“三九”已至 进入一年最冷时段 我国气温有啥特点？专家解析

Core Viewpoint - The current winter season in China is experiencing unusual warmth during the traditionally cold "San Jiu" period, with significant regional temperature variations observed across the country [1][3]. Group 1: Temperature Trends - The "San Jiu" period, typically the coldest time of the year, is expected to see overall higher temperatures this year, with many regions experiencing temperatures up to 2°C above the historical average [1][3]. - Historical data from 1991 to 2020 indicates that the coldest average temperature during "San Jiu" is -5.15°C, but this year, the temperature distribution will be uneven, with some areas like Inner Mongolia and Northeast China experiencing drops exceeding 10°C [3][5]. Group 2: Day-Night Temperature Variation - This year's "San Jiu" period is characterized by significant day-night temperature contrasts, particularly in southern regions where daytime highs may approach or exceed 20°C, while nighttime lows could drop below historical averages [5][7]. - The temperature difference between day and night in areas like Jiangnan could exceed 10°C, with some locations experiencing differences greater than 15°C, highlighting the stark contrast in temperature [5]. Group 3: Regional Weather Differences - Northern regions are expected to experience frequent cold air activity, leading to strong winds and snowfall, while southern areas will have warm days but cold nights, necessitating public awareness of weather changes [7].