Answer:
-89.2'C (-128.6'F) at the Russian Antarctic station, Vostok, in 1983.
The Australian Antarctic Territory (AAT) experienced the world's lowest temperature when -89.6 degrees Celsius (-129F) was recorded on 21st July, 1983, at Russia's Vostok Station at an elevation of 3,488 metres.
The coldest temperatures in the interior range from -400 to -940 C and on the coast -50 to -220 C.