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Glossary Science & Engineering

Dew point

The dew point is the temperature to which air must cool for water vapour to condense into dew; the higher it is, the muggier the air feels.

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In more detail

Air at 25 °C and 60% humidity has a dew point of about 16.7 °C. Below roughly 13 °C (55 °F) the air feels dry or comfortable; above about 21 °C (70 °F) it feels oppressive.

Try these tools

Dew Point Calculator

Calculate the dew point from air temperature and relative humidity using the Magnus formula, and see how muggy it will actually feel.

See also

  • Glossary Heat index
    The heat index is the "feels like" temperature that combines air temperature and relative humidity to show how hot it seems to the body.
  • Cheat sheet Weather Formulas Cheat Sheet
    The heat index, wind chill and dew point formulas with their valid ranges, plus °C/°F conversion.
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