Philadelphia County Climate
Philadelphia County, Pennsylvania
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
57.0°F
Annual Precip
47.8"
Annual Snowfall
16.1"
Extreme Heat Days
35
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7b
Minimum winter temperature range for plant survival
4,246
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Philadelphia County
Climate Verdict
Philadelphia County has a mild, with an average annual temperature of 57.0°F, moderately wet with 47.8 inches of annual precipitation, occasional hot days — 34.6 per year above 90°F, light snow averaging 16.1 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 34.5°F. summers are warm — July averages 79.6°F. The 45°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
The moderate temperatures support hiking, cycling, and camping comfortably in spring, summer, and fall.
Regional Context
Philadelphia County is 7.2°F warmer than the Pennsylvania statewide average of 49.8°F, it is somewhat wetter than average for Pennsylvania, the county experiences 23.33284065934066 more extreme heat days than the state average.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.