北方大部地区已入冬，局地偏早20天以上

Core Points - The northern regions of China have entered winter earlier than usual, with some areas experiencing winter conditions up to 20 days ahead of the normal schedule [3][4] - The average national temperature in October was 11.1°C, close to the historical average, but the month saw a significant temperature drop in the latter half [2][3] - October recorded the third-highest rainfall for the month in history, with an average precipitation of 51.5 mm, which is 51.8% more than the historical average [4] Temperature Trends - The temperature in early October was historically high, but a strong cold air mass from October 16 to 21 caused a drop of 8°C to 14°C across much of central and eastern China [3] - Northeastern and northern regions, including parts of Inner Mongolia and Heilongjiang, experienced early winter conditions, while some areas in the northwest and southwest saw delayed winter by up to 20 days [3] Precipitation and Weather Events - October saw six significant rainfall events, leading to localized flooding in provinces such as Shandong and Sichuan [4] - The 21st typhoon, "Maidum," made landfall in Guangdong and Guangxi, causing heavy rainfall, with the highest recorded daily precipitation reaching 369.4 mm in Guangxi [4][5] November Climate Forecast - For November, temperatures in northeastern and eastern Inner Mongolia are expected to be lower than the historical average, while most other regions will be close to or above average [7][8] - Increased precipitation is anticipated in northeastern regions, with warnings for potential low-temperature rain and snow disasters, particularly in the first half of the month [8]