Philadelphia, Pennsylvania – Just as spring settles in, history shows the Philadelphia region can still flip back to winter quickly, with late-season snow events delivering measurable accumulation even after March 25.
According to the National Weather Service in Mount Holly, snowfall records dating back to 1885 reveal multiple late-season events, including a nearly 20-inch outlier in the early 1900s and several smaller but impactful snowfalls into April. While recent decades have trended quieter, the pattern has not disappeared.
Across southeastern Pennsylvania, including Philadelphia, Allentown, and Reading, late March and early April systems can still bring accumulating snow during overnight hours when temperatures briefly drop below freezing. including minor events of 1 to 3 inches have disrupted morning commutes on I-95, the Schuylkill Expressway, and SEPTA rail lines.
The primary setup to watch includes cold air wrapping into passing low-pressure systems, especially during nighttime or early morning windows when surface temperatures fall fastest.
Residents should stay alert for rapid forecast changes, particularly if colder air aligns with incoming precipitation. Keeping winter gear accessible and monitoring updates during early morning hours remains critical.
While no immediate storm is underway, the window for late-season snow remains open through early April, and additional advisories could be issued with little lead time.
