Observed at 14:00, Wednesday 5 February BBC Weather in association with MeteoGroup, external All times are China Standard Time (Asia/Shanghai, GMT+8) unless otherwise stated.

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Higher pressure is usually associated with sunny weather, lower pressure with stormy weather. The temperature to which the air needs to be cooled for moisture to condense, for example, as dew.

Experts said weak cold air currents from the north pole were a key factor behind the unusual weather. As air pollution levels in the wider Beijing-Tianjin-Hebei area and northern part of Henan ...