Core Points - The northern regions of China have experienced a significant drop in temperature, with the temperature line reaching 0°C in central North China, and the lowest temperature in Beijing recorded at -0.5°C as of October 20 [1] Group 1: Temperature Trends - As of mid-October, the average temperature in 16 northern provinces, including Beijing and Tianjin, was 10.4°C, which is consistent with the historical average of 10.2°C [2] - Certain areas, such as parts of Heilongjiang and Inner Mongolia, have recorded temperatures slightly below the historical average [2] - The current cold wave is characterized by a "penetrating" weak cold air that continuously enters, leading to a more pronounced feeling of cold due to a sharp drop in temperature after a period of warmth [3] Group 2: Climate Predictions - The winter of this year is expected to have temperatures close to or slightly above the historical average, with significant fluctuations between cold and warm periods [3] - The trend of increasing average winter temperatures in China is evident, with the Arctic warming at a rate higher than tropical regions, leading to more pronounced temperature swings [3] Group 3: Agricultural Impact - The upcoming cold weather may adversely affect agricultural production, particularly in northeastern regions where temperatures are expected to be 4°C to 6°C below average, with frost likely [4] - Farmers in northern regions are advised to expedite the harvest process and manage crops effectively to prevent damage from low temperatures [4]

Core Viewpoint - The recent cold wave in northern China has led to significantly lower temperatures, with average temperatures in 16 northern regions recorded at 10.4℃, close to the normal level of 10.2℃ for this time of year, but with some areas experiencing drops of 1℃ to 2℃ or more [1][3] Summary by Sections Temperature Analysis - The lowest temperature recorded in Beijing's southern suburbs reached -0.5℃ on October 20, with the 0℃ line moving to central North China [1] - The average temperature in northern regions has been affected by the Arctic Oscillation, which shifted from a positive to a negative phase, allowing cold air to spread southward [1][2] Weather Patterns - The persistent strong western and northern subtropical high has contributed to continuous low temperatures by facilitating the transport of warm, moist air that interacts with cold air, resulting in prolonged rainy weather [2] - The Central Meteorological Observatory predicts that temperatures in most northern areas will remain low until at least October 24, with southern regions also beginning to cool down [3] Agricultural Impact - The cold weather poses risks to agricultural production, particularly in northeastern regions and Inner Mongolia, where temperatures may drop by 4℃ to 6℃, leading to frost conditions [5] - Farmers are advised to expedite the autumn harvest and take measures to prevent crop damage due to low temperatures and moisture [5]

Core Viewpoint - A significant cold air mass is affecting China, leading to a sharp drop in temperatures across various regions, raising concerns about whether this winter will be colder than usual [1][8]. Summary by Sections Cold Air Impact - From October 16 to 21, a strong cold air mass moved southward, causing temperature drops of over 10°C in some areas. On October 20, the temperature in Beijing's southern suburbs reached -0.5°C [1]. - The cold air's influence is expected to continue, with another cold front forecasted to affect northern regions starting October 25 [3]. Meteorological Analysis - The Arctic pressure changes and mid-latitude pressure variations are linked, known as the Arctic Oscillation. A shift from a positive to a negative phase has allowed cold air to spread southward [1]. - The persistent strong western and northern subtropical high has contributed to continuous low temperatures in northern China due to the interaction with warm, moist air [2]. Future Weather Predictions - The Central Meteorological Observatory predicts that from October 25 to 27, regions such as Inner Mongolia, North China, and Northeast China will experience winds of 4-6 levels, with local gusts reaching 9 levels and temperature drops of 4-6°C, with some areas seeing drops exceeding 8°C [6]. - Rain and snow are expected in various regions from October 29 to 31, with temperature decreases anticipated [6]. Winter Temperature Outlook - Current forecasts suggest that this winter's temperatures will be close to or slightly warmer than the historical average, but with significant fluctuations between cold and warm periods [8]. - The occurrence of La Niña conditions in the equatorial Pacific may increase the likelihood of lower temperatures during the winter months, although global warming has led to instances of warmer winters even during La Niña years [10].

这两天，北方多地持续降温，很多人表示直接从短袖换上羽绒服。气象监测显示，在冷空气的影响 下，10月20日早晨，气温0摄氏度线抵达华北中部一带，北京南郊观象台最低气温达到零下0.5摄氏度。 20日14时较19日14时，陕西中南部、山西中南部、河南中南部等地部分地区气温下降4—8摄氏度。 10月北京等地还没供暖，为何就那么冷？近期北方是否比常年同期更冷？北方地区为何气温持续偏 低？这一轮冷空气的影响将持续到何时？国家气候中心气候预测室高级工程师李多对此进行了解析。 李多介绍，10月以来（截至10月19日），北京、天津、河北、山西、内蒙古、辽宁、吉林、黑龙 江、山东、河南、西藏、陕西、甘肃、青海、宁夏、新疆16个北方地区的平均气温为10.4摄氏度，接近 常年同期（10.2摄氏度）。 21日起，华西至黄淮等地持续的秋收连阴雨过程结束，专家建议，需加快秋收，已收地区需采取有 效措施排涝除湿、加快农田散墒，及时腾茬整地、适期足量播种冬小麦，保证出苗质量。 此外，西太副高持续偏强偏西偏北，低纬暖湿水汽沿副高外围向北输送，与冷空气在北方地区交汇 形成连阴雨天气，也导致气温持续偏低。 中央气象台预计，24日前，北方大部气温将处 ...