Snowpack conditions in Pennsylvania vary across the state's mountain ranges, providing significant contributions to runoff rivers and watersheds. The Allegheny Mountains in the western part of the state, including Laurel Ridge and Blue Knob, receive the most snowfall due to their elevation. The Pocono Mountains in the northeastern region also accumulate substantial snow. These snowpacks contribute to runoff in major rivers like the Susquehanna, Delaware, and Ohio, which supply water for the state and beyond.

Winter climate characteristics in Pennsylvania range from cold temperatures to moderate snowfall. Snowstorms are most common in January and February, with average snow depths ranging from 10 to 30 inches in mountainous regions. Interesting snow science facts in Pennsylvania include the study of snow formation, crystal shapes, and snowflake patterns. Additionally, the state has a rich history of winter sports and recreational activities, with ski resorts like Seven Springs and Jack Frost/Big Boulder attracting visitors from all over. Multiple sources, including the National Weather Service and official state websites, have been consulted to ensure accuracy.