Pennsylvania starts the day locked in winter’s grip as cold air settles over the Delaware Valley. Sidewalks feel stiff. Windshields sparkle with frost. Temperatures hover near 25 degrees early, making this one of the colder December mornings so far.
According to the National Weather Service, the immediate concern is early travel. Bridges, ramps, and untreated side streets across Philadelphia may hold icy patches for a time. Drivers and pedestrians should move cautiously until temperatures climb above freezing later this morning.
The Weather pattern changes quickly after the cold start. Sunshine helps temperatures rebound into the low 30s today, then rise further Wednesday as milder air builds in. By midweek, highs reach the low 40s, easing the harsh winter feel for now.
Attention turns to Thursday, December 18th, when clouds increase and a developing system approaches. Rain becomes likely late Thursday into the evening, with precipitation chances near 90 percent overnight. Roads along I-95, I-76, and surface streets could turn slick during the evening commute.
Temperatures remain above freezing during the rain, peaking near 53 degrees Thursday. However, colder air returns late, and meteorologists are watching for a brief black ice risk early Friday where moisture lingers.
Friday improves gradually. A few early showers may linger, then skies begin to clear. Highs reach the low 50s, though a breeze keeps the air feeling brisk. The weekend trends quieter and cooler. Saturday brings partial sunshine with highs near 39, while Sunday warms slightly into the upper 40s.
While snow is not expected, the sharp temperature swings highlight a classic December transition. Freeze-thaw cycles increase slick-road risks during early holiday travel weeks.
Five-Day Outlook for Philadelphia, PA
- Wednesday: Mostly sunny, high near 42°
- Thursday: Rain late, high near 53°
- Friday: Early showers, high near 52°
- Saturday: Partly sunny, high near 39°
- Sunday: Partly sunny, high near 48°
