PENNSYLVANIA — Pennsylvania residents know that winter weather can be unpredictable, but history shows there is a general pattern for when the state sees its first measurable snowfall of the season.
On average, the first snow falls in Pennsylvania during November, though the timing varies depending on location and elevation.
In the higher elevations of the Allegheny Plateau and Pocono Mountains, the first measurable snow often arrives by early November, and in some years as early as late October.
Meanwhile, central and southern parts of the state, including cities such as Harrisburg and Philadelphia, typically do not see measurable snow until late November or even December.
According to historical weather data, Pittsburgh usually records its first measurable snowfall around mid-November, while Philadelphia averages its first snow closer to late November or early December.
In northern cities such as Erie, where lake-effect snow is common, flakes often fall by the end of October, with measurable totals usually arriving in early November.
While these averages offer a guideline, each year brings its own surprises. Some autumns pass with little to no early snow, while others bring an early-season storm that blankets parts of the state before Halloween.
