page_title: South Georgia and the South Sandwich Islands
section_title: Climate
hierarchical_section_title: South Georgia and the South Sandwich Islands / Climate
caption_attribution_description: English: This is a true-color satellite image of South Georgia Island.
context_page_description: South Georgia and the South Sandwich Islands is a British Overseas Territory in the southern Atlantic Ocean. It is a remote and inhospitable collection of islands, consisting of South Georgia and a chain of smaller islands known as the South Sandwich Islands. South Georgia is 165 kilometres long and 35 kilometres wide and is by far the largest island in the territory. The South Sandwich Islands lie about 700 kilometres southeast of South Georgia. The territory's total land area is 3,903 km². The Falkland Islands are about 1,300 kilometres west-northwest from its nearest point.
  No permanent native population lives in the South Sandwich Islands, and a very small non-permanent population resides on South Georgia. There are no scheduled passenger flights or ferries to or from the territory, although visits by cruise liners to South Georgia are increasingly popular, with several thousand visitors each summer.
  The United Kingdom claimed sovereignty over South Georgia in 1775 and the South Sandwich Islands in 1908. The territory of "South Georgia and the South Sandwich Islands" was formed in 1985; previously, it had been governed as part of the Falkland Islands Dependencies.
context_section_description: The climate is classified as polar, and the weather is highly variable and harsh; making a tundra (ET) in Köppen climate classification. Typical daily maximum temperatures in South Georgia at sea level are around 0 °C (32 °F) in winter (August) and 8 °C (46.4 °F) in summer (January). Winter minimum temperatures are typically about −5 °C (23 °F) and rarely dip below −10 °C (14 °F). Annual precipitation in South Georgia is about 1,500 mm (59.1 in), much of which falls as sleet or snow, which is possible the entire year. Inland, the snow line in summer is at an altitude of about 300 m (984 ft).
  Westerly winds blow throughout the year interspersed with periods of calm—indeed, in 1963, 25% of winds were in the calm category at King Edward point, and the mean wind speed of around 8 knots (9.2 mph; 15 km/h) is around half that of the Falkland Islands. This gives the eastern side of South Georgia (leeward side) a more pleasant climate than the exposed western side. The prevailing weather conditions generally make the islands difficult to approach by ship, though the north coast of South Georgia has several large bays which provide good anchorage.
  Sunshine, as with many South Atlantic Islands, is low, at a maximum of just 21.5%. This amounts to around 1,000 hours of sunshine annually. The local topography, however, also contributes significantly to the low insolation. A study published during the early 1960s indicated that sunshine recording instruments remained significantly obscured throughout the year and entirely obscured during June. It was estimated that the theoretical sunshine exposure minus obstructions would be around 14% at Bird Island and 35% at King Edward Point – or, in hourly terms, ranging from around 650 hours in the west to 1,500 hours in the east. This illustrates the effect the Allardyce range has in breaking up cloud cover.
  Mountain winds blow straight up the western side and straight down the eastern side of the mountains and become much warmer and drier due to the Föhn effect; this produces the most pleasant conditions when temperatures can occasionally rise over 20 °C (68 °F) on summer days. The highest recorded temperature was 28.8 °C (83.8 °F) at Grytviken. and 26.3 °C (79.3 °F) at nearby King Edward point, both on the sheltered east side of the Islands. Conversely, the highest recorded temperature at Bird Island on the windward western side is a mere 14.5 °C (58.1 °F). As one might expect, the sheltered eastern side can also record lower winter temperatures—the absolute minimum for Grytviken being −19.4 °C (−2.9 °F), King Edward Point −18.9 °C (−2.0 °F), but Bird Island just −11.4 °C (11.5 °F).
  The seas surrounding South Georgia are cold throughout the year due to the proximity of the Antarctic Circumpolar Current. They usually remain free of pack ice in winter, though thin ice may form in sheltered bays, and icebergs are common. Sea temperatures drop to 0 °C (32 °F) in late August and rise to around 4 °C (39.2 °F) only in early April.
  The South Sandwich Islands are much colder than South Georgia, being farther south and more exposed to cold outbreaks from the Antarctic continent. They are also surrounded by sea ice from the middle of May to late November (even longer at their southern end). Recorded temperature extremes at South Thule Island have ranged from −29.8 to 17.7 °C (−21.6 to 63.9 °F).
caption: NASA satellite image of South Georgia Island covered with snow
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