The Poles of Cold are the places in the southern and northern hemispheres where the lowest air temperatures have been recorded.
Southern hemisphere
In the southern hemisphere, the Pole of Cold is currently located in Antarctica, at the Russian Antarctic station Vostok at. On July 21, 1983, this station recorded a temperature of. This is the lowest naturally occurring temperature ever recorded on Earth. Vostok station is located at the elevation of above sea level, far removed from the moderating influence of oceans, and high latitude that results in almost three months of civil polar night every year, all combine to produce an environment where temperatures rarely rise above during summer and frequently fall below in winter. By comparison, the South Pole, due to its lower elevation, is, on average, warmer than Vostok, and the lowest temperature ever recorded at the South Pole is. It is generally thought that Vostok is not the coldest place in Antarctica, and there are locations that are modestly colder on average. The now inactive Plateau Station, located on the central Antarctic plateau, recorded an average yearly temperature that was consistently lower than that of Vostok Station during the 37-month period that it was active in the late 1960s, with its average for the coldest month being several degrees lower than the same statistic for Vostok. Plateau Station never recorded a temperature that surpassed the record low set at Vostok. However, temperatures at Plateau Station were only recorded during the 37 months that it was active. Had a lower temperature than the Vostok record occurred there at a later date, it would never have been recorded. Monitoring stations in Antarctica are few and far between; prior to 1995, Vostok was the only research station on the Antarctic Plateau above the elevation of 3,000 m, with no other stations for several hundred kilometers in any direction. Temperatures below, if they did occur elsewhere, would not have been recorded. The automatic weather station at Dome A was only installed in 2005, and has recorded as the coldest so far. However a review of satellite measurements taken between 2010–2013 found several places located along a ridge between Dome A and Dome F which recorded even lower temperatures of, with the lowest reliable temperature being recorded in 2010, at, at an elevation of. The extreme low temperatures are found in hollows slightly below the peak of the ice ridge, where cold air gets trapped as it flows downhill, and since the same low temperature ranges were detected at several different sites along the ridge across multiple years, it is thought this may be the lowest temperature achievable under local atmospheric conditions.
Northern hemisphere
In the northern hemisphere, there are two places in the Sakha, Russia that vie for the honour of being considered the "Pole of Cold" in winter. These are Verkhoyansk and Oymyakon. In December 1868 and then in February 1869 :ru:Худяков, Иван Александрович|Ivan Khudyakov made the discovery of the Northern Pole of Cold by measuring a record temperature of in Verkhoyansk. Later, on January 15, 1885, a temperature of was registered there by :ru:Ковалик, Сергей Филиппович|Sergey Kovalik. This measurement was published in the Annals of the General Physical Observatory in 1892; by mistake it was written as, which was later corrected. One can still find this incorrect value in some literature. The coldest reliably measured temperature in Verkhoyansk was on February 5 and 7 of 1892. On February 6, 1933, a temperature of was recorded at Oymyakon's weather station. This is the coldest reliably measured temperature for the Northern Hemisphere. The weather station is in a valley between Oymyakon and Tomtor. The station is at and the surrounding mountains at, causing cold air to pool in the valley: recent studies show that winter temperatures in the area increase with elevation by as much as. The average temperature in Oymyakon has risen about 2.7 degrees Celsius since preindustrial times.
