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First off, the average first measurable snow (0.1" or more) typically occurs around December 18.
The earliest measurable snow on record was 2.1" on October 10, 1979. This was also the last time Philadelphia received measurable snow in October.
The average first measurable snow falls on December 5.
Measurable snow has only fallen on 5 different days in October since 1922. The biggest single day snow in October was on Oct. 31, 1925 when 2.2" was recorded
Farther up the coast in Boston, the average first measurable snow occurs around November 30.
Boston saw its earliest measurable snow fall on October 10, 1979.
Measurable snow has been recorded in the city during October on four different occasions throughout history. Two of these occurrences were in the last decade with 0.1" falling on October 18, 2009 and 1.1" on October 29, 2005.