1993 was a white Christmas I'm certain, alot of snow around though most of it probably arrived on Boxing/St. Stephen's Day if memory serves me correct. In the early-mid 80's there was one or two white Christmases though it's impossible to say as I was quite young then and offhand memory can often deceive the reality.
I don't think it's that shocking for London to be very cold in December but usually the actual snow itself holds off until January. We get snow virtually every year, can't remember too many years without it though we did have some very mild winters in the 00's that made some forecasters predict that white Christmases and freezing temperatures at winter were a thing of the past.
Historically, London has long been associated with snow at Christmas and many novelists and writers have documented London in snowfall, most famously Charles Dickens in 'A Christmas Carol' of course. So whether a white Christmas in London is a North American style homage or whether
it's just London reverting to type I don't know, but there probably is a little more American influence on Christmas over here these days, marketing wise especially though I'm sure that Dickens and other Victorian fables of old have shaped certain American Christmas traditions too
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I know snow fell on New Year's Eve at exactly midnight last Christmas as I was outside at the time in central London but I can't remember whether there was snow on the ground Christmas Day. Officially there have been many white Christmases that have been classified as such because of a flurry of light snow on Christmas Day around the vicinity of the metro weather centre in London but if you were to classify a white Christmas as snow on the ground then up until the mid-90's these occasions weren't that unlikely or rare and I'm sure there have been one or two snce though accurate, pin point memory evades me somewhat
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