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SESK: Stuff Everyone Should Know · sesk.info/aero-dew-point

What is the dew point?

The temperature where air becomes saturated and water starts to condense.

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  1. The temperature where water boils
  2. The point where rain hits the ground
  3. The temperature where air becomes saturated with water vapor ✔

Why: The dew point is the temperature where air becomes saturated, or reaches 100 percent relative humidity. Further cooling can make water vapor condense into dew, fog, or clouds.

Huh, didn't know that: When temperature and dew point are close together, watch for fog or low clouds.

The dad joke
What did the grass say to the morning dew? You are always dropping by.
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References

Answer: The temperature where air becomes saturated with water vapor. The dew point is the temperature where air becomes saturated, or reaches 100 percent relative humidity. Further cooling can make water vapor condense into dew, fog, or clouds.

  1. National Weather Service La Crosse: Dew Point vs Humidity www.weather.gov/arx/why_dewpoint_vs_humidity
    the temperature the air needs to be cooled to (at constant pressure) in order to achieve a relative humidity (RH) of 100%.
    Checked 2026-10-10.

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