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Arnold, MD
Full City Profile · Maryland · Baltimore city County
3.9
/5.0
B+
Good
23,866
Population
2,206/sq mi density
$137,799
Median Income
$61,175 per capita
$547,800
Home Value
$586,678 Zillow
$2,177
Median Rent
29.1% income on rent
56°F
Avg Temperature
293 sunny days/yr
500
Violent Crime/100K
2,446 property/100K
B+
Overall
3.9 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$137,799 median income, 2.1% unemployment
A
Affordability
4.4 / 5.0
$547,800 home value, $2,177/mo rent
F
Safety
1.0 / 5.0
500 violent crimes/100K (32% above avg)
A+
Education
5.0 / 5.0
59.4% bachelor's degree or higher
Arnold enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 34°F in January while summers reach 78°F in July. The area gets 293 sunny days per year. Annual precipitation totals 45.0 inches. The area receives 19.3 inches of snow annually. Air quality is rated Good with a median AQI of 41.
Temperature
34°F Jan (1°C)
78°F Jul (26°C)
| Annual Average | 56.2°F |
| 4% above US avg | |
| January Average | 34°F (1°C) |
| July Average | 78°F (26°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 60 ft (18 m) |
| Area | 10.8 sq mi (28.0 km²) |
| Population Density | 2,206/sq mi |
| Coordinates | 39.0432°N, 76.5050°W |
| Timezone | America/New_York |
| County | Baltimore city County |
| Nearest Airport | Baltimore/Washington International Thurgood Marshall (BWI) 13 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0487 ppm |
| NO₂ (Nitrogen Dioxide) | 13.9 ppb |
| PM2.5 (Fine Particles) | 8.3 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 95.0 / 100 |
| Social Vulnerability | 74.1 / 100 |
| Community Resilience | 78.8 / 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 | Relatively High |
| Ice Storm | Relatively Moderate |
| Drought | No Rating |
| Cold Wave | Relatively High |
| Landslide | Very Low |
| Coastal Flood | Relatively Moderate |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
1 tsunami recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1840 | PHILADELPHIA, PENNSYLVANIA | Earthquake | — | — | 140 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 34°F (1°C) | 3.4 in | Coldest |
| February | 36°F (2°C) | 2.9 in | Driest |
| March | 44°F (7°C) | 4.0 in | |
| April | 54°F (12°C) | 3.4 in | |
| May | 64°F (18°C) | 4.3 in | Wettest |
| June | 72°F (22°C) | 3.7 in | |
| July | 78°F (26°C) | 4.1 in | Warmest |
| August | 76°F (24°C) | 4.1 in | |
| September | 69°F (20°C) | 3.9 in | |
| October | 57°F (14°C) | 3.2 in | |
| November | 48°F (9°C) | 3.5 in | |
| December | 39°F (4°C) | 3.5 in |
Arnold has a seasonal temperature swing of 44°F / from 34°F in January to 78°F in July. Total annual precipitation is 44.1 inches, with May being the wettest month (4.3") and February the driest (2.9").