Severe frosts return to St. Petersburg. On Friday, the temperature will drop to minus 20 degrees at night in the Leningrad region and in St. Petersburg to minus 16-18 degrees. Cold weather will last on weekends. This is due to the cold mass from Finland. In the afternoon on weekends, the air temperature will be up to minus 9 degrees. Residents of St. Petersburg will experience sunny weather without precipitation. Water bodies, warn in the Hydro meteorological Center, will be slightly warmer.