what is dew point temperature of
The dew point is always lower than (or equal to) the air temperature. If the air temperature cools to the dew point, or if the dew point rises to equal the air temperature, then dew, fog or clouds begin to form. At this point where the dew point temperature equals the air temperature, the relative humidity is 100%.he dewpoint temperature is the temperature at which the air can no longer hold all of the water vapor which is mixed with it, and some of the water vapor must condense into liquid water.