最新全国入冬进程图：冬季版图已达鼎盛，南方多地领到春日体验卡

Core Viewpoint - The winter front in China has advanced to the southernmost regions, with significant temperature drops recorded in various areas, while some southern regions are experiencing unusually warm temperatures due to a temporary break in cold air [1][2][4]. Group 1: Winter Front Progression - As of January 13, the winter front has reached northern parts of South China, marking the largest winter range of the year [4]. - Cities such as Chongqing and Guilin entered winter on January 1, while others like Ganzhou and Hezhou followed on January 2 [5]. Group 2: Temperature Fluctuations - Despite the winter onset, many southern regions are expected to experience record-breaking warm temperatures in the coming days, with cities like Nanjing, Hefei, and Wuhan potentially exceeding 20°C [7]. - A significant temperature drop is anticipated from January 18 to 20, with central and eastern regions experiencing a notable decrease, possibly making this period the coldest of the winter [9].