DewPtFm

This app computes the dew point temperature and relative humidity from a wet bulb temperature, dry bulb temperature and barometric pressure. If a barometer is not available a guess of 29.8 inches of mercury will usually give a near enough result. Temperatures are in degrees Fahrenheit and pressures in inches of mercury.
Uses a computation method suggested by the National Weather Service of the National Oceanic and Atmospheric Administration, USA.