| Summary: | Knowledge on atmospheric precipitable water is necessary as input to hydrological, energetic and radiation models. Short historical review of parameterization of precipitable water is given. For Tallinn (Estonia), simple formulas are proposed to calculate precipitable water from observations of surface water vapor pressure. Seasonal changes of precipitable water in Tallinn are expressed by time series for 1990–2001 as well as by tabulation of monthly averages for this period. Parameterization of precipitable water, decadal time series, and tabulation of monthly averages are also given for three neighboring stations — St. Petersburg (Russia), Jokioinen and Sodankylä (Finland).
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