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Observed at 03:00, Friday 6 December BBC Weather in association with MeteoGroup, external All times are Pacific Standard Time (America/Los_Angeles, GMT-8) unless otherwise stated.

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.

Monarch butterfly may gain threatened species status in U.S.

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