At 7 a.m. on Dec. 25, 2009, the official snow depth in Philadelphia was 7 inches, the leftovers from the colossal storm of the previous weekend.
Should measurable snow be observed at 7 a.m. this Dec. 25, it would mark the first time since 1966 that Philadelphia had consecutive White Christmases.
In any given year, the smart money would be on bare ground. On average, Philadelphians can expect a Christmas-morning snow cover about once every seven years.
If we include those occasions on which measureable snow fell on Dec. 25 sometime after 7 a.m., Philadelphia, the chances of seeing Christmas snow on the ground increase to about 1 in 5.