The paper describes the characteristics of temporal variability of the water vapor column density of the atmosphere for several seasons of 1992 to 1994 in the city of Tomsk. The amplitudes of the short-term variations of the water vapor column density are shown to be close to the magnitude of its seasonal variations. The regular component of diurnal run weakly manifests itself and is minimal at noon. The correlation between water vapor column density and surface humidity is analyzed. The height of the atmosphere homogeneous in humidity is shown to have a meaning of its reciprocal altitude profile. Monthly mean and seasonal values of the water vapor column density agree well with the data of long-term aerological observations in the West Siberia.