FEMA rates relative heat wave risk for Philadelphia County as very high and reports FEMA annualized frequency of 6.388 per year for the area.
FEMA summary
FEMA's profile for Philadelphia County reports FEMA annualized frequency of 6.388 per year for heat wave. FEMA's relative risk rating for the area is very high; the annualized frequency is a separate measure.
Hazard metrics cover FEMA county-equivalent geographies rather than individual addresses or parcels. Use local or state hazard maps before making a property, insurance, retrofit, or evacuation decision.
Select a hazard to inspect FEMA's figures for Philadelphia County.
Heat Wave
FEMA combines its area-wide loss estimate and community data in this relative rating. Event frequency appears separately below.
Relative FEMA score
99.9/100
Occurrence thresholds vary by hazard. The FEMA methodology defines the value for each hazard.
The area loss estimate combines FEMA's modeled losses to buildings, population, and agriculture across Philadelphia County. It is not an estimate for a home or address.
City risk summary
For Philadelphia, FEMA rates heat wave risk for Philadelphia County as very high, with a relative score of 99.9/100. The next highest relative scores are strong wind at 98.6/100 and tornado at 98.0/100.
Using FEMA data for Philadelphia County, Philadelphia is #1 among 9 covered Pennsylvania entries for heat wave risk. Trenton is about 25 straight-line miles from the Philadelphia map point; its FEMA figures cover Mercer County.
For homeowners and movers
Preparedness actions
Living in Philadelphia? Learn how to handle water storage, sanitation, and security in a small space.
The map shows Philadelphia. All FEMA figures on this page cover Philadelphia County.
The FEMA figures cover Philadelphia County. Address-level conditions require local maps, building records, and property details.
FEMA rates relative heat wave risk for Philadelphia County as very high. Its FEMA annualized frequency is 6.388 per year. Damage at a specific address also depends on the building, soil, elevation, and exact hazard zone.
Among 9 Pennsylvania cities covered by this directory, Philadelphia is #1 for relative heat wave risk based on FEMA's score for Philadelphia County. Homes within Philadelphia can have different soil, elevation, construction, and hazard-zone conditions.
In FEMA's data for Philadelphia County, the highest relative ratings are Heat Wave (Very High), Strong Wind (Very High), and Tornado (Relatively High). FEMA uses estimated losses and community data along with event frequency when assigning these ratings.
The hazard numbers cover Philadelphia County. For an individual home, check local fault, flood, fire, evacuation, and building records for the exact address.
FEMA gives Philadelphia County an overall relative risk rating of relatively high. Conditions at a specific home depend on its hazard zones, building type, maintenance, insurance, and access to evacuation routes and emergency services.
Start with this step: Confirm the exact hazard using official local maps before making property or insurance decisions. Know how local officials issue warnings and evacuation instructions. Use Ready.gov Be Informed and local emergency guidance for a complete plan.
Distances are measured between city coordinates.
| City | Distance | Heat Wave rating | Relative score |
|---|---|---|---|
| Trenton, NJ | 25 mi | Relatively High | 98.2 |
| Vineland, NJ | 38 mi | Relatively Moderate | 91.7 |
| Allentown, PA | 44 mi | Relatively High | 96.2 |
| Reading, PA | 48 mi | Relatively High | 95.5 |
| Lancaster, PA | 62 mi | Relatively Moderate | 89.8 |
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View productHazard metrics come from FEMA National Risk Index v1.19.0 (March 2023). City population and coordinates come from SimpleMaps US Cities Database. For current conditions, use official local maps, warnings, inspections, and professional advice.