December was an extraordinary month. South-westerly winds bathed much of the UK in mild air for the whole month while Scotland was cooler. Heavy rain developed over northern Britain around this temperature contrast,with major flooding in Cumbria on 5-6 December, and in Lancashire, and Yorkshire and south-west Scotland after Christmas. From southern Scotland to North Wales there have been few whether any wetter months. It was warmer than the preceding mildest Decembers in Central England in at least 350 years of instrumental records.
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Source: theguardian.com