The average annual water vapor pressure value for St Petersburg City of St. Petersburg over the past 30 years is 8.99 kPa (kilopascals).
In city of St Petersburg City of St. Petersburg, the water vapor pressure in January is 0.3 kPa; The water vapor pressure in February is 0.29 kPa; The water vapor pressure in March is 0.38 kPa; The water vapor pressure in April is 0.56 kPa; The water vapor pressure in May is 0.79 kPa; The water vapor pressure in June is 1.2 kPa; The water vapor pressure in July is 1.44 kPa; The water vapor pressure in August is 1.37 kPa; The water vapor pressure in September is 1 kPa; The water vapor pressure in October is 0.74 kPa; The water vapor pressure in November is 0.54 kPa; The water vapor pressure in December is 0.38 kPa.
The vapour pressure of water is the pressure exerted by molecules of water vapor in gaseous form (whether pure or in a mixture with other gases such as air). The saturation vapour pressure is the pressure at which water vapour is in thermodynamic equilibrium with its condensed state.
Address: St Petersburg, City of St. Petersburg, Estonia.