下周部分地区最高气温升至20℃上下，昼暖夜冷注意保暖

Group 1 - The core viewpoint indicates that while cold air is frequent, temperatures in North China and southern regions are generally rebounding, with maximum temperatures significantly higher than usual, particularly in the Yangtze River basin where many areas will see highs around 20°C [1][7] - The temperature drop will continue to move east and south, affecting Northeast, East North China, Huanghuai, and Jianghuai regions, with slight decreases also expected in Jiangnan and southeastern South China [2] - Over the next ten days, cold air will frequently impact the country, but its overall intensity will be weak and primarily affect northern areas, with most regions experiencing higher than normal temperatures [3] Group 2 - In Northeast China, cold air and frequent snowfall will lead to temperatures being generally lower than the same period in previous years, with cities like Changchun experiencing highs below -10°C for most of the next six days [5] - For North China and southern regions, temperatures will generally rise from December 12 to 16, with significant increases in maximum temperatures, particularly in cities like Hefei, Wuhan, Nanjing, Hangzhou, Changsha, and Nanchang, where highs may approach or reach 20°C [7] - Despite the warming trend, nighttime minimum temperatures will not rise significantly, leading to a widening diurnal temperature range, with some areas experiencing differences exceeding 20°C [7] Group 3 - Most regions in China will maintain a dry weather pattern with scarce rain and snow, even in the south where afternoon humidity may drop below 30% in some areas [8] - Due to the lack of precipitation, certain areas in southern Fujian, southeastern Jiangxi, eastern and southern Guangdong, and southeastern Guangxi will have high forest fire risk levels, necessitating caution regarding fire safety [8]