1月里的20℃？下周“火箭式”升温！这怕是个假“小寒”吧

Core Viewpoint - The weather in China is experiencing fluctuations with a notable warming trend in the northern and southern regions, while cold air continues to impact certain areas, leading to significant temperature variations [1][3][5]. Group 1: Temperature Trends - The maximum temperatures in the Yangtze River basin are expected to rise to around 20°C, resembling spring-like conditions rather than typical winter temperatures [1][5]. - From December 12 to 16, temperatures in northern and southern China are projected to be higher than the historical averages for this period, particularly the maximum temperatures [5]. - In cities like Hefei, Wuhan, Nanjing, Hangzhou, Changsha, and Nanchang, maximum temperatures may approach or reach 20°C, with Changsha potentially challenging its mid-January record of 22.6°C [5]. Group 2: Cold Air Impact - Cold air will continue to push east and south, causing temperatures to drop in Northeast, East North China, Huanghuai, and Jianghuai regions, while slight cooling is also expected in Jiangnan and Southeast China [2]. - The Northeast region will experience frequent cold air and snowfall, with temperatures remaining significantly lower than the historical averages, particularly in cities like Changchun and Harbin, where maximum temperatures may stay below -10°C and -18°C, respectively [6]. Group 3: Temperature Variability - There will be a significant diurnal temperature range in many areas, with differences exceeding 15°C, and in some locations, surpassing 20°C, leading to a "day warm, night cold" scenario [7]. - Despite the warming trend during the day, the nighttime temperatures are not expected to rise significantly, necessitating precautions for warmth during early morning and evening outings [7]. Group 4: Weather Conditions - Most regions in China will maintain a dry weather pattern with minimal precipitation, even in the south where afternoon humidity levels may drop below 40% or even 30% [7]. - The lack of rainfall has raised fire risk levels in certain areas, including southern Fujian, southeastern Jiangxi, eastern and southern Guangdong, and southeastern Guangxi, highlighting the need for fire safety precautions [7].