Grytviken
South Georgia and the South Sandwich Islands
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Grytviken, South Georgia and the South Sandwich Islands

December, the first month of the summer, in Grytviken, is also a frosty month, with average temperature fluctuating between 0.4°C (32.7°F) and 7.5°C (45.5°F).

Temperature

In Grytviken, South Georgia and the South Sandwich Islands, the average high-temperature is practically the same as in November - a still chilly 7.5°C (45.5°F). In December, the average low-temperature is 0.4°C (32.7°F).

Rainfall

In December, in Grytviken, the rain falls for 16 days. Throughout December, 88mm (3.5") of precipitation is accumulated. In Grytviken, during the entire year, the rain falls for 205 days and collects up to 1404mm (55.3") of precipitation.

Sea temperature

In Grytviken, the average seawater temperature is 2°C (35.6°F).
Note: For swimming, this is considered extremely cold, dangerous, and life-threatening. Unless suitably protected with insulated waterproof clothing, hypothermia quickly occurs.

Daylight

December has the longest days of the year, with an average of 17.1h of daylight.

Sunshine

In December, the average sunshine is 5.4h.

UV index

With an average maximum UV index of 8, December is the month with the highest UV index. A UV Index value of 8 to 10 symbolizes a very high threat to health from the exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 8 in December interpret into the following advice:
Take extra precautions. Protection against sun damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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.

What is the temperature in December in Grytviken?

In Grytviken, in December, the average high-temperature is 7.5°C (45.5°F), and the average low-temperature is 0.4°C (32.7°F).

How many days does it rain in December in Grytviken?

In Grytviken, South Georgia and the South Sandwich Islands, during December, the rain falls for 16 days and regularly aggregates up to 88mm (3.5") of precipitation.

What is the water temperature in December in Grytviken?

In Grytviken, South Georgia and the South Sandwich Islands, the average seawater temperature in December is 2°C (35.6°F). For swimming, this is considered extremely cold, dangerous, and life-threatening. Unless suitably protected with insulated waterproof clothing, hypothermia quickly occurs.

When are the longest days in Grytviken?

December has the longest days of the year, with an average of 17.1h of daylight.

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

The average length of the day in December in Grytviken is 17.1h.

How long on average sun shines in December in Grytviken?

In December, the average sunshine in Grytviken, South Georgia and the South Sandwich Islands, is 5.4h.

When is the highest UV index in Grytviken?

With an average maximum UV index of 8, December is the month with the highest UV index in Grytviken, South Georgia and the South Sandwich Islands.

How high is the UV index in December in Grytviken?

The average daily maximum UV index in December in Grytviken is 8. A UV Index of 8 to 10 symbolizes a very high health risk from unsafe exposure to the Sun's UV rays.
Average temperature in December - Grytviken, South Georgia and the South Sandwich Islands
  • Average high temperature in December: 7.5°C

The warmest month (with the highest average high temperature) is February (9.1°C).
The month with the lowest average high temperature is June (0.9°C).

  • Average low temperature in December: 0.4°C

The month with the highest average low temperature is February (1.7°C).
The coldest month (with the lowest average low temperature) is August (-4.9°C).

Average rainfall in December - Grytviken, South Georgia and the South Sandwich Islands
  • Average rainfall in December: 88mm

Wettest months (with the highest rainfall) are July and August (149mm).
The driest month (with the lowest rainfall) is October (80mm).

Average rainfall days in December - Grytviken, South Georgia and the South Sandwich Islands
  • Average rainfall days in December: 16 days

The month with the highest number of rainy days is April (19 days).
The month with the lowest number of rainy days is August (15 days).

Average sea temperature in December - Grytviken, South Georgia and the South Sandwich Islands
  • Average sea temperature in December: 2°C

Best months for swimming (with the highest average sea temperature) are January, February, March and April (3°C).
Coldest months (with the lowest average sea temperature) are August, September and October (0°C).

Average daylight in December / Average sunshine in December - Grytviken, South Georgia and the South Sandwich Islands
  • Average daylight in December: 17.1h

The month with the longest days is December (Average daylight: 17.1h).
The month with shortest days is June (Average daylight: 7.4h).

  • Average sunshine in December: 5.4h

The month with most sunshine is November (Average sunshine: 5.8h).
The month with least sunshine is June (Average sunshine: 0.4h).

Average UV index in December - Grytviken, South Georgia and the South Sandwich Islands
  • Average UV index in December: 8

The month with the highest UV index is December (UV index 8).
Months with the lowest UV index are June and July (UV index 0).