Saint Peter Port
Guernsey
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Saint Peter Port, Guernsey

A calm sunny day in Saint Peter Port, Guernsey, with ships docked at the harbor, and a clear skyline in the horizon
A calm sunny day in Saint Peter Port, Guernsey, with ships docked at the harbor, and a clear skyline in the horizon
The first month of the winter, December, is also a fresh month in Saint Peter Port, Guernsey, with average temperature ranging between min 6°C (42.8°F) and max 10°C (50°F).

Temperature

In December, the average high-temperature is practically the same as in November - a still cool 10°C (50°F). The average low-temperature, in Saint Peter Port, is 6°C (42.8°F).

Rainfall

December is the month with the most rainfall. Rain falls for 19 days and accumulates 100mm (3.9") of precipitation.

Sea temperature

In December, the average sea temperature in Saint Peter Port, Guernsey, is 11°C (51.8°F).
Note: 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.

Daylight

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

Sunshine

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

UV index

January, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from the exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 1 interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in December in Saint Peter Port?

In Saint Peter Port, Guernsey, in December, the average high-temperature is 10°C (50°F), and the average low-temperature is 6°C (42.8°F).

How many days does it rain in December in Saint Peter Port?

In December, the rain falls for 19 days. Throughout December, 100mm (3.9") of precipitation is accumulated.

What is the rainiest month in Saint Peter Port?

December is the month with the most rainfall. Rain falls for 19 days and accumulates 100mm (3.9") of precipitation.

How cold is the water in December in Saint Peter Port?

In Saint Peter Port, Guernsey, in December, the average water temperature is 11°C (51.8°F). At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

What is the month with the shortest days in Saint Peter Port?

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

What is the average length of the day in December in Saint Peter Port?

In Saint Peter Port, the average length of the day in December is 8.3h.

What is the month with the least sunshine in Saint Peter Port?

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

How long on average sun shines in December in Saint Peter Port?

In Saint Peter Port, Guernsey, the average sunshine in December is 2h.

What are the months with the lowest UV index in Saint Peter Port?

Months with the lowest UV index in Saint Peter Port are January, November and December, with an average maximum UV index of 1.

What is the UV index reading in December in Saint Peter Port?

The average daily maximum UV index in December in Saint Peter Port, Guernsey, is 1. A UV Index value of 2, and less, symbolizes a low health threat from the exposure to the Sun's UV rays.
Average temperature in December - Saint Peter Port, Guernsey
  • Average high temperature in December: 10°C

The warmest month (with the highest average high temperature) is August (20°C).
The month with the lowest average high temperature is February (8°C).

  • Average low temperature in December: 6°C

The month with the highest average low temperature is August (14°C).
The coldest month (with the lowest average low temperature) is February (4°C).

Average rainfall in December - Saint Peter Port, Guernsey
  • Average rainfall in December: 100mm

The wettest month (with the highest rainfall) is December (100mm).
The driest month (with the lowest rainfall) is July (37mm).

Average rainfall days in December - Saint Peter Port, Guernsey
  • Average rainfall days in December: 19 days

The month with the highest number of rainy days is January (20 days).
The month with the lowest number of rainy days is July (10 days).

Average sea temperature in December - Saint Peter Port, Guernsey
  • 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 Peter Port, Guernsey
  • 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 and July (Average sunshine: 8h).
Months with least sunshine are January, November and December (Average sunshine: 2).

Average UV index in December - Saint Peter Port, Guernsey
  • 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).