‘Warm-up during the third nine-day period’ (Sanjiu) refers to a noticeable rise in temperature during what is traditionally considered the coldest time of the year—typically days 19 to 27 after the winter solstice. Many people wonder: is this an abnormal weather event? In fact, such warming isn’t necessarily abnormal. Although Sanjiu is theoretically the coldest phase of the year, weather systems are influenced by multiple factors—including weakened cold air activity, strengthened warm and moist airflows, and shifts in atmospheric circulation—all of which can lead to temporary warming. These short-term fluctuations fall within the range of normal meteorological variability. However, if significantly warmer conditions during Sanjiu become frequent or are accompanied by an increase in extreme weather events, it may signal a connection to long-term climate trends like global warming. Therefore, while an isolated Sanjiu warm-up doesn’t warrant alarm, a recurring pattern should raise awareness and prompt closer attention to underlying climate signals.
“三九回暖”指的是在一年中最冷的“三九”期间（通常为冬至后的第19天到第27天）气温明显回升的现象。许多人会疑惑：这是否属于气候异常？实际上，三九回暖并不一定意味着异常。虽然“三九”是一年中理论上最冷的时段，但天气系统受多种因素影响，如冷空气活动减弱、暖湿气流增强、大气环流调整等，都可能导致阶段性升温。这种短期波动属于正常气象变化范畴。然而，若三九期间频繁出现显著偏暖，或伴随极端天气事件增多，则可能与全球变暖等长期气候变化趋势有关。因此，单次三九回暖无需过度解读，但若成为常态，则值得警惕并关注其背后的气候信号。
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