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Adelphi, MD
Full City Profile · Maryland · Prince George's County County
3.4
/5.0
B
Good
17,210
Population
6,327/sq mi density
$80,833
Median Income
$32,608 per capita
$401,700
Home Value
$439,626 Zillow
$1,757
Median Rent
34.0% income on rent
58°F
Avg Temperature
293 sunny days/yr
B
Overall
3.4 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.9 / 5.0
$80,833 median income, 4.5% unemployment
B+
Affordability
3.9 / 5.0
$401,700 home value, $1,757/mo rent
C+
Safety
2.5 / 5.0
0 violent crimes/100K
B
Education
3.2 / 5.0
27.4% bachelor's degree or higher
Adelphi enjoys a temperate climate with an average annual temperature of 58°F (14°C). Winters average 36°F in January while summers reach 80°F in July. The area gets 293 sunny days per year. Annual precipitation totals 45.6 inches. The area receives 9.7 inches of snow annually. Air quality is rated Good with a median AQI of 41.
Temperature
36°F Jan (2°C)
80°F Jul (27°C)
| Annual Average | 58.3°F |
| 8% above US avg | |
| January Average | 36°F (2°C) |
| July Average | 80°F (27°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 113 ft (34 m) |
| Area | 2.7 sq mi (7.0 km²) |
| Population Density | 6,327/sq mi |
| Coordinates | 38.9971°N, 76.9668°W |
| Timezone | America/New_York |
| County | Prince George's County County |
| Nearest Airport | Ronald Reagan Washington Ntl (DCA) 11 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0451 ppm |
| NO₂ (Nitrogen Dioxide) | 10.4 ppb |
| SO₂ (Sulfur Dioxide) | 0.08 ppb |
| CO (Carbon Monoxide) | 0.17 ppm |
| PM2.5 (Fine Particles) | 7.7 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 93.2 / 100 |
| Social Vulnerability | 49.4 / 100 |
| Community Resilience | 29.8 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively High |
| Winter Weather | Very High |
| Lightning | Very High |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Moderate |
| Coastal Flood | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 36°F (2°C) | 3.2 in | Coldest |
| February | 37°F (3°C) | 2.8 in | Driest |
| March | 45°F (7°C) | 3.7 in | |
| April | 55°F (13°C) | 3.3 in | |
| May | 65°F (18°C) | 4.4 in | Wettest |
| June | 73°F (23°C) | 3.6 in | |
| July | 80°F (27°C) | 4.2 in | Warmest |
| August | 76°F (25°C) | 3.9 in | |
| September | 70°F (21°C) | 3.9 in | |
| October | 58°F (14°C) | 3.4 in | |
| November | 48°F (9°C) | 3.4 in | |
| December | 39°F (4°C) | 3.3 in |
Adelphi has a seasonal temperature swing of 44°F / from 36°F in January to 80°F in July. Total annual precipitation is 43.1 inches, with May being the wettest month (4.4") and February the driest (2.8").