A temperature scale in which the melting point of water is 0 degrees and the boiling point is 100 degrees C. 100 degrees C is equal to 212 degrees Fahrenheit. To convert Fahrenheit to Centigrade: C degrees x9/5+32. Russian researchers at the Vostok Base, Antarctica report the lowest temperature found on Earth, -128.6 degrees Fahrenheit (89.2 C).