Relative humidity is calculated using meteorological variables such as vapor pressure, saturation vapor pressure, temperature and dew point. Without explaining the equation variable by variable, we can simply state that the relative humidity is determined by how close the air temperature is to the dew point temperature. The closer these values are, the higher the humidity. The further apart these values are, the lower the humidity.
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Dew point is the term that most meteorologists use to describe the amount of moisture in the air. The National Weather Service defines dew point as the temperature to which air must be cooled to in order to reach saturation, assuming air pressure and moisture content are constant. In short, the dew point is an accurate measurement of the moisture content in the air. When talking about a certain day feeling "muggy" or "sticky," the dew point temperature is the more accurate term to use.