BEIJING, Jan. 23, 2016 (Xinhua) -- Tourists visit the Tian'anmen Square in cold in Beijing, capital of China, Jan. 23, 2016. The highest temperature in Beijing dropped to under minus 10 degrees Celsius on Friday and will hit a 30-year low of minus 17 degrees Celsius from Saturday through Sunday, the Beijing meteorological station said. (Xinhua/Ju Huanzong)