Celsius
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Celsius is a temperature scale in the metric system. The scale was originally defined such that at standard atmospheric pressure water freezes at 0 ºC and boils at 100 ºC. To convert from fahrenheit to celsius take the fahrenheit temperature, subtract 32 then multiply by 5 and divide by 9.
One Celsius degree is equal to one Kelvin degree, with an offset such that T(°C) = T(K) - 273,15
Celsius is the commonly used unit of temperature in Europe, but in the United States, fahrenheit is still preferred.