Core Points - A strong cold air mass has swept across most parts of China since October 15, with temperatures expected to gradually rise after October 22, although it will still feel cool, necessitating warm clothing [1][3] - Snowfall occurred in Laiyuan County, Baoding, Hebei, with the lowest temperature dropping to 0°C, causing slippery roads and cautious driving [3] - Shanxi Province issued blue frost warnings, with temperatures in cities like Datong and Taiyuan also dropping to around 0°C, prompting agricultural departments to prepare for frost and protect crops [5] - In Jilin's Changbai Mountain, a rare natural phenomenon called evaporation fog was observed due to sudden temperature drops, creating a visually striking scene [7] - Zhejiang experienced a rapid temperature drop due to the cold air, with minimum temperatures falling to 13-15°C and strong winds causing a noticeable wind chill effect [9] - The upcoming frost descent on the 23rd marks a climatic turning point, with experts warning that blood pressure may rise, particularly among hypertensive patients, due to cold-induced vascular resistance [11]

Core Points - A strong cold air mass is affecting China, leading to significant temperature drops and precipitation across various regions [1][2][4] - The cold air is characterized by its intensity, wide range, and prolonged duration, impacting both northern and southern parts of the country [2][4] - Public advisories emphasize the need for warm clothing and caution during travel due to adverse weather conditions [1][6] Temperature Changes - From October 17, northern regions, including Beijing and the Northeast, will experience a notable drop in temperatures, with highs in Beijing expected to be between 11 to 13°C [10][15] - The lowest temperatures in some northern cities, such as Harbin, are forecasted to reach as low as 1°C, marking a new low since the start of autumn [2][10] - Southern regions, including Zhejiang and Guangdong, will also see maximum temperatures drop below 20°C by October 21 [2][4] Weather Warnings and Advisories - A blue cold wave warning was issued in Hebei, indicating significant temperature drops and potential impacts on visibility and road conditions [11][15] - Meteorological experts recommend the public adopt layered clothing strategies to cope with the cold [21][23] - Areas like Shanxi are preparing for early heating measures to ensure public comfort during the cold snap [16][20] Precipitation and Snowfall - Heavy rainfall has been reported in regions like Sichuan and Chongqing, with warnings about potential geological hazards [6][9] - Gansu province has experienced its first snowfall of the season, prompting road maintenance efforts to ensure safe travel [7][9] - The cold air mass is expected to bring rain and snow to various parts of the country, affecting agricultural activities [23]