Loudoun County Climate
Loudoun County, Virginia
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
54.8°F
Annual Precip
44.4"
Annual Snowfall
—
Extreme Heat Days
31
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7a
Minimum winter temperature range for plant survival
3,711
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Loudoun County
Climate Verdict
Loudoun County has a mild, with an average annual temperature of 54.8°F, moderately wet with 44.4 inches of annual precipitation, occasional hot days — 30.9 per year above 90°F. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 33.1°F. summers are warm — July averages 76.6°F. The 44°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Loudoun County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Loudoun County closely matches the Virginia statewide average temperature of 56.2°F.
Climate Profile
About Loudoun County Weather
Subtropical Shifts in Northern Virginia
Loudoun County averages 54.8°F annually, aligning closely with the national median for temperate climates. The region experiences a humid subtropical environment characterized by distinct seasonal transitions.
Trailing the Commonwealth Average Temperature
At 54.8°F, Loudoun County remains slightly cooler than the Virginia state average of 55.9°F. Its location in the northern part of the state accounts for this lower temperature ranking compared to southern coastal counties.
Cooler Than Neighboring Manassas City
Loudoun's 54.8°F average is nearly a full degree cooler than Manassas city's 55.5°F. Both areas face similar precipitation patterns, with Loudoun receiving 44.4 inches of rainfall annually.
Intense Summers and Chilly January Nights
The county faces 31 extreme heat days annually when temperatures top 90°F, concentrated during the 76.6°F July peak. While snowfall data is limited for this specific station, winter averages drop to a cold 35.1°F.
Summer Heat Readiness is Critical
With a full month of 90-degree days, robust air conditioning is a necessity for Loudoun residents. The 44.4 inches of annual rain also requires well-maintained drainage systems to handle heavy Mid-Atlantic storm cycles.
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.