Bắc Bộ bắt đầu vào đợt rét đậm, nhiệt độ giảm sâu
Theo Trung tâm Dự báo Khí tượng Thủy văn Quốc gia, sáng sớm 27/12, bộ phận không khí lạnh đã tiến sát đến biên giới phía Bắc.
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