Pennsylvania stretches from the Delaware River to the Ohio border, encompassing historic Philadelphia, dynamic Pittsburgh, the scenic Pocono Mountains, the rolling Amish farmlands of Lancaster County, and some of the most important Revolutionary and Civil War battlefields in the United States. It is one of the original 13 colonies, home to Independence Hall, the Liberty Bell, and Gettysburg National Military Park.
Pennsylvania's climate varies by region. Philadelphia in the southeast experiences hot, humid summers (avg. 88°F/31°C in July) and cold winters (avg. 37°F/3°C in January) with occasional snow. Pittsburgh in the west has cloudier winters and slightly cooler summers. The northern tier (Potter County, Tioga County) is colder and snowier — a true four-season mountain climate. Lancaster County has fertile valley weather, slightly warmer than Philadelphia's suburbs. The Pocono Mountains experience significant snowfall (60–80 inches annually), supporting ski resorts from December through March.
Best time to visit
Best: Year-round
Avoid: None
Month-by-month weather
Typical conditions throughout the year.
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The seasons
What to expect in each part of the year.
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Crowds & peak times
When to expect tourists and when to avoid them.
- Items
- Period
- July–August
- Crowd level
- Very High
- Notes
- Summer peak; Independence Hall requires advance timed-entry passes; Hersheypark lines 60–90 minutes for top rides; Lancaster County B&Bs book out months ahead.
- Period
- October (foliage peak)
- Crowd level
- High
- Notes
- Foliage weekend reservations in Pocono B&Bs and state parks can sell out months ahead.
- Period
- May–June, September
- Crowd level
- Moderate
- Notes
- Best balance of good weather and manageable crowds.
- Period
- January–February
- Crowd level
- Low
- Notes
- Quietest period; hotel rates drop significantly in cities; some rural attractions closed or reduced hours.
Major events & festivals
Time your visit around what matters.