FEMA rates relative lightning risk for Rockingham County as relatively high and reports FEMA annualized frequency of 16.766 per year for the area.
FEMA summary
FEMA's profile for Rockingham County reports FEMA annualized frequency of 16.766 per year for lightning. FEMA's relative risk rating for the area is relatively 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 Rockingham County.
Lightning
FEMA combines its area-wide loss estimate and community data in this relative rating. Event frequency appears separately below.
Relative FEMA score
93.0/100
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 Rockingham County. It is not an estimate for a home or address.
City risk summary
For Portsmouth, FEMA rates lightning risk for Rockingham County as relatively high, with a relative score of 93.0/100. The next highest relative scores are hurricane at 88.8/100 and earthquake at 86.9/100.
Using FEMA data for Rockingham County, Portsmouth is #1 among 3 covered New Hampshire entries for lightning risk. Lawrence is about 31 straight-line miles from the Portsmouth map point; its FEMA figures cover Essex County.
For homeowners and movers
Preparedness actions
Living in Portsmouth? Learn how to handle water storage, sanitation, and security in a small space.
The map shows Portsmouth. All FEMA figures on this page cover Rockingham County.
The FEMA figures cover Rockingham County. Address-level conditions require local maps, building records, and property details.
FEMA rates relative lightning risk for Rockingham County as relatively high. Its FEMA annualized frequency is 16.766 per year. Damage at a specific address also depends on the building, soil, elevation, and exact hazard zone.
Among 3 New Hampshire cities covered by this directory, Portsmouth is #1 for relative lightning risk based on FEMA's score for Rockingham County. Homes within Portsmouth can have different soil, elevation, construction, and hazard-zone conditions.
In FEMA's data for Rockingham County, the highest relative ratings are Lightning (Relatively High), Hurricane (Relatively Moderate), and Earthquake (Relatively Low). FEMA uses estimated losses and community data along with event frequency when assigning these ratings.
The hazard numbers cover Rockingham County. For an individual home, check local fault, flood, fire, evacuation, and building records for the exact address.
FEMA gives Rockingham County an overall relative risk rating of relatively moderate. 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 | Lightning rating | Relative score |
|---|---|---|---|
| Lawrence, MA | 31 mi | Relatively High | 98.4 |
| Manchester, NH | 34 mi | Relatively High | 92.2 |
| Lowell, MA | 40 mi | Relatively High | 98.6 |
| Lynn, MA | 41 mi | Relatively High | 98.4 |
| Nashua, NH | 42 mi | Relatively High | 92.2 |
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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.