Philadelphia, located in the Northeastern United States, has a climate influenced by both its inland position and the Atlantic Ocean. Newcomers to Philadelphia will experience the full range of four distinct seasons. Summers are hot and humid, while winters can be cold and often snowy. Spring and autumn offer more temperate conditions, with fall, in particular, being noted for its colourful foliage.

Snowfall in Philadelphia varies annually but tends to peak in January, with the city receiving an average of 21.7 inches (55cm) per year. Precipitation is spread throughout the year, with the late spring and early summer months typically being the wettest.

The warm season, from May to September, sees average daily highs of around 77°F (25°C). It's not uncommon for temperatures to soar up to 86°F (30°C) or higher during the peak of summer, with afternoon thunderstorms frequently providing a brief respite from the heat. Conversely, the cold season stretches from December to March, during which average daily highs are below 49°F (9°C). Winter temperatures often dip below freezing, and it's essential to be prepared for occasional cold spells.