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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.

Why do groundhogs emerge on February 2 if it’s not to predict the weather?

Observed at 16:00, Wednesday 29 January BBC Weather in association with MeteoGroup, external All times are Central Standard Time (America/Chicago, GMT-6) unless otherwise stated.

Steer clear of a ‘snownado’ if you see one on a cold, sunny day ...