Group 1 - A strong cold air mass has swept across most parts of China, leading to significant temperature drops, with some areas experiencing a drop of over 8°C [1] - From October 25 to 27, regions including Inner Mongolia, North China, Northeast China, and Huanghuai will experience winds of 4-6 levels, with gusts reaching 7-9 levels [1] - Some areas have already entered the heating season, with preparations for heating in North China entering a critical phase [1] Group 2 - The heating system in Beijing has undergone a smart heating upgrade, allowing for real-time data collection and transmission to a smart platform for precise temperature control [2] - Over 40,000 maintenance tasks were completed after the last heating season, with approximately 550 kilometers of pipelines repaired [2] - The Beijing Urban Management Committee has mandated that all districts complete their heating system preparations by October 31 [2] Group 3 - The heating period in Beijing is officially from November 15 to March 15, but adjustments can be made based on weather conditions [3] - Temporary adjustments to the heating period require that the average outdoor temperature remains below 5°C for five consecutive days or in the event of heavy snowfall [3] - Heating units in Hebei and Shandong are also ramping up preparations, including safety inspections and equipment testing [3]

Core Points - The weather in Beijing is expected to change significantly starting October 22, with increased cloud cover and light rain in the afternoon and evening, including mixed precipitation in mountainous areas [1] - Recent cold air has led to record low temperatures in many cities, with Beijing's minimum temperature recorded at -0.3°C on October 21 [2] - The cold air is described as a slow penetration type, causing a substantial and prolonged drop in temperature, which contrasts with the previously warmer conditions [2] - Public concern regarding heating has risen, as the heating period in Beijing is set from November 15 to March 15, with conditions for early heating based on sustained low temperatures [2] - The heating department in Beijing has stated that the current temperatures do not meet the criteria for early heating, but they will monitor the situation closely [3] - Forecasts indicate a gradual temperature rise starting October 22, but multiple weak cold air fronts may still cause slight fluctuations in temperature later in October [4]