A quick moving low pressure system dropped one to three inches of snow from the Poconos south through the Lehigh Valley and the northern Philadelphia suburbs during the evening and overnight of the 24th and gave those areas a White Christmas.  Snow started falling during the late afternoon and early evening of the 24th. As warmer air moved in aloft, the snow changed to rain quickly in the local Philadelphia area. In the Philadelphia northern suburbs, Berks County and the Lehigh Valley, the snow changed to freezing rain late in the evening on the 24th and ended as freezing rain early in the morning of the 25th. Ice accumulations on top of the snow were less than five hundredths of an inch. Precipitation fell entirely as snow in the Poconos. The greatest impact was poor driving visibilities as well as poor conditions on less traveled and untreated roadways.
Representative snowfall included 2.5 inches in Summit Hill (Carbon County) and Elverson (Chester County), 2.4 inches in Kutztown (Berks County), 2.2 inches in Saylorsburg (Monroe County), 2.0 inches in Sinking Spring (Berks County), Bethlehem (Northampton County) and East Nantmeal (Chester County), 1.8 inches in Huffs Church (Berks County), 1.6 inches at the Lehigh Valley International Airport, 1.5 inches in West Rockhill (Bucks County) and Gilbertsville (Montgomery County), 1.4 inches in Lehighton (Carbon County), 1.2 inches in Blue Bell (Montgomery County), 1.1 inches in Martins Creek (Northampton County) and 1.0 inch in Concordville (Delaware County), West Chester (Chester County) and Jenkintown (Montgomery County).

The snow was caused by a low pressure system that moved northeast through  the Ohio Valley on the 24th and reached Pittsburgh, Pennsylvania at 7 p.m. EST. Overnight the low moved east and then reformed off the New Jersey coast on the morning of the 25th on its way farther offshore. The jump offshore kept most temperatures in Eastern Pennsylvania below freezing as precipitation fell.

Winter Weather in EASTERN CHESTER, PENNSYLVANIA
From 24-DEC-12 17:00:00 to 25-DEC-12 00:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in LOWER BUCKS, PENNSYLVANIA
From 24-DEC-12 17:00:00 to 25-DEC-12 00:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in EASTERN MONTGOMERY, PENNSYLVANIA
From 24-DEC-12 17:00:00 to 25-DEC-12 00:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in MONROE, PENNSYLVANIA
From 24-DEC-12 19:00:00 to 25-DEC-12 03:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in BERKS, PENNSYLVANIA
From 24-DEC-12 18:00:00 to 25-DEC-12 02:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in LEHIGH, PENNSYLVANIA
From 24-DEC-12 18:00:00 to 25-DEC-12 02:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in NORTHAMPTON, PENNSYLVANIA
From 24-DEC-12 18:00:00 to 25-DEC-12 02:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in WESTERN CHESTER, PENNSYLVANIA
From 24-DEC-12 17:00:00 to 25-DEC-12 00:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in UPPER BUCKS, PENNSYLVANIA
From 24-DEC-12 17:00:00 to 25-DEC-12 00:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in WESTERN MONTGOMERY, PENNSYLVANIA
From 24-DEC-12 17:00:00 to 25-DEC-12 00:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in CARBON, PENNSYLVANIA
From 24-DEC-12 19:00:00 to 25-DEC-12 03:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter