数说今年首场寒潮雨雪冰冻有多强，南北方各地何时回暖

Core Insights - A significant cold wave has impacted central and eastern China, bringing the first large-scale rain, snow, and ice weather event of the winter from January 17 to 21, affecting over twenty provinces [1][2][3] Summary by Sections Snow and Ice Impact - The core areas of snowfall were identified in Henan, northern Hubei, and northern Anhui, with some regions experiencing heavy to extreme snowfall, such as over 20mm of precipitation in places like Jinzhai, Quxian, and Danjiangkou on January 19 [3][4] - Accumulated precipitation ranged from 5 to 15mm in many areas, with specific locations like Zhumadian in Henan and Liu'an in Anhui receiving between 20 to 26mm [1][2] Freezing Rain - Freezing rain occurred in regions including southern Hunan, central Hubei, and parts of Guizhou, with the maximum ice thickness reaching 169mm in Hunan [4] - Ice accumulation affected power lines in multiple counties across Hunan, Guizhou, and Hubei, leading to significant disruptions [4] Temperature Drops - A drastic temperature drop was recorded across most of the country, with average daily temperatures falling by 6°C to 10°C, and some areas experiencing drops of 12°C to 20°C [6][7] - Major cities reported record low temperatures, with Harbin reaching -30.1°C on January 18, marking the lowest temperature recorded in urban areas this winter [7][9] Future Weather Outlook - As of January 22, the cold wave's impact is diminishing, with southern regions expected to experience a stable warming trend, while northern areas will see slower and more variable temperature increases [10][12] - By January 25, temperatures in southern regions are projected to rise above 20°C, while northern areas, particularly in the northeast, will continue to experience below-average temperatures for at least the next week [12]