The dew point is the temperature to which the air must be cooled in order for it to become saturated with water vapor. It is the temperature at which the air can no longer hold any more water vapor in its gas form, and any further cooling will cause the water vapor to condense into liquid form, such as dew or precipitation. The higher the dew point, the more moisture is present in the air.

The dew point is a better measure of how muggy the air feels than relative humidity. For example, a temperature of 80 degrees and a dew point of 60 produces a relative humidity of 50%, but it would feel much more "humid" than a temperature of 30 degrees with a 100% relative humidity because of the higher dew point.

Dew point levels can be used to determine how comfortable or uncomfortable the air feels. Dew points less than or equal to 55 are considered "dry and comfortable," while dew points between 60 and 65 are considered "humid and somewhat uncomfortable," and dew points above 65 are considered "oppressive and very uncomfortable".

In summary, a high dew point means that there is a greater amount of moisture present in the air, and it can make the air feel more muggy and uncomfortable.