2025-05-10 00:00:00 Dew point Humidity calculator App is the best app to find the temperature at which the water vapour of the atmospheric air must condense into liquid water and reaches its coolest point called the saturation. You can calculate the dew point temperature at which the air moisture converts into water using this calculator app. Dew point equation formula is based on August's modification of Regnault's formula and it gives the accurate dew point temperature and relative humidity of the air. The most convenient method of determining the humidity of the air for meteorological purpose is by the use of wet and drybuld thermometers.