What's the dew point, and how does it relate to humidity?

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by Jeff Renner

Bio | Email | Follow: @Jeffrennerwx

KING5.com

Posted on October 20, 2009 at 1:19 PM

Updated Thursday, Jan 14 at 9:20 AM

What's the dew point, and how does it relate to humidity?

The dew point is a measure of moisture in the air; the higher the dew point, the more moisture...and it's expressed as a temperature. That's because it tells meteorologists (and everyone) that if the air temperature cools to that temperature (the dew point), the air will become saturated and clouds or fog may form. Humidity is simply a measure of how close the air temperature is to the dewpoint; the higher the humidity, the closer they are to each other, and clouds or fog are more likely to develop.

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