Core Viewpoint - The average temperature in China since the beginning of winter has been the second highest on record, with significant regional variations and multiple contributing factors identified [1][2]. Group 1: Temperature Data - The national average temperature from December 1, 2025, to January 13, 2026, was -2.1°C, which is 1.5°C higher than the historical average, marking the second highest since 1961 [1]. - Most regions in China experienced temperatures close to or above the historical average, with Hubei and Hunan provinces recording the highest temperatures since 1961, while five provinces including Shandong and Shaanxi had the second highest [1]. - The northeastern region and parts of Inner Mongolia and western Yunnan were the only areas with lower than average temperatures [1]. Group 2: Causes of Temperature Increase - The warm winter temperatures are attributed to a weakened Arctic vortex and a lack of active blocking high pressure in the Ural Mountains, leading to a reduced intensity of cold air affecting China [1][2]. - The influence of global warming is also noted, with an average increase of 0.4°C every decade since 1961 for winter temperatures in China, and a trend of warmer winters during La Niña years [2]. - Other factors influencing winter climate include Arctic sea ice, snow cover, and mid-to-high latitude atmospheric circulation systems, indicating a multi-factorial impact on temperature variations [2].