Washington County Climate
Washington County, Pennsylvania
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
51.8°F
Annual Precip
41.1"
Annual Snowfall
26.6"
Extreme Heat Days
11
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
3,167
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Washington County
Climate Verdict
Washington County has a mild, with an average annual temperature of 51.8°F, moderately wet with 41.1 inches of annual precipitation, rare extreme heat with only 10.850000000000001 days above 90°F annually, moderate snowfall of 26.6 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 29.0°F. summers are warm — July averages 72.9°F. The 44°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Washington County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Washington County closely matches the Pennsylvania statewide average temperature of 49.8°F, it is somewhat drier than average for Pennsylvania.
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.
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.