The Harrisburg area averages around 6 inches of snow through the end of December.
Those maps that @mitchnick posted show around 3 inches of snow near Harrisburg by 12/25.
Many of us near Harrisburg & the lower Susquehanna Valley have had around 1 inch of snow already this month.
My point is we still have a good chance to get on track with average snow by the end of the month.