Our weather and climate analysis offers a detailed understanding of average weather patterns for locations across the globe. Derived from 26 years of historical simulated weather data from ECMWF, it provides valuable insights into typical weather conditions, including air temperature, humidity, precipitation, cloud cover and wind. It is important to note the data is not observational, but rather derived from climate reanalysis.
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United States > Philadelphia, PA > Overview
Discover if upcoming months are expected to be warmer, colder, wetter, or drier than average
What is the best time to visit Philadelphia to enjoy the optimal weather conditions?
This quick reference weather table contains a summary of the annual climate trends in Philadelphia. It contains key metrics, including average monthly high & low temperatures, rainfall, humidity and UV index. The data is presented on a monthly basis, allowing you to see how each these weather components change throughout the year.
Explore the most extreme weather events in Philadelphia over the past 26 years, including record highs and lows for temperatures, rainfall, and wind speeds. This data is sourced from the latest ERA5 reanalysis model spanning 2000 to 2025.
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Weather guides, climate insights, and travel planning stories that talk about Philadelphia.
Philadelphia experiences a temperate climate defined by distinct seasonal contrasts, characterized by hot summers and cold winters. WeatherBox data shows that the region undergoes significant thermal shifts, with the average daily temperature varying by 24.6°C (44.3°F) across the year. During the peak of the warm season, the atmosphere can feel sweltering, as average daily highs reach 30.3°C (86.5°F), although extreme heat events rarely push temperatures above 34.2°C (93.6°F). Conversely, the coldest months frequently bring freezing conditions, where daily lows drop to an average of -2.8°C (27.0°F) and can occasionally fall to -10.1°C (13.8°F) during severe cold snaps.
Precipitation is a consistent feature throughout the year, rather than being confined to a specific wet season. The total annual accumulation averages 1,139 mm (45 in), with the heaviest monthly rainfall peaking at 108 mm (4 in) during early summer. This moisture often contributes to muggy conditions later in the year, with relative humidity topping out at 69.4. While late spring often sees heavy cloud cover reaching 73.0, the summer months provide abundant sunshine, averaging 302.4 of sunlight when the days are longest.
Air movement and solar intensity also play major roles in the local weather profile. Prevailing winds typically arrive from the WNW, with the strongest breezes occurring in early spring when average wind speeds hit 13.2 km/h (8.2 mph). Solar radiation rises sharply during the warmer months, where the average peak UV Index is 6.9, indicating intense sun exposure. To visualize these climate patterns in greater detail, we invite you to explore the advanced weather charts on the WeatherBox website.