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Mount Gretna, PA
Full City Profile · Pennsylvania · Lebanon County County
4.1
/5.0
A
Great
197
Population
1,407/sq mi density
$108,125
Median Income
$64,256 per capita
$373,500
Home Value
$392,443 Zillow
52°F
Avg Temperature
275 sunny days/yr
24
Violent Crime/100K
24 property/100K
A
Overall
4.1 / 5.0
Strong
A+
Economy
4.9 / 5.0
$108,125 median income, 2.2% unemployment
A+
Affordability
4.7 / 5.0
$373,500 home value, /mo rent
D
Safety
1.8 / 5.0
24 violent crimes/100K
A+
Education
5.0 / 5.0
57.6% bachelor's degree or higher
Mount Gretna experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 30°F in January while summers reach 74°F in July. The area gets 275 sunny days per year. Annual precipitation totals 46.4 inches. The area receives 24.0 inches of snow annually. Air quality is rated Good with a median AQI of 40.
Temperature
30°F Jan (-1°C)
74°F Jul (24°C)
| Annual Average | 52.3°F |
| 3% below US avg | |
| January Average | 30°F (-1°C) |
| July Average | 74°F (24°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 713 ft (217 m) |
| Area | 0.1 sq mi (0.1 km²) |
| Population Density | 1,407/sq mi |
| Coordinates | 40.2456°N, 76.4715°W |
| Timezone | America/New_York |
| County | Lebanon County County |
| Nearest Airport | Harrisburg International (MDT) 16 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0453 ppm |
| PM2.5 (Fine Particles) | 10.5 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 79.9 / 100 |
| Social Vulnerability | 35.2 / 100 |
| Community Resilience | 83.4 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Relatively Low |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
2 tsunamis recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1895 | HIGH BRIDGE, NJ | Earthquake | — | — | 142 km |
| 1840 | PHILADELPHIA, PENNSYLVANIA | Earthquake | — | — | 119 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 30°F (-1°C) | 3.0 in | Coldest |
| February | 30°F (-1°C) | 2.6 in | Driest |
| March | 39°F (4°C) | 3.2 in | |
| April | 50°F (10°C) | 3.5 in | |
| May | 60°F (16°C) | 4.3 in | |
| June | 69°F (20°C) | 4.3 in | |
| July | 74°F (24°C) | 4.5 in | Warmest, Wettest |
| August | 72°F (22°C) | 3.6 in | |
| September | 65°F (18°C) | 3.7 in | |
| October | 54°F (12°C) | 3.1 in | |
| November | 44°F (7°C) | 3.7 in | |
| December | 34°F (1°C) | 3.3 in |
Mount Gretna has a seasonal temperature swing of 45°F / from 30°F in January to 74°F in July. Total annual precipitation is 42.7 inches, with July being the wettest month (4.5") and February the driest (2.6").