The highest temperature in the world was 136° Fahrenheit (58° Celsius), recorded at El Azizia, Libya, on the edge of the Sahara Desert, on September 13, 1922. The highest temperature ever recorded in the United States was 134° Fahrenheit (56.7° Celsius) in Death Valley, California, on July 10, 1913. The unofficial high temperature, which does not meet the international weather standards, was 140° Fahrenheit (60° Celsius). This was recorded at Delta, Mexico, in August 1953. Another unofficial high of 136.4° Fahrenheit (58° Celsius) was recorded at San Luis, Mexico, on August 11, 1933.
The lowest temperature on record is -128.6° Fahrenheit (-89.6° Celsius), measured at Vostok Station in Antarctica on July 21, 1983. The record cold temperature for an inhabited area was -90.4° Fahrenheit (-68° Celsius) at Oymyakon, Siberia (population 4,000), on February 6, 1933. This temperature is the same as the readings at Verkhoyansk, Siberia, on January 3, 1885, and February 5 and 7, 1892. The lowest temperature reading in the United States was -79.8° Fahrenheit (-62.1° Celsius) on January 23, 1971, in Prospect Creek, Alaska. For the contiguous 48 states (the continental United States, which excludes Alaska and Hawaii), the coldest temperature was -69.7° Fahrenheit (-56.5° Celsius) at Rogers Pass, Montana, on January 20, 1954.
Sources: Ahrens, C. Donald. Meteorology Today: An Introduction to Weather, Climate, and the ronment, 5th ed., p. 505; The Guinness Book of Records 1995, pp. 63-64.