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Dew point is the temperature at which air becomes saturated with water vapor, causing dew to form. It’s a more accurate measure of humidity comfort than relative humidity because it indicates the actual moisture content in the air. Higher dew points make it feel more humid and uncomfortable, while lower dew points feel drier and more comfortable.

Dew point directly affects how comfortable you feel. A dew point below 10°C feels dry and comfortable. Between 10-16°C feels pleasant. 16-21°C feels increasingly humid. 21-26°C feels very uncomfortable and oppressive. Above 26°C feels extremely miserable and can be dangerous for prolonged exposure. Unlike relative humidity, dew point provides a consistent measure of comfort regardless of air temperature.

Relative humidity is the percentage of moisture in the air compared to the maximum amount it can hold at a given temperature. Dew point is the temperature at which the air would become saturated if cooled at constant pressure. While relative humidity changes with temperature, dew point remains constant unless the actual moisture content changes. Dew point is generally considered a better indicator of comfort than relative humidity.

Dew point is calculated using temperature and relative humidity measurements. Several formulas exist, including the Magnus formula, Tetens formula, Buck equation, and ARD equation. These formulas calculate the saturation vapor pressure at the given temperature, then determine the actual vapor pressure from the relative humidity, and finally calculate the temperature at which this vapor pressure would equal the saturation vapor pressure (the dew point).

For optimal indoor comfort, the ideal dew point range is typically between 10°C and 16°C (50°F to 60°F). Below 10°C may feel too dry, potentially causing skin and respiratory discomfort. Above 16°C begins to feel humid, and above 21°C feels quite uncomfortable. For most people, maintaining a dew point around 12-14°C with a temperature of 22-24°C provides the most comfortable indoor environment.