Philadelphia County Climate
Philadelphia County, Pennsylvania
Avg Annual Temp
57.0°F
Annual Precip
47.8"
Annual Snowfall
16.1"
Extreme Heat Days
34.6
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Philadelphia County Weather
A Warm Urban Subtropical Hub
Philadelphia's 57.0°F average annual temperature is well above the national median. The city is classified as humid subtropical, influenced by both its low elevation and urban heat island effect.
The Warmest County in the State
Philadelphia is the warmest county in Pennsylvania, averaging over 7 degrees higher than the state average of 49.9°F. It is also one of the least snowy areas in the Commonwealth.
Significantly Milder Than Surrounding Areas
The city experiences much less snow than its suburban neighbors, with just 16.1 inches annually. Temperatures remain consistently higher than in Montgomery or Bucks counties.
Intense Summer Heat Waves
Philadelphia endures 35 days of extreme heat over 90°F, the highest in this region. Winters are the mildest in the state, with a January average of 34.5°F and minimal heavy snow events.
Focus on Heat Mitigation
Effective air conditioning and urban cooling strategies are vital for the 35 days of extreme heat. Winter preparations can be modest, as the 16.1 inches of snow often melts quickly.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.