| http://www.w3.org/ns/prov#value | - A measurable amount is one tenth of an inch or more.From a statistical standpoint, there is a 19 percent chance of a trace or more of snow on Christmas Day, and only a 7 percent chance of measurable snow.The last time snow fell on Christmas was in 2002 when a trace occurred.The last time measurable snow fell on Christmas was 1993 when 0.3 inches occurred. 0.3 inches also fell on Christmas in 1992
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