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Bradford, my nearest station giving sunshine hours, averages 34 hours for December out of about 200 possible, meaning it is overcast about 83% of the time.
I don't have specific data for christmas but on average 21.6 days of all days in December have a cloudcover of at least 6 octas in my hometown, so its very likely.
I guess about 75-80% of all christmas days are cloudy here.
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