What is Dew Point?

Dew point is a measurement of the amount of moisture in the air. It represents the temperature at which, if the air were cooled, it would become saturated with water vapor. This plays an important role in a variety of forecast considerations.

What is the Impact of Dew Point?

When the air temperature cools to the dew point, the air can no longer hold all of its water vapor, and some of the vapor condenses into liquid water. This process is critical in determining the type and formation of precipitation, fog, and dew.

The dew point is not only a clear indicator of the air’s moisture content but also a determinant of comfort levels. High dew points indicate high moisture levels, leading to a feeling of “mugginess” or discomfort, as high humidity hampers the efficiency of perspiration in cooling the body.

Meteorologists also use the low level dew points to gauge potential low temperatures and how the temperature might evolve through the day. For example, drier air will warm and cool more rapidly than very moist air.