There’s no denying that it gets hot in Philadelphia during the summertime.
Urban areas, like Philadelphia, are hotter in the spring and summer when temperatures rise. This can be attributed to something dubbed the “urban heat island effect”.
https://www.phila.gov/2019-05-29-its-hot-outside-heres-how-you-can-staycoolphl/
The Collected Works of Jim Garrow 