北京为何这么冷？

Core Viewpoint - Beijing is experiencing an unprecedented cold wave, with temperatures dropping significantly due to strong cold air masses from northern regions, leading to the lowest temperatures recorded this winter [1] Temperature Records - The lowest temperature recorded at the Nanjiao Observatory reached -11°C, marking the second lowest since the winter of 2025, with the lowest being -11.4°C on January 2 this year [1] - The highest temperature today was only -7.2°C, which is a new record low for this winter, dropping over 3°C from the previous high of -3.8°C on the 18th [1] Meteorological Analysis - The sustained low temperatures are attributed to the control of cold air masses, with minimal cloud cover at night leading to radiative cooling [1] - Historical data indicates that extreme low temperatures in January are common, with the record low being -22.8°C set in 1951 [1] Seasonal Weather Patterns - The current cold wave is expected to last longer than usual due to continuous cold air influx, with temperatures projected to remain low until around January 23 [1] - The average temperature during the "Sanjiao" period (January 8-16) this year was -1.6°C, which is warmer than the historical average of -2.8°C [1] - The "Sijiao" period (January 17-25) is anticipated to be colder than the historical average of -2.6°C due to the ongoing cold air impact [1] Future Temperature Trends - Typically, the lowest temperatures in Beijing occur around mid-January, with a gradual increase expected as February approaches, where average temperatures rise to around 0.9°C by the "Qijiao" period [1]