Allegheny County Climate
Allegheny County, Pennsylvania
Avg Annual Temp
51.9°F
Annual Precip
40.9"
Annual Snowfall
32.0"
Extreme Heat Days
15.0125
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Allegheny County Weather
Moderate temperatures in the Steel City
Allegheny County averages 51.9°F annually, placing it slightly below the national median temperature for the United States. The region experiences 40.9 inches of annual precipitation, which is lower than many other coastal or lakeside regions. This climate provides a balanced mix of seasonal variety without the extremes found in the deep south or far north.
Warmer than the Pennsylvania average
At 51.9°F, Allegheny County is two degrees warmer than the Pennsylvania state average of 49.9°F. While it is warmer than the state norm, it remains drier, receiving roughly 4.4 inches less rain and snow than the state average of 45.3 inches. This positioning makes it one of the more temperate major population centers in the Commonwealth.
A urban heat island in Western PA
Allegheny is warmer than adjacent Armstrong and Beaver counties, likely due to the urban heat island effect from Pittsburgh. Its 51.9°F annual average contrasts with Armstrong’s cooler 50.0°F average. However, the county receives less snow than its northern neighbors, making winter travel slightly more predictable.
Steamy July days and snowy winters
July brings an average of 73.6°F with approximately 15 days exceeding 90°F each year. Winter holds its own with 32 inches of annual snowfall and a January average that dips to 29.0°F. The seasonal swing is significant, with nearly 45 degrees of difference between the coldest and warmest months.
Balance salt supplies with cooling needs
Residents should plan for 32 inches of snow by keeping salt and shovels ready for the winter months. Because summer extreme heat days are frequent, central air conditioning is a vital utility for the 15 days of 90°F weather. Proper insulation helps manage the wide 31.4°F to 71.7°F seasonal temperature range.
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.