Long-term measuring runs (1979-1992 and 1996-2003) of exposition of the solar erythema ultraviolet radiation (EUVR) for Siberian regions nearby Novosibirsk, Tomsk, Krasnoyarsk, Irkutsk, and Gorno-Altaisk cities are analyzed on the basis of satellite data measured with a TOMS instrument (onboard Nimbus-7 and Earth Probe satellites) and processed with the help of specially developed software. The period under study makes almost 22 years. Normals for annual EUVR variations are obtained and EUVR inter-annual variations and trends are estimated for the above regions. The revealed peculiarities of time variations of all analyzed parameters are indicative of regional specific features in their behavior. Spectral analysis of time series of daily surface EUVR expositions has been carried out, which allowed the time periods indicating some correlation between the EUVR and solar activity to be distinguished in addition to the natural annual harmonic. Possible mechanisms of observed long-term EUVR variations are discussed.