The dew point is the temperature the air needs to be cooled to (at constant pressure) in order to achieve a relative humidity (RH) of 100%. At this point the air cannot hold more water in the gas form.

Is dew point the same as temperature?

The dew point is the temperature at which air is saturated with water vapor, which is the gaseous state of water. ... The relative humidity is 100 percent when the dew point and the temperature are the same. If the temperature drops any further, condensation will result, and liquid water will begin to form.

How does temperature relate to dew point?

The higher the dew point temperature, the greater the amount of water vapor is present (source for clouds). The smaller the difference between the temperature and the dew point temperature, the higher the relative humidity (the closer the atmosphere is to a state in which water vapor would condense).