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What's the difference between dew point and relative humidity? A meteorologists explains.
PITTSBURGH (KDKA) — Oftentimes in weathercasts, you'll hear KDKA-TV's First Alert meteorologists mention the relative humidity and dew point, but what are these two terms and what do they mean?
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Dew point
The dew point is the temperature the air needs to be cooled to in order to achieve a relative humidity (RH) of 100%. The higher the dew point rises, the greater the amount of moisture in the air.