三九天是一年中最冷的时段之一，通常出现在冬至后的第19天到第27天之间。民间有‘冷在三九’的说法，因此很多人会根据三九期间的气温来判断整个冬季的冷暖趋势。然而，仅凭三九天回暖就断定今年是‘暖冬’并不科学。气象学上，‘暖冬’是指整个冬季（12月至次年2月）的平均气温明显高于常年同期平均值。这需要综合三个月的气温数据进行统计分析，而非依赖某几天甚至某一阶段的天气表现。三九天虽然寒冷，但其气温受短期天气系统（如冷空气活动减弱、暖湿气流增强等）影响较大，可能出现阶段性回暖，但这并不代表整个冬季都偏暖。此外，全球气候变化背景下，极端天气事件频发，冷暖波动更加剧烈。例如，某年三九异常温暖，但随后四九或一月下旬可能出现强寒潮，导致整体冬季气温回归正常甚至偏冷。因此，判断是否为暖冬，应以权威气象部门发布的季节气候预测和最终统计数据为准。简言之，三九天回暖只是短期天气现象，不能作为判定暖冬的依据。公众应关注长期气候趋势，理性看待短期气温波动。
The ‘Sanjiu’ period—typically spanning days 19 to 27 after the Winter Solstice—is traditionally considered one of the coldest times of the year in China. Many people use temperatures during this window to gauge whether the entire winter will be mild or severe. However, concluding that a warm Sanjiu period definitively indicates a ‘warm winter’ is not scientifically sound.Meteorologically, a ‘warm winter’ is defined by the average temperature from December through February being significantly higher than the long-term climatological average for that period. This assessment requires comprehensive data over three full months—not just a brief warm spell during Sanjiu. While Sanjiu is usually frigid, short-term weather patterns—such as weakened cold air masses or enhanced warm, moist airflow—can temporarily raise temperatures without reflecting the broader seasonal trend.Moreover, under the influence of global climate change, extreme and erratic weather events have become more frequent. A notably mild Sanjiu might be followed by a severe cold wave in late January or February, potentially offsetting earlier warmth and resulting in a normal or even colder-than-average winter overall.In short, a temporary warming during Sanjiu is merely a short-term weather fluctuation and should not be used as evidence of a warm winter. The public should rely on official seasonal forecasts and final statistical analyses from authoritative meteorological agencies for accurate assessments.
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