Founded in 1682 by William Penn as a Quaker haven, Philadelphia served as the young United States' capital on and off until 1800, hosting the Declaration of Independence and the Constitutional Convention. Sitting between the Delaware and Schuylkill rivers, about 100 miles inland from the Atlantic, its dense rowhouse grid holds more outdoor murals and sculpture than any other American city. Reading Terminal Market and South Philly's cheesesteak stands anchor a food scene built on two centuries of immigrant kitchens. A biotech corridor nicknamed 'Cellicon Valley' has grown around the university hospitals near Penn, adding startup offices beneath City Hall's statue of its founder.
Nights sit around 17°C and afternoons around 27°C, though some days reach 32°C.
Philadelphia has real seasons: summer afternoons sit around 30°C, winter ones around 8°C.
Some summer days reach 35°C, and some winter nights drop below freezing.
Rain is spread through the year — about 1122 mm in total, from 112 mm in September down to 70 mm in February — so no single month is a washout.
Air quality is worth watching: June averages an AQI of 66, while October clears to 52.
Days stretch to about 14.8 hours of light in June and shrink to 9.2 in December — something to weigh if you work to a fixed timezone.
For what you're after, the best months in Philadelphia are June – August. Expect fast internet (334 Mbps) and a high cost of living (about €2600 a month).
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