Climate & Weather in Ashburn
Ashburn has a genuine Mid-Atlantic, humid-subtropical-to-continental-transition climate: an average July high of 88°F and a January low of 27°F, roughly 22 inches of annual snowfall (concentrated in January and February), about 45 inches of annual precipitation, and around 197 sunny days per year -- the same regional climate framing already established for Arlington, VA in this project.
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Learn moreA Genuine Four-Season, Humid-Subtropical-to-Continental-Transition Climate
Ashburn's climate sits in the same well-established Mid-Atlantic transition zone as Arlington's in this project: hot, humid summers (an average July high of 88°F) and cool-to-cold winters (an average January low of 27°F) with periodic snow -- a genuinely different profile from Denver's semi-arid high-plains climate or Phoenix/Tucson's desert heat, both covered elsewhere in this project.
Snowfall: A Real, Sourced Figure, Concentrated in Two Months
Ashburn averages roughly 22 inches of snow per year, with January (about 3.54 inches) and February (about 3.27 inches) the primary snow months -- a moderate, real Mid-Atlantic winter-snow figure, genuinely different from the deeper snowfall totals covered for mountain-adjacent metros elsewhere in this project, and from this project's Arlington, VA sibling record, which disclosed a specific research gap on snowfall totals that this Ashburn research pass was able to fill with a sourced figure.
Precipitation and Sunshine: A Real, Balanced Year-Round Picture
Ashburn sees roughly 45 inches of precipitation annually, distributed across the year with a real summer concentration tied to thunderstorm season (detailed on the flood-hurricane-risk topic page), against about 197 sunny days per year -- a genuine, if unremarkable, Mid-Atlantic sunshine profile rather than a standout in either direction.
Humidity Is a Real, Distinctive Summer Factor
Consistent with the base record's HUMID tag, Ashburn's summers carry real, well-established Mid-Atlantic humidity -- a genuinely different day-to-day summer experience from Denver's low-humidity semi-arid summers or the Southwest's dry desert heat, both covered elsewhere in this project. Anyone relocating from a drier climate should expect this as a real adjustment factor.
Severe Thunderstorms and Flash-Flood Season Run Spring Through Summer
As detailed on the flood-hurricane-risk topic page, Ashburn's real severe-weather risk -- flash flooding tied to Broad Run and Goose Creek, plus severe thunderstorms, not hurricane wind or hail-dominant storms -- concentrates in spring and summer, a real seasonal weather-planning consideration distinct from winter-specific concerns.
Key takeaways
- Ashburn has a genuine Mid-Atlantic, humid-subtropical-to-continental-transition climate: hot, humid summers (88°F average July high) and cool-to-cold winters (27°F average January low) with periodic snow.
- Annual snowfall runs about 22 inches, concentrated in January (3.54") and February (3.27") -- a sourced figure this pass was able to fill in, where this project's Arlington, VA sibling record disclosed a specific research gap on snowfall totals.
- Annual precipitation runs about 45 inches against roughly 197 sunny days per year -- a real, unremarkable Mid-Atlantic sunshine profile, not a standout in either direction.
- Humidity is a real, distinctive summer factor -- a genuine adjustment for anyone relocating from a drier climate, matching the regional framing already established for Arlington, VA in this project.
- Severe thunderstorms and flash-flood risk concentrate in spring and summer -- the same seasonal pattern behind the Broad Run/Goose Creek flash-flood warnings detailed on the flood-hurricane-risk topic page.
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