A low pressure system that moved off the North Carolina coast dropped 2 to 4 inches of snow across southeast Pennsylvania (except for parts of Philadelphia) and 3 to 6 inches across Berks County, the Lehigh Valley and the Poconos on the 29th.    Precipitation started as snow everywhere between 8 a.m EST and 11 a.m. EST during the morning of the 29th. In the local Philadelphia area, the snow changed to rain around Noon EST.  The snow fell at its heaviest during the first half of the afternoon. and ended during the late afternoon or early evening on the 29th. In spite of the 29th being a Saturday, the snow caused numerous, but mainly minor traffic accidents. Bucks, Chester and Montgomery Counties were hit particularly hard with accidents. In Lower Salford Township (Montgomery County), an uninjured three-year-old was trapped in his car seat after a two vehicle accident. Accidents closed the westbound lanes of the Pennsylvania Turnpike west of Downingtown in Chester County. Speeds overall were reduced on the Pennsylvania Turnpike. A couple of Philadelphia suburban municipalities declared snow emergencies.
Representative snowfall included 6.0 inches in Summit Hill (Carbon County), 5.3 inches in East Stroudsburg (Monroe County), 5.2 inches in Kutztown (Berks County), 5.0 inches in Fleetwood (Berks County), 4.8 inches in Slatington (Lehigh County), 4.6 inches in Albrightsville (Carbon County), 4.5 inches in Spring City (Chester County), 4.3 inches in Bushkill Township (Northampton County), 4.2 inches in Tobyhanna (Monroe County), 4.1 inches in West Rockhill (Bucks County), 4.0 inches in East Nantmeal (Chester County) and Wayne (Delaware County), 3.9 inches in Montgomeryville (Montgomery County), 3.8 inches in Boyertown (Berks County), 3.7 inches in Royersford (Montgomery County), 3.6 inches in King of Prussia (Montgomery County), 3.4 inches in Easton (Northampton County), 3.3 inches at the Lehigh Valley International Airport), 3.0 inches in Doylestown (Bucks County), 2.8 inches in Horsham (Montgomery County), 2.0 inches in West Chester (Chester County), Roxborough (Philadelphia County) and Brookhaven (Delaware County), 1.7 inches in Drexel Hill (Delaware County) and just a trace at the Philadelphia International Airport.
The snow was caused by a low pressure system that moved from the Texas coast on the morning of the 28th, to southern North Carolina on the morning of the 29th. From there it intensified as it move northeast and passed just east of Cape Hatteras on the afternoon of the 29th and south of Cape Cod on the evening of the 29th. Warmer air was able to move in and change the snow to rain in the local Philadelphia area, but sufficient cold air remained in place for precipitation to fall as snow throughout the event in the rest of Eastern Pennsylvania.

Winter Weather in DELAWARE, PENNSYLVANIA
From 29-DEC-12 10:00:00 to 29-DEC-12 14:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in BERKS, PENNSYLVANIA
From 29-DEC-12 08:00:00 to 29-DEC-12 18:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in LEHIGH, PENNSYLVANIA
From 29-DEC-12 08:30:00 to 29-DEC-12 19:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in NORTHAMPTON, PENNSYLVANIA
From 29-DEC-12 09:00:00 to 29-DEC-12 20:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in CARBON, PENNSYLVANIA
From 29-DEC-12 09:00:00 to 29-DEC-12 18:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in MONROE, PENNSYLVANIA
From 29-DEC-12 09:30:00 to 29-DEC-12 18:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in EASTERN CHESTER, PENNSYLVANIA
From 29-DEC-12 08:00:00 to 29-DEC-12 15:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in EASTERN MONTGOMERY, PENNSYLVANIA
From 29-DEC-12 09:00:00 to 29-DEC-12 15:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in LOWER BUCKS, PENNSYLVANIA
From 29-DEC-12 11:00:00 to 29-DEC-12 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in PHILADELPHIA, PENNSYLVANIA
From 29-DEC-12 10:00:00 to 29-DEC-12 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in WESTERN CHESTER, PENNSYLVANIA
From 29-DEC-12 08:00:00 to 29-DEC-12 17:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in WESTERN MONTGOMERY, PENNSYLVANIA
From 29-DEC-12 09:00:00 to 29-DEC-12 18:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in UPPER BUCKS, PENNSYLVANIA
From 29-DEC-12 11:00:00 to 29-DEC-12 18:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter