Will It Snow for Christmas?
We love christmas snow. For many of us a White Christmas
would be very similar to the scenes depicted on traditional
Christmas cards or as described in Charles Dicken’s
"A Christmas Carol". Ideally it would snow heavily,
between midnight and midday on the 25th of December.
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Probability of a White Christmas in US
Christmas snow: Probability
This is from NOOA (National Environmental Satellite, Data
and Information Service) :
"Generally, the greatest probabilities of christmas
snow-fall lie where they would be expected-- over the northern
U.S. and in mountainous areas. In defining a 'white Christmas'
as having a snow depth of at least 1 inch, the chances are
60% or better over an area including much of the northern
Rockies, the northern Great Plains, the Great Lakes area,
and most of New England. The chances are less than 20% over
most of the southern third of the country excluding the Rockies,
along with the Pacific coast".
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Probability of a White Christmas in UK
Christmas Snow-fall can occur in England any
time from November to April, but it is impossible to predict
at long range due to the unseasonable nature of the climate,
it being dominated by a vast source of warm, moist air from
the Atlantic, the spin of the Earth guaranteeing that in
general winds are brought in from that direction. On occasion
these winds weaken and that allows winds from a cold north
through to southeasterly direction to affect us.
The probability of a white Christmas was greatest
during the 30 years 1782-1811, when snow on two or three
days during Christmas (24th to 26th December) occurred on
an average of about one year in four, and includes the cold
December's mentioned above. It is also noteworthy, in the
context of this note, that the 30 yr period does show a
high incidence of with 2 or 3 days with snow falling over
the Christmas period: 4 out of 30 occasions being the second
highest such total in the series after that of 1782-1811.
Christmas snow: Frequency of snow in London
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