52872
62872
72872
82872
92872
102773
112773
122773
132773
142773
152674
162674
172674
182674
192575
202575
212575
222575
232674
242773
252773
262773
272773
282773
292872
302872
312872

Chance of precipitation in December

Any precipitation

Saint Helier gets around 138 mm of rain and snow over 16.7 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 54% and peaks near 56% on the wettest days, and about 0 day brings snow.

0%20%40%60%151015202531
Rain chance (%)
156
255
355
454
554
653
753
852
952
1052
1153
1253
1353
1454
1554
1654
1755
1855
1955
2055
2156
2256
2356
2455
2555
2655
2754
2854
2954
3053
3153

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

Wind in December

Winds average 31 km/h in December, the windiest month of the year.

Across December, daily wind ranges from about 30 km/h on the calmest days to 31 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202531
Wind speed (km/h)Feels
130windy
231windy
331windy
431windy
531windy
631windy
731windy
831windy
931windy
1031windy
1131windy
1231windy
1331windy
1431windy
1531windy
1631windy
1731windy
1831windy
1931windy
2031windy
2131windy
2231windy
2331windy
2431windy
2531windy
2631windy
2731windy
2831windy
2931windy
3031windy
3131windy

Sunrise & sunset in December

DaylightNight

Daylight runs from about 8 h 18 min at the start of December to 8 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 18 minutes over December. Sunrise moves from 7:49 AM to 8:10 AM, and sunset from 4:07 PM to 4:13 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
18.37:494:07
28.37:514:07
38.27:524:06
48.27:534:06
58.27:544:05
68.27:554:05
78.17:564:05
88.17:574:05
98.17:584:05
108.17:594:04
118.18:004:04
128.18:014:04
138.08:024:04
148.08:034:05
158.08:044:05
168.08:044:05
178.08:054:05
188.08:064:05
198.08:064:06
208.08:074:06
218.08:074:06
228.08:084:07
238.08:084:07
248.08:094:08
258.08:094:08
268.08:094:09
278.08:104:10
288.08:104:10
298.08:104:11
308.08:104:12
318.08:104:13

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 0.83 kWh/m² — the year's lowest.

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 — December's 0.83 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
10.9Dim
20.9Dim
30.9Dim
40.9Dim
50.9Dim
60.9Dim
70.9Dim
80.9Dim
90.9Dim
100.8Dim
110.8Dim
120.8Dim
130.8Dim
140.8Dim
150.8Dim
160.8Dim
170.8Dim
180.8Dim
190.8Dim
200.8Dim
210.8Dim
220.8Dim
230.8Dim
240.8Dim
250.8Dim
260.8Dim
270.8Dim
280.8Dim
290.8Dim
300.8Dim
310.8Dim
Planning a trip in December

Hazard calendar for Saint Helier

In seasonPeak

In December, 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.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Saint Helier?

Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

1.9
Sightseeing
9th-best month of the year
0.0
Beach & pool
8th-best month of the year

December is a weaker month for outdoor sightseeing in Saint Helier.

What to pack for Saint Helier in December

From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In December, Saint Helier sees daytime highs around 10°C and nights near 8°C. Pack a warm layer, rain gear and a windbreaker. About 17 days see rain.

a warm layerrain geara windbreaker

Sea temperature near Saint Helier in December

The nearest coast averages about 11°C in December — 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.

10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan10Bracing
Feb9Bracing
Mar9Bracing
Apr10Bracing
May12Bracing
Jun15Bracing
Jul17Cool
Aug18Cool
Sep18Cool
Oct16Cool
Nov14Bracing
Dec11Bracing

UV index in Saint Helier in December

LowModerateHighVery highExtreme

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 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowAug 13UV 7Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr5Moderate
May6High
Jun7High
Jul6High
Aug7High
Sep5Moderate
Oct3Moderate
Nov1Low
Dec1Low
Location & terrain

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.

3 km
100 m
16 km
137 m
80 km
290 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Saint Peter Port 43 km · Octeville 59 km · Saint-Malo 61 km · Équeurdreville-Hainneville 61 km · Cherbourg 61 km · Tourlaville 63 km · Saint-Lô 74 km · Saint-Brieuc 89 km

Jersey travel facts

Power plugs
Type G
230 V · 50 Hz
Religion
Christian 85%agnostic 13%atheist 1%Baha'i 0%

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).