Washington County Climate
Washington County, Pennsylvania
Avg Annual Temp
51.8°F
Annual Precip
41.1"
Annual Snowfall
26.6"
Extreme Heat Days
10.85
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Washington County Weather
A temperate climate near the national median
Washington County’s 51.8°F annual average temperature sits just below the national median of 54°F. It enjoys a balanced four-season climate with moderate humidity and predictable weather patterns.
Warmer than the average Pennsylvania county
At 51.8°F, Washington County is warmer than the state average of 49.9°F. It benefits from its southwestern location, which typically avoids the harsher cold found in the state's northern and central highlands.
Slightly warmer and drier than its neighbors
The county is warmer than nearby Westmoreland, which averages 50.5°F. Washington is also relatively dry for the region, receiving 41.1 inches of annual precipitation compared to the state average of 45.3 inches.
Mild winters and warm, humid summers
Winters are manageable with a January average of 29.0°F and a modest 26.6 inches of snowfall. Summers are warmer than the state norm, featuring a July average of 72.9°F and 11 days of extreme heat above 90°F.
Managing humidity and light snow
With 11 days of extreme heat, central air conditioning is a standard comfort for local homeowners. The 26.6 inches of snow are light enough that a standard snowblower or shovel usually suffices for winter maintenance.
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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.