Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average sea temperature in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December's arrival in Saint Helier, Jersey, brings an average high-temperature of a still fresh 10.9°C (51.6°F), demonstrating subtle variation from the preceding month. Saint Helier's nighttime temperature in December shows a minor descent, with a steady average of 8.7°C (47.7°F).Humidity
November and December, with an average relative humidity of 78%, are the least humid months in Saint Helier, Jersey.Rainfall
In Saint Helier, Jersey, in December, it is raining for 20 days, with typically 66mm (2.6") of accumulated precipitation. In Saint Helier, during the entire year, the rain falls for 189 days and collects up to 538mm (21.18") of precipitation.Snowfall
Months with snowfall in Saint Helier are January through March, November and December. In December, it is snowing for 0.2 days. Throughout December, 1mm (0.04") of snow is accumulated. Throughout the year, there are 1.4 snowfall days, and 6mm (0.24") of snow is accumulated.Sea temperature
In Saint Helier, in December, the average water temperature is 11°C (51.8°F).Note: Danger awaits those who swim in 11°C (51.8°F) without protection. Falling below 10°C (50°F) means intense cold shock and hyperventilation.
Daylight
With an average of 8h and 18min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 07:42 and sunset at 16:12. On the last day of December, in Saint Helier, sunrise is at 08:03 and sunset at 16:20 GMT.
Sunshine
In December, the average sunshine in Saint Helier is 4.1h.UV index
In December, the average daily maximum UV index in Saint Helier is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: In December, the maximum UV index of 3 translates into these guidelines:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Frequently asked questions
What are December temperatures in Saint Helier?
What is the least humid month in Saint Helier?
What is the average humidity in December in Saint Helier?
How much does it rain in Saint Helier in December?
How much does it snow in Saint Helier in December?
How cold is the water in December in Saint Helier?
What is the month with the shortest days in Saint Helier?
What is the average length of the day in December in Saint Helier?
When are sunrise and sunset in December in Saint Helier?
How long on average sun shines in December in Saint Helier?
How high is the UV index in December in Saint Helier?
Average temperature in December
Saint Helier, Jersey
- Average high temperature in December: 10.9°C
The warmest month (with the highest average high temperature) is August (18.2°C).
The month with the lowest average high temperature is February (9°C).
- Average low temperature in December: 8.7°C
The month with the highest average low temperature is August (16.3°C).
The coldest month (with the lowest average low temperature) is February (6.8°C).
Average pressure in December
Saint Helier, Jersey
- Average pressure in December: 1017mbar
The month with the highest atmospheric pressure is September (1018mbar).
The month with the lowest atmospheric pressure is November (1011.8mbar).
Average wind speed in December
Saint Helier, Jersey
- Average wind speed in December: 34km/h
The windiest month (with the highest average wind speed) is December (34km/h).
The calmest month (with the lowest average wind speed) is July (20.4km/h).
Average humidity in December
Saint Helier, Jersey
- Average humidity in December: 78%
The months with the highest relative humidity are June and July (83%).
The months with the lowest relative humidity are November and December (78%).
Average rainfall in December
Saint Helier, Jersey
- Average rainfall in December: 66mm
The wettest month (with the highest rainfall) is November (78mm).
The driest month (with the least rainfall) is July (25mm).
Average rainfall days in December
Saint Helier, Jersey
- Average rainfall days in December: 20 days
The month with the highest number of rainy days is November (21.2 days).
The months with the least rainy days are May and July (12.2 days).
Average snowfall in December
Saint Helier, Jersey
- Average snowfall in December: 1mm
The month with the highest snowfall is January (2mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in December
Saint Helier, Jersey
- Average snowfall days in December: 0.2 days
The months with the highest number of snowfall days are January and February (0.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in December
Saint Helier, Jersey
- Average sea temperature in December: 11°C
The best month for swimming (with the highest average sea temperature) is August (17°C).
The coldest months (with the lowest average sea temperature) are February and March (9°C).
Average daylight in December /
Average sunshine in December
Saint Helier, Jersey
- Average daylight in December: 8h and 2min
The month with the longest days is June (Average daylight: 16h and 12min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in December: 4h and 1min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The months with the least sunshine are January and November (Average sunshine: 4h and 0min).
Average sunshine days in December
Saint Helier, Jersey
- Average sunshine days in December: 7.3 days
The month with the most sunshine days is May (16.8 days).
The month with the least sunshine days is November (5.8 days).
Average UV index in December
Saint Helier, Jersey
- Average UV index in December: 3
The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are January and February (UV index 2).
Average cloud cover in December
Saint Helier, Jersey
- Average cloud cover in December: 61
The months with the most cloud cover are January, November and December (Cloud cover 61).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility in December
Saint Helier, Jersey
- Average visibility in December: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Saint Helier, Jersey
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