December weather forecast and climate
Saint Helier, Jersey

A shot of the Elizabeth Castle found on Tidal Island in Saint Helier Parish, Jersey
A shot of the Elizabeth Castle found on Tidal Island in Saint Helier Parish, Jersey

Temperature

In Saint Helier, in December, the average high-temperature is 10.4°C (50.7°F), and the average low-temperature is 5.5°C (41.9°F).

Rainfall

December is the month with the most rainfall. Rain falls for 19.5 days and accumulates 110.5mm (4.4") of precipitation.

Sea temperature

In Saint Helier, the average seawater temperature in December is 11°C (51.8°F). Swimming in 11°C (51.8°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

With an average of 8.3h of daylight, December has the shortest days of the year in Saint Helier.

Sunshine

Months with the least sunshine are January and December, with an average of 2h of sunshine.

UV index

Months with the lowest UV index are January, November and December, with an average UV index of 1.

What is the temperature in December in Saint Helier?

The average high-temperature, in December, is 10.4°C (50.7°F), while the average low-temperature is 5.5°C (41.9°F).

How many days does it rain in December in Saint Helier?

In December, in Saint Helier, the rain falls for 19.5 days. Throughout December, 110.5mm (4.4") of precipitation is accumulated.

What is the rainiest month in Saint Helier?

The month with the most rainfall in Saint Helier, Jersey, is December when the rain falls for 19.5 days and typically aggregates up to 110.5mm (4.4") of precipitation.

What is the sea water temperature in December in Saint Helier?

In December, the average sea temperature in Saint Helier, Jersey, is 11°C (51.8°F). Swimming in 11°C (51.8°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the month with the shortest days in Saint Helier?

With an average of 8.3h of daylight, December has the shortest days of the year.

What is the average length of the day in December in Saint Helier?

The average length of the day in December is 8.3h.

What is the month with the least sunshine in Saint Helier?

January and December, with an average of 2h of sunshine, are months with the least sunshine in Saint Helier.

How many hours of sunshine does Saint Helier have in December?

In December, the average sunshine in Saint Helier, Jersey, is 2h.

What are the months with the lowest UV index in Saint Helier?

January, November and December, with an average UV index of 1, are months with the lowest UV index in Saint Helier, Jersey.

How high is the UV index in December in Saint Helier?

In Saint Helier, Jersey, the average UV index in December is 1.
Average temperature in December - Saint Helier, Jersey
  • Average high temperature in December: 10.4°C

The warmest month (with the highest average high temperature) is August (21.2°C).
The month with the lowest average high temperature is January (9.5°C).

  • Average low temperature in December: 5.5°C

The month with the highest average low temperature is August (14.4°C).
The coldest month (with the lowest average low temperature) is February (4°C).

Average rainfall in December - Saint Helier, Jersey
  • Average rainfall in December: 110.5mm

The wettest month (with the highest rainfall) is December (110.5mm).
The driest month (with the lowest rainfall) is July (37mm).

Average rainfall days in December - Saint Helier, Jersey
  • Average rainfall days in December: 19.5 days

The month with the highest number of rainy days is December (19.5 days).
The month with the lowest number of rainy days is July (9.9 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).
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: 8.3h

The month with the longest days is June (Average daylight: 16.2h).
The month with shortest days is December (Average daylight: 8.3h).

  • Average sunshine in December: 2h

Months with most sunshine are May, June, July and August (Average sunshine: 8h).
Months with least sunshine are January and December (Average sunshine: 2).

Average UV index in December - Saint Helier, Jersey
  • Average UV index in December: 1

Months with the highest UV index are June and July (UV index 7).
Months with the lowest UV index are January, November and December (UV index 1).

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