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Rosslyn Farms, PA
Full City Profile · Pennsylvania · Washington County County
4.6
/5.0
A+
Excellent
517
Population
923/sq mi density
$84,956
Median Income
$101,668 per capita
$369,000
Home Value
$466,730 Zillow
52°F
Avg Temperature
275 sunny days/yr
A+
Overall
4.6 / 5.0
Strong
A+
Economy
4.6 / 5.0
$84,956 median income, 2.7% unemployment
A
Affordability
4.2 / 5.0
$369,000 home value, /mo rent
A+
Education
5.0 / 5.0
78.5% bachelor's degree or higher
Rosslyn Farms experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 29°F in January while summers reach 73°F in July. The area gets 275 sunny days per year. Annual precipitation totals 39.6 inches. The area receives 44.1 inches of snow annually. Air quality is rated Good with a median AQI of 40.
Temperature
29°F Jan (-2°C)
73°F Jul (23°C)
| Annual Average | 51.8°F |
| 4% below US avg | |
| January Average | 29°F (-2°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 1,021 ft (311 m) |
| Area | 0.2 sq mi (0.6 km²) |
| Population Density | 923/sq mi |
| Coordinates | 40.4224°N, 80.0885°W |
| Timezone | America/New_York |
| County | Washington County County |
| Nearest Airport | Pittsburgh International (PIT) 9 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0454 ppm |
| NO₂ (Nitrogen Dioxide) | 11.5 ppb |
| SO₂ (Sulfur Dioxide) | 0.96 ppb |
| PM2.5 (Fine Particles) | 8.8 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 83.1 / 100 |
| Social Vulnerability | 22.7 / 100 |
| Community Resilience | 87.3 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Very Low |
| Lightning | Relatively High |
| Ice Storm | Relatively Low |
| Drought | Relatively Low |
| Cold Wave | Very Low |
| Landslide | Relatively Moderate |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 29°F (-2°C) | 2.5 in | Coldest |
| February | 31°F (-0°C) | 2.3 in | Driest |
| March | 40°F (4°C) | 3.2 in | |
| April | 50°F (10°C) | 3.2 in | |
| May | 61°F (16°C) | 3.9 in | Wettest |
| June | 69°F (21°C) | 3.9 in | |
| July | 73°F (23°C) | 3.9 in | Warmest |
| August | 72°F (22°C) | 3.5 in | |
| September | 65°F (18°C) | 3.2 in | |
| October | 53°F (12°C) | 2.5 in | |
| November | 43°F (6°C) | 3.0 in | |
| December | 33°F (1°C) | 2.8 in |
Rosslyn Farms has a seasonal temperature swing of 44°F / from 29°F in January to 73°F in July. Total annual precipitation is 37.9 inches, with May being the wettest month (3.9") and February the driest (2.3").