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Herndon, VA
Full City Profile · Virginia · Fairfax city County
3.8
/5.0
B+
Good
24,529
Population
5,718/sq mi density
$141,418
Median Income
$56,264 per capita
$568,700
Home Value
$730,346 Zillow
$2,147
Median Rent
23.8% income on rent
56°F
Avg Temperature
293 sunny days/yr
259
Violent Crime/100K
1,093 property/100K
B+
Overall
3.8 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.8 / 5.0
$141,418 median income, 2.9% unemployment
A
Affordability
4.4 / 5.0
$568,700 home value, $2,147/mo rent
F
Safety
1.0 / 5.0
259 violent crimes/100K
A+
Education
5.0 / 5.0
50.3% bachelor's degree or higher
Herndon enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 34°F in January while summers reach 77°F in July. The area gets 293 sunny days per year. Annual precipitation totals 43.2 inches. The area receives 21.0 inches of snow annually. Air quality is rated Good with a median AQI of 35.
Temperature
34°F Jan (1°C)
77°F Jul (25°C)
| Annual Average | 55.7°F |
| 3% above US avg | |
| January Average | 34°F (1°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 354 ft (108 m) |
| Area | 4.3 sq mi (11.1 km²) |
| Population Density | 5,718/sq mi |
| Coordinates | 38.9704°N, 77.3871°W |
| Timezone | America/New_York |
| County | Fairfax city County |
| Nearest Airport | Washington Dulles International (IAD) 8 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 35.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 5.3 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 75.8 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Hurricane | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Very Low |
| Drought | No Rating |
| Cold Wave | Very Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 34°F (1°C) | 2.8 in | Coldest |
| February | 36°F (2°C) | 2.7 in | Driest |
| March | 45°F (7°C) | 3.4 in | |
| April | 55°F (13°C) | 3.1 in | |
| May | 64°F (18°C) | 4.0 in | Wettest |
| June | 73°F (23°C) | 3.7 in | |
| July | 77°F (25°C) | 3.5 in | Warmest |
| August | 76°F (24°C) | 3.7 in | |
| September | 69°F (20°C) | 3.6 in | |
| October | 57°F (14°C) | 3.2 in | |
| November | 47°F (8°C) | 3.4 in | |
| December | 38°F (3°C) | 3.1 in |
Herndon has a seasonal temperature swing of 43°F / from 34°F in January to 77°F in July. Total annual precipitation is 40.1 inches, with May being the wettest month (4.0") and February the driest (2.7").