Dew Point Equations by NOAA

saturated water vapor pressure at the wet bulb temperature (milibar)

dewpointequation1.gif

saturated water vapor pressure at the dry bulb temperature (milibar)

dewpointequation2.gif

actual water vapor pressure (milibar)

dewpointequation3.gif

relative humidity

dewpointequation4.gif

dew point °Celsius

dewpointequation5.gif