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NEGATIVE TEMPERATURE AND DEWPOINT

METEOROLOGIST JEFF HABY

The Fahrenheit and Celsius temperature scales can have negative values since they are not absolute temperature scales (0 on scale is not coldest possible temperature). 0 Celsius is freezing point of water thus any temperature below the freezing point of water will be negative. 0 Fahrenheit is very cold but temperatures can drop even colder to negative values. Dewpoint values can be negative for the same reason temperatures can be negative. If the Kelvin temperature scale is used then the values will not be negative since 0 K is the coldest temperature possible.