Westmoreland County Climate
Westmoreland County, Pennsylvania
Avg Annual Temp
50.5°F
Annual Precip
45.7"
Annual Snowfall
29.2"
Extreme Heat Days
9.042857142857144
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Westmoreland County Weather
Balanced temperatures in the Laurel Highlands
Westmoreland County averages 50.5°F annually, falling about 3.5 degrees below the national median. It serves as a transition zone between the warmer Ohio Valley and the cooler Appalachian ridges.
Mirroring the Pennsylvania state average
The county’s 50.5°F average is very close to the Pennsylvania state average of 49.9°F. This makes Westmoreland a representative example of the state's overall climate profile.
Typical precipitation for Western Pennsylvania
With 45.7 inches of annual precipitation, Westmoreland is almost exactly in line with the state average of 45.3 inches. It is slightly cooler than neighboring Washington County, which averages 51.8°F.
Consistent snow and warm July afternoons
Winters bring 29.2 inches of snow and a January average of 28.2°F. July is warm and occasionally humid, averaging 71.4°F with roughly 9 days each year hitting 90°F or higher.
Preparing for four distinct seasons
Residents need a versatile wardrobe and home systems to handle both sub-freezing winters and 90-degree summer spikes. The 29 inches of snow require reliable removal tools, but the totals are manageable compared to the state's northern tier.
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.