In the United States, the hottest day that we know of was July 10, 1913. On that day, Death Valley, California, reached 134 degrees Fahrenheit (56 degrees Celsius). The highest temperature in the world was recorded on September 13, 1922 in Al Aziziyah, Libya, where it reached 136.4 degrees Fahrenheit (58 degrees Celsius).
The coldest temperature ever measured was –129 Fahrenheit (–89 Celsius) at Vostok, Antarctica, on July 21, 1983. The world’s most extreme temperatures take place in Verhoyansk, northeast Siberia, where temperatures fall as low as –90 degrees Fahrenheit (–68 degrees Celsius) in winter and rise as high as 98 degrees Fahrenheit (37 degrees Celsius) in summer.