Pennsylvania Snow Day Calculator: Chances & Closure Norms
What closes Pennsylvania schools? Snowday's Pennsylvania calculator usually flags a snow day at about 4–6 inches around Philadelphia and Pittsburgh, and 8–10 in lake-effect Erie. Pennsylvania requires 180 school days, with districts typically building in five. Enter your ZIP above for tomorrow's chance.
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Your forecast appears here. Enter a ZIP code or city above and press Calculate snow day chance.
Fun estimate only — always follow your school district’s official announcements.
How Pennsylvania districts decide snow days
Philadelphia-area districts typically close at 4 to 6 inches, especially when snow coincides with the morning commute; a well-timed storm announced the night before can close schools before the first flake. Pittsburgh and central districts hold out slightly longer, but ice storms — freezing rain on the ridges — close the whole middle of the state at an inch.
Erie operates on lake-effect logic: 8 to 10 inches of ordinary snowband is a delay, not a closure, but the December 2017 event (more than five feet in under a week) closed Erie City Schools for days and made national news. When districts exceed their five built-in days, Pennsylvania lets them apply for waivers — common after harsh Januaries.
Average snowfall in Pennsylvania
| Place | Avg. snow per year |
|---|---|
| Erie | ≈ 100 in/yr |
| Pittsburgh | ≈ 41 in/yr |
| Philadelphia | ≈ 23 in/yr |
Averages are approximate NOAA/NCEI 1991–2020 climate normals, rounded. Erie sits at the eastern end of the Great Lakes snowbelt and regularly posts one of the highest city snow totals in the Lower 48.
The storm Pennsylvania remembers
The Christmas 2017 Erie lake-effect storm. Between December 24 and 29, 2017, a stalled lake-effect band buried Erie under more than 65 inches of snow — including 34 inches on Christmas Day alone, a state single-day record. The city declared an emergency, roofs collapsed, and schools closed for a week while crews hauled snow out by the truckload.
Using the calculator in Pennsylvania
Snowday applies a 5-inch Pennsylvania baseline with commute-hour snow weighted 1.5× and cold/ice bonuses. Try the snow day calculator with ZIP 15222 (Pittsburgh), 16501 (Erie), or 19103 (Philadelphia). For the full picture, open the snow day calculator and see how commute-hour snowfall, cold, and wind combine into tomorrow’s percent chance — free, instant, no sign-up.
Last updated: October 2026