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
December
Weather in December
Temperature
Transitioning into December, Grytviken records an average high-temperature of a still icy 1.9°C (35.4°F), almost identical to November's 1.2°C (34.2°F). In Grytviken, the nighttime temperature in December descends gently to an average of -0.1°C (31.8°F).Humidity
In Grytviken, the average relative humidity in December is 90%.Rainfall
In Grytviken, during December, the rain falls for 17.8 days and regularly aggregates up to 94mm (3.7") of precipitation. In Grytviken, during the entire year, the rain falls for 168.8 days and collects up to 1190mm (46.85") of precipitation.Snowfall
January through December are months with snowfall. In Grytviken, in December, snow falls for 16.5 days, with typically accumulated 184mm (7.24") of snow. In Grytviken, during the entire year, snow falls for 193 days and aggregates up to 3130mm (123.23") of snow.Sea temperature
In Grytviken, South Georgia and the South Sandwich Islands, the average seawater temperature in December is 2°C (35.6°F).Note: In the case of swimming, this is seriously cold, dangerous, and can result in death. Without the safeguard of insulated waterproof attire, hypothermia manifests rapidly.
Daylight
December has the longest days of the year, with an average of 17h and 6min of daylight.On the first day of the month, sunrise is at 03:51 and sunset at 20:39. On the last day of December, sunrise is at 03:56 and sunset at 21:02 -02.
Sunshine
In December, the average sunshine is 5.3h.UV index
January through December, with an average maximum UV index of 1, are months with the highest UV index. January through December, with an average maximum UV index of 1, are months with the lowest UV index in Grytviken. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the average person.Note: The daily high UV index of 1 in December translates into this advice:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
How much does it rain in December?
How much does it snow in Grytviken in December?
How cold is the water in December?
When are the longest days?
What is the average length of the day in December?
What time are sunrise and sunset in December?
How long on average sun shines in December?
What is the month with the highest UV index?
When is the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Grytviken, South Georgia and the South Sandwich Islands
- Average high temperature in December: 1.9°C
The warmest month (with the highest average high temperature) is February (3.1°C).
The month with the lowest average high temperature is August (-1.6°C).
- Average low temperature in December: -0.1°C
The month with the highest average low temperature is February (1°C).
The coldest month (with the lowest average low temperature) is August (-4.9°C).
Average pressure in December
Grytviken, South Georgia and the South Sandwich Islands
- Average pressure in December: 992.9mbar
The month with the highest atmospheric pressure is September (1002.1mbar).
The month with the lowest atmospheric pressure is December (992.9mbar).
Average wind speed in December
Grytviken, South Georgia and the South Sandwich Islands
- Average wind speed in December: 23.5km/h
The windiest month (with the highest average wind speed) is September (25.7km/h).
The calmest month (with the lowest average wind speed) is December (23.5km/h).
Average humidity in December
Grytviken, South Georgia and the South Sandwich Islands
- Average humidity in December: 90%
The months with the highest relative humidity are January and February (91%).
The months with the lowest relative humidity are July and August (87%).
Average rainfall in December
Grytviken, South Georgia and the South Sandwich Islands
- Average rainfall in December: 94mm
The wettest month (with the highest rainfall) is April (114mm).
The driest month (with the least rainfall) is October (82mm).
Average rainfall days in December
Grytviken, South Georgia and the South Sandwich Islands
- Average rainfall days in December: 17.8 days
The month with the highest number of rainy days is March (20.5 days).
The month with the least rainy days is August (7.8 days).
Average snowfall in December
Grytviken, South Georgia and the South Sandwich Islands
- Average snowfall in December: 184mm
The month with the highest snowfall is August (421mm).
The month with the least snowfall is March (125mm).
Average snowfall days in December
Grytviken, South Georgia and the South Sandwich Islands
- Average snowfall days in December: 16.5 days
The month with the highest number of snowfall days is August (19 days).
The month with the least snowfall days is February (11.7 days).
Average sea temperature in December
Grytviken, South Georgia and the South Sandwich Islands
- Average sea temperature in December: 2°C
The best months for swimming (with the highest average sea temperature) are January, February, March and April (3°C).
The 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: 17h and 1min
The month with the longest days is December (Average daylight: 17h and 6min).
The month with the shortest days is June (Average daylight: 7h and 24min).
- Average sunshine in December: 5h and 2min
The month with the most sunshine is October (Average sunshine: 5h and 48min).
The month with the least sunshine is August (Average sunshine: 3h and 0min).
Average sunshine days in December
Grytviken, South Georgia and the South Sandwich Islands
- Average sunshine days in December: 2.2 days
The months with the most sunshine days are September and November (4 days).
The month with the least sunshine days is January (1.1 days).
Average UV index in December
Grytviken, South Georgia and the South Sandwich Islands
- Average UV index in December: 1
The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 1).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 1).
Average cloud cover in December
Grytviken, South Georgia and the South Sandwich Islands
- Average cloud cover in December: 71
The month with the most cloud cover is January (Cloud cover 73).
The month with the least cloud cover is October (Cloud cover 66).
Average visibility in December
Grytviken, South Georgia and the South Sandwich Islands
- Average visibility in December: 8km
The months with the highest visibility are January, February, March, April, May, June, October, November and December (8km).
The months with the lowest visibility are July, August and September (7km).
