北京今天最高气温仅-7.2℃，创今冬新低，今年“四九”为何这么冷？气象部门解读

Group 1 - The lowest temperature recorded in Beijing this winter reached -11°C, marking the second lowest since the winter of 2025, with the lowest being -11.4°C on January 2 [1] - The highest temperature recorded today was -7.2°C, which is a new low for this winter, dropping over 3°C from the previous high of -3.8°C on January 18 [1] - The current cold wave is attributed to a strong cold air mass affecting Beijing, with minimal cloud cover at night leading to significant radiative cooling [1][2] Group 2 - Historical data shows that extreme low temperatures in January are common in Beijing, with the lowest recorded at -19.6°C on January 7, 2021 [2] - The average temperature during the "Three Nines" period (January 8-16) this year was -1.6°C, which is significantly warmer than the historical average of -2.8°C [2] - The "Four Nines" period (January 17-25) is expected to be colder than the historical average of -2.6°C due to the ongoing cold air influence [2][3] Group 3 - The Beijing Climate Center indicates that the coldest temperatures typically occur around mid-January, with a gradual warming trend expected by late January [3] - By February, during the "Seven Nines" period, the average temperature is projected to rise to approximately 0.9°C, indicating a warming trend [3] Group 4 - The Summer Palace ice rink will reopen on January 20, 2026, after being closed due to snowfall [4][6] - Over 200 staff members have been working for more than 40 hours to clear snow from the ice rink, achieving 60% of the necessary cleanup [4]