Relative humidity measures how much moisture is in the air compared to how much it could hold at a given temperature. It is simply the dew point temperature divided by the air temperature, times 100.

Fort Collins is under a red flag warning on Feb. 9, a sign of increased fire risk. Residents are advised to avoid outdoor ...

The Canton area should see a considerable drop in humidity Wednesday, as relative humidity percentages are expected to fall to the 50s. A high relative humidity percentage results in an increased heat ...

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CHICAGO — Hot, steamy air blowing into Illinois from a heat dome moving east across the country has kicked off at least a week of dangerous heat, with humidity peaking Saturday through Monday. These ...