Longyearbyen
Svalbard and Jan Mayen
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Longyearbyen, Svalbard and Jan Mayen

The frozen Arctic Blue Sea overlooking the snow-covered mountains in the background, on a sunny winter morning, in Longyearbyen, Svalbard and Jan Mayen
The frozen Arctic Blue Sea overlooking the snow-covered mountains in the background, on a sunny winter morning, in Longyearbyen, Svalbard and Jan Mayen

Rainfall

In Longyearbyen, Svalbard and Jan Mayen, during December, the rain falls for 3 days and regularly aggregates up to 25mm (0.98") of precipitation. In Longyearbyen, during the entire year, the rain falls for 86 days and collects up to 271mm (10.67") of precipitation.

Snowfall

January through December are months with snowfall. Months with the most snowfall days in Longyearbyen are November and December, with an average of 22 snowfall days.

Sea temperature

In December, the average sea temperature in Longyearbyen is 2°C (35.6°F).
Note: For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. A specialized swimsuit is mandatory to reduce thermal damage.

Daylight

January, November and December, with an average of 0h of daylight, are months with the shortest days in Longyearbyen.

Sunshine

Months with the least sunshine are January, February, November and December, with an average of 0h of sunshine.

UV index

Months with the lowest UV index in Longyearbyen are January through March, October through December, with an average maximum UV index of 0. A UV Index of 2, and less, symbolizes a low threat to health from the exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 0 transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

How much does it rain in Longyearbyen in December?

In Longyearbyen, Svalbard and Jan Mayen, during December, the rain falls for 3 days and regularly aggregates up to 25mm (0.98") of precipitation.

How many days does it snow in December in Longyearbyen?

In December, snow falls for 22 days.

When does it snow the most in Longyearbyen?

Months with the most snowfall days in Longyearbyen, Svalbard and Jan Mayen, are November and December, with an average of 22 snowfall days.

What is the sea temperature in December in Longyearbyen?

In Longyearbyen, the average seawater temperature in December is 2°C (35.6°F). For swimming, this is considered very dangerous and immediately life-threatening. Total loss of breathing control instantly occurs, and clear thinking becomes almost impossible. A specialized swimsuit is obligatory to minimize thermal loss.

What is the month with the shortest days in Longyearbyen?

January, November and December, with an average of 0h of daylight, are months with the shortest days in Longyearbyen.

What is the average length of the day in December in Longyearbyen?

In December, the average length of the day in Longyearbyen is 0h.

What is the month with the least sunshine in Longyearbyen?

Months with the least sunshine in Longyearbyen are January, February, November and December, with an average of 0h of sunshine.

How long on average sun shines in December in Longyearbyen?

In December, the average sunshine in Longyearbyen is 0h.

What is the month with the lowest UV index in Longyearbyen?

January through March, October through December, with an average maximum UV index of 0, are months with the lowest UV index in Longyearbyen, Svalbard and Jan Mayen.

What is the UV index reading in December in Longyearbyen?

In December, the average daily maximum UV index in Longyearbyen, Svalbard and Jan Mayen, is 0. A UV Index estimate of 2, and below, represents a minimal health vulnerability from the exposure to the Sun's UV radiation.
Average rainfall in December - Longyearbyen, Svalbard and Jan Mayen
  • Average rainfall in December: 25mm

The wettest month (with the highest rainfall) is August (30mm).
The driest month (with the lowest rainfall) is May (13mm).

Average rainfall days in December - Longyearbyen, Svalbard and Jan Mayen
  • Average rainfall days in December: 3 days

The month with the highest number of rainy days is August (18 days).
Months with the lowest number of rainy days are January, February and March (2 days).

Average snowfall days in December - Longyearbyen, Svalbard and Jan Mayen
  • Average snowfall days in December: 22 days

Months with the highest number of snowfall days are November and December (22 days).
The month with the lowest number of snowfall days is July (1 days).

Average sea temperature in December - Longyearbyen, Svalbard and Jan Mayen
  • Average sea temperature in December: 2°C

The best month for swimming (with the highest average sea temperature) is August (6°C).
Coldest months (with the lowest average sea temperature) are February and April (1°C).

Average daylight in December / Average sunshine in December - Longyearbyen, Svalbard and Jan Mayen
  • Average daylight in December: 0h

Months with the longest days are May, June and July (Average daylight: 24h).
Months with shortest days are January, November and December (Average daylight: 0h).

  • Average sunshine in December: 0h

The month with most sunshine is May (Average sunshine: 8.2h).
Months with least sunshine are January, February, November and December (Average sunshine: 0).

Average UV index in December - Longyearbyen, Svalbard and Jan Mayen
  • Average UV index in December: 0

Months with the highest UV index are May, June and July (UV index 2).
Months with the lowest UV index are January, February, March, October, November and December (UV index 0).