South Pole
In midsummer, as the sun reaches its maximum elevation of about 23.5 degrees, high temperatures at the South Pole in January average at . As the six-month "day" wears on and the sun gets lower, temperatures drop as well: they reach around sunset (late March) and sunrise (late September). In midwinter, the average temperature remains steady at around . The highest temperature ever recorded at the Amundsen–Scott South Pole Station was on Christmas Day, 2011, and the lowest was on June 23, 1982 (for comparison, the lowest temperature directly recorded anywhere on earth was at Vostok Station on July 21, 1983, though was measured indirectly by satellite in East Antarctica between Dome A and Dome F in August 2010). Mean annual temperature at the South Pole is -49.3 °C (-56.7 °F).
Geography of Russia
In winter, an intense high-pressure system causes winds to blow from the south and the southwest in all but the Pacific region of the Russian landmass; in summer, a low-pressure system brings winds from the north and the northwest to most of the landmass. Russia is the coldest country of the world (average annual temperature is ). That meteorological combination reduces the wintertime temperature difference between north and south. Thus, average January temperatures are in Saint Petersburg, in the West Siberian Plain, and at Yakutsk (in east-central Siberia, at approximately the same latitude as Saint Petersburg), while the winter average on the Mongolian border, whose latitude is some 10° farther south, is barely warmer. Summer temperatures are more affected by latitude, however; the Arctic islands average , and the southernmost regions average . Russia's potential for temperature extremes is typified by the national record low of , recorded at Verkhoyansk in north-central Siberia and the record high of , recorded at several southern stations (Utta).