A strong low pressure system brought rain transitioning to snow into the region December 24-25th. The deep and pivoting trough maintained the resident time of the precipitation and supported robust snowfall rates.  Snow accumulation by 7 AM on December 25th provided an official white Christmas across much of the region.

Winter Weather in ALLEGHENY, PENNSYLVANIA
From 24-DEC-20 16:00:00 to 25-DEC-20 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Up to 4.5 inches fell at the NWS Pittsburgh office on Christmas morning.

Winter Weather in ARMSTRONG, PENNSYLVANIA
From 24-DEC-20 16:00:00 to 25-DEC-20 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

An average of 2 to 3 inches fell in Armstrong County through Christmas Day.

Winter Storm in BEAVER, PENNSYLVANIA
From 24-DEC-20 16:00:00 to 25-DEC-20 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Up to 6 inches of snow fell in a 12 hour period on Christmas morning.

Winter Weather in BUTLER, PENNSYLVANIA
From 24-DEC-20 16:00:00 to 25-DEC-20 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Up to 4.5 inches of snow fell across Butler County on Christmas morning.

Winter Weather in CLARION, PENNSYLVANIA
From 24-DEC-20 16:00:00 to 25-DEC-20 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Up to 3 inches of snow fell across Clarion County on Christmas morning.

Winter Weather in FAYETTE, PENNSYLVANIA
From 24-DEC-20 16:00:00 to 25-DEC-20 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Up to 3 inches of snow fell in Fayette County.

Winter Weather in FAYETTE RIDGES, PENNSYLVANIA
From 24-DEC-20 16:00:00 to 25-DEC-20 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Up to 4 inches of snow fell across the ridges of Fayette County in 24 hours.

Winter Weather in FOREST, PENNSYLVANIA
From 24-DEC-20 16:00:00 to 25-DEC-20 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Between 4 to 6 inches fell in Forest County on Christmas Day.

Winter Weather in GREENE, PENNSYLVANIA
From 24-DEC-20 16:00:00 to 25-DEC-20 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Up to 5 inches of snow fell across Greene County on Christmas Day.

Winter Weather in INDIANA, PENNSYLVANIA
From 24-DEC-20 16:00:00 to 25-DEC-20 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Up to 2 inches of snow fell across Indiana county on Christmas Day.

Winter Weather in JEFFERSON, PENNSYLVANIA
From 24-DEC-20 16:00:00 to 25-DEC-20 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Up to 4 inches of snow fell in Jefferson County.

Winter Weather in LAWRENCE, PENNSYLVANIA
From 24-DEC-20 16:00:00 to 25-DEC-20 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Up to 5 inches of snow fell in 12 hours.

Winter Storm in MERCER, PENNSYLVANIA
From 24-DEC-20 16:00:00 to 25-DEC-20 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Six inches of snow in less than 12 hours.

Winter Weather in VENANGO, PENNSYLVANIA
From 24-DEC-20 16:00:00 to 25-DEC-20 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Up to 3 inches of snow fell on Christmas morning.

Winter Weather in WASHINGTON, PENNSYLVANIA
From 24-DEC-20 16:00:00 to 25-DEC-20 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Up to 5 inches of snow fell in 12 hours.

Winter Weather in WESTMORELAND, PENNSYLVANIA
From 24-DEC-20 16:00:00 to 25-DEC-20 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Up to 4 inches of snow fell in 12 hours; 6 inches in 24 hours.

Winter Weather in WESTMORELAND RIDGES, PENNSYLVANIA
From 24-DEC-20 16:00:00 to 25-DEC-20 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Four to five inches of snow fell across the ridges of Westmoreland County on Christmas Day.