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Mercersburg, PA
Full City Profile · Pennsylvania · Franklin County County
3.2
/5.0
B
Good
1,940
Population
2,156/sq mi density
$69,583
Median Income
$40,321 per capita
$210,400
Home Value
$283,577 Zillow
$784
Median Rent
23.0% income on rent
55°F
Avg Temperature
302 sunny days/yr
64
Violent Crime/100K
2,248 property/100K
B
Overall
3.2 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.1 / 5.0
$69,583 median income, 3.3% unemployment
A+
Affordability
5.0 / 5.0
$210,400 home value, $784/mo rent
F
Safety
1.0 / 5.0
64 violent crimes/100K
C+
Education
2.5 / 5.0
19.2% bachelor's degree or higher
Mercersburg experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 33°F in January while summers reach 78°F in July. The area gets 302 sunny days per year. Annual precipitation totals 35.6 inches. Air quality is rated Good with a median AQI of 40.
Temperature
33°F Jan (0°C)
78°F Jul (25°C)
| Annual Average | 55.4°F |
| 3% above US avg | |
| January Average | 33°F (0°C) |
| July Average | 78°F (25°C) |
| Sunny Days | 302 days/yr |
Geography
| Elevation | 547 ft (167 m) |
| Area | 0.4 sq mi (0.9 km²) |
| Population Density | 2,156/sq mi |
| Coordinates | 39.8319°N, 77.9029°W |
| Timezone | America/New_York |
| County | Franklin County County |
| Nearest Airport | Hagerstown Regional/Richard A Henson Field (HGR) 13 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0449 ppm |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 76.4 / 100 |
| Social Vulnerability | 32.4 / 100 |
| Community Resilience | 63.5 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Low |
| Drought | Relatively Moderate |
| Cold Wave | Very Low |
| Landslide | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 33°F (0°C) | 2.6 in | |
| February | 32°F (0°C) | 2.5 in | Coldest, Driest |
| March | 41°F (5°C) | 3.2 in | |
| April | 51°F (11°C) | 3.4 in | |
| May | 61°F (16°C) | 3.9 in | Wettest |
| June | 69°F (21°C) | 3.7 in | |
| July | 78°F (25°C) | 3.6 in | Warmest |
| August | 72°F (22°C) | 3.3 in | |
| September | 65°F (19°C) | 3.2 in | |
| October | 54°F (12°C) | 3.3 in | |
| November | 44°F (7°C) | 3.3 in | |
| December | 34°F (1°C) | 2.8 in |
Mercersburg has a seasonal temperature swing of 45°F / from 32°F in February to 78°F in July. Total annual precipitation is 38.8 inches, with May being the wettest month (3.9") and February the driest (2.5").