华西都市报讯（记者吴冰清实习生董芯羽）"四九"结束，今冬最冷的日子大概率已过去。1月26日进 入"五九"，成都终于结束阴雨天气，迎来了阳光。 和偏暖的"三九"不同，刚刚过去的"四九"，全国平均气温较常年同期偏低，其中北方偏冷更加明显。接 下来的"五九"，预计总体偏暖。在四川盆地，"散装太阳"已上线。虽然阳光不够明媚，但气温已直线上 升。 "散装"太阳限时上线 这样的"散装太阳"仅限最近两三天。1月29日至31日，一股中等偏强冷空气将影响我国，四川盆地将再 度陷入阴雨之中。记者从四川省气象台了解到，1月26日至28日白天盆地以多云间晴天气为主；28日晚 上至31日盆地有一次降水天气过程，大部地方阴天有小雨，高海拔山区有雨夹雪或小雪，气温略有下 降，而川西高原北部东部和凉山州东北部有阵雪或阵雨，局地中到大雪。 ...

Group 1 - The core viewpoint of the article highlights that the cold weather during the "Four Nine" period will be significantly harsher than that of "Three Nine" [1] - A strong cold air mass is expected to impact most regions of China from January 17 to 21, with temperatures dropping by an average of 10°C [1] - In areas such as the Huai River basin and the middle and lower reaches of the Yangtze River, the cumulative temperature drop may exceed 20°C, leading to rapid freezing conditions in cities like Zhengzhou, Wuhan, Nanjing, and Hefei [1] Group 2 - The article notes that from January 19 to 20, there will be widespread rain and snow, causing a stark contrast in temperature perception from previously warm conditions to damp and cold [1] - The significant temperature drop and accompanying weather changes necessitate that individuals take precautions to stay warm [1]

Core Viewpoint - The article discusses the unusual weather patterns in China, highlighting a significant warming trend during the "San Jiu" period, which is typically the coldest time of the year, and anticipates a sharp temperature drop as the "Si Jiu" period approaches [1] Weather Analysis - A large-scale warming has been observed across China, with temperatures in many regions feeling more like spring than winter during the "San Jiu" period [1] - The winter front has reached southern China, with areas typically without winter transitioning from autumn to spring [1] - The warming trend is expected to continue for the next couple of days, with cities like Nanjing, Hefei, Wuhan, Hangzhou, and Changsha experiencing maximum temperatures exceeding 20°C, potentially breaking mid-January records [1] Upcoming Weather Changes - Starting from January 17, a strong cold air mass will impact most of China, leading to a general temperature drop of 10°C [1] - In the Huai River basin and the middle and lower reaches of the Yangtze River, the cumulative temperature drop may exceed 20°C, with cities like Zhengzhou, Wuhan, Nanjing, and Hefei facing rapid cooling [1] - Rain and snow are expected from January 19 to 20, causing a stark contrast in weather conditions from the previous warmth to a damp and cold environment [1]