Relative humidity might not accurately reflect personal comfort because of the influence of temperature and pressure. A cool day with high relative humidity may feel comfortable, while a hot day with similar or even lower humidity levels can feel uncomfortable. The dew point temperature—that is, the temperature at which the atmosphere is saturated with water vapor—is a better indicator of how comfortable the air will be. The air typically begins to feel uncomfortable on warm days when temperatures surpass about 21 °C (70 °F) and dew points increase to match them.
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