Loudoun County Climate
Loudoun County, Virginia
Avg Annual Temp
54.8°F
Annual Precip
44.4"
Annual Snowfall
—
Extreme Heat Days
30.9
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.