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Norristown, PA
Full City Profile · Pennsylvania · Montgomery County County
3.1
/5.0
B
Good
35,782
Population
10,165/sq mi density
$65,058
Median Income
$27,999 per capita
$205,100
Home Value
$327,252 Zillow
$1,337
Median Rent
33.0% income on rent
55°F
Avg Temperature
271 sunny days/yr
494
Violent Crime/100K
1,577 property/100K
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.6 / 5.0
$65,058 median income, 3.7% unemployment
A+
Affordability
4.9 / 5.0
$205,100 home value, $1,337/mo rent
F
Safety
1.0 / 5.0
494 violent crimes/100K (30% above avg)
C+
Education
2.9 / 5.0
23.7% bachelor's degree or higher
Norristown experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 32°F in January while summers reach 78°F in July. The area gets 271 sunny days per year. Annual precipitation totals 50.7 inches. The area receives 25.3 inches of snow annually. Air quality is rated Good with a median AQI of 40.
Temperature
32°F Jan (0°C)
78°F Jul (25°C)
| Annual Average | 55.0°F |
| 2% above US avg | |
| January Average | 32°F (0°C) |
| July Average | 78°F (25°C) |
| Sunny Days | 271 days/yr |
Geography
| Elevation | 141 ft (43 m) |
| Area | 1.4 sq mi (3.6 km²) |
| Population Density | 10,165/sq mi |
| Coordinates | 40.1221°N, 75.3399°W |
| Timezone | America/New_York |
| County | Montgomery County County |
| Nearest Airport | Philadelphia International (PHL) 18 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0436 ppm |
| PM2.5 (Fine Particles) | 9.3 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 96.8 / 100 |
| Social Vulnerability | 19.8 / 100 |
| Community Resilience | 92.8 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Relatively Low |
| Strong Wind | Very High |
| Heat Wave | Relatively High |
| Winter Weather | Very High |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
| Coastal Flood | No Rating |
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 | - | - | 72 km |
| 1840 | PHILADELPHIA, PENNSYLVANIA | Earthquake | - | - | 38 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 32°F (0°C) | 3.5 in | Coldest |
| February | 32°F (0°C) | 2.9 in | Driest |
| March | 41°F (5°C) | 3.7 in | |
| April | 51°F (10°C) | 3.8 in | |
| May | 61°F (16°C) | 4.3 in | |
| June | 70°F (21°C) | 3.7 in | |
| July | 78°F (25°C) | 4.5 in | Warmest, Wettest |
| August | 73°F (23°C) | 4.1 in | |
| September | 66°F (19°C) | 4.1 in | |
| October | 55°F (13°C) | 3.1 in | |
| November | 45°F (7°C) | 3.8 in | |
| December | 36°F (2°C) | 3.5 in |
Norristown has a seasonal temperature swing of 46°F / from 32°F in January to 78°F in July. Total annual precipitation is 45.1 inches, with July being the wettest month (4.5") and February the driest (2.9").