According to the Köppen climate classification, the city falls under the humid subtropical climate zone, which means that it experiences hot and muggy summers and relatively mild winters. The summers in Philadelphia can be quite intense, with temperatures reaching up to 90 °F or higher.

However, the city’s climate is not solely defined by its summer weather. The fall and spring seasons in Philadelphia are generally mild, with comfortable temperatures and pleasant weather. Winters in Philadelphia can be moderately cold, with temperatures ranging from the low 20s to mid-30s °F.

The city experiences highly variable snowfall, which can range from light flurries to major snowstorms. On average, the seasonal snowfall in Philadelphia is around 22.4 inches, with rare snowfalls occurring in November.

Overall, Philadelphia’s climate can be described as a temperate maritime climate, according to the Trewartha climate classification, with a continental climate boundary to the north.