Philadelphia, Pennsylvania – A colder, increasingly active pattern is taking shape across Pennsylvania as December begins, prompting a December Snow Alert while winter in Philadelphia trends more unsettled. While it’s too early to determine exactly how many inches of snow could fall, one thing is certain: Pennsylvania is positioned for an above-average amount as the month progresses.
According to the Climate Prediction Center, below-normal temperatures are favored across much of the state through December, with near- to above-normal precipitation extending from the Appalachians to the Delaware Valley. According to the National Weather Service in Mount Holly, that setup supports several storm windows, with early clippers, coastal systems, and cold fronts all capable of producing accumulating snow in the first half of the month. Northern counties near I-80 may see the earliest impacts, while southern zones—including Philadelphia—could see mixed precipitation or wet snow during marginal setups.
According to PennDOT, travel hazards will likely increase along I-76, I-95, I-476, and mountain passes on the Pennsylvania Turnpike. Black ice before sunrise, quick bursts of heavier snow, and reduced visibility could slow the morning commute. Drivers are urged to check roadway conditions, carry winter kits, and allow extra distance on untreated surfaces.
Holiday markets, school concerts, and weekend events could see weather-related changes when storm tracks push close to the Mid-Atlantic coast. Residents should dress in layers, secure outdoor decorations, and prepare for brief power outages if wetter snow clings to branches and lines during stronger systems.
Specific snowfall totals remain uncertain, but long-range indicators point toward a colder, storm-friendly pattern — raising confidence that Pennsylvania is heading toward a snowy December and improving the chances of a White Christmas across several regions.
