2 FEMA areas

Winter Weather Risk by City in New Hampshire

Compare 3 cities using FEMA's relative winter weather scores and annualized frequency for the county-equivalent areas shown.

Highest relative score

72.5/100

Rockingham County

Covered cities: Portsmouth

Lowest relative score in this set

60.0/100

Hillsborough County

Covered cities: Manchester and Nashua

These are relative FEMA scores for county-equivalent areas. They are not annual probabilities or property-level findings.

New Hampshire winter weather rankings

Cities sharing a FEMA area are grouped together and receive the same score.

RankFEMA area and citiesRatingScoreAnnualized frequency
#1

Rockingham County

Portsmouth
Relatively Moderate72.5/1006.839 per year
#2

Hillsborough County

ManchesterNashua
Relatively Low60.0/1007.093 per year

Occurrence thresholds vary by hazard. The FEMA methodology defines the value for each hazard.

Preparing for winter weather

Ready.gov Be Informed ↗

For a home or move

  • ✓Confirm the exact hazard using official local maps before making property or insurance decisions.
  • ✓Review policy exclusions, deductibles, and temporary-living coverage with a licensed professional.
  • ✓Keep inspections, inventories, and critical documents in a secure location you can access after an emergency.

For a household plan

  • ✓Know how local officials issue warnings and evacuation instructions.
  • ✓Maintain water, food, lighting, medications, and communications for several days.
  • ✓Create a household communication plan and practice it before an emergency.

Questions about winter weather risk in New Hampshire

Which covered New Hampshire cities have the highest relative winter weather risk?

Portsmouth use FEMA data for Rockingham County, which has the highest relative winter weather score in this covered set at 72.5/100. Cities sharing the same FEMA area share the same score.

Which covered New Hampshire area has the lowest relative winter weather score?

Hillsborough County has the lowest score in this covered set at 60.0/100. This is a relative FEMA comparison, not a declaration that every property there is safe.

Are these winter weather figures city-level?

No. The city links provide geographic navigation, while the scores and frequencies cover the FEMA county-equivalent areas shown in the table. Address-level conditions require local maps and property details.

Is the FEMA relative score an annual probability?

No. The relative score compares FEMA areas on a 0–100 scale. Annualized frequency appears separately with hazard-specific units.

Source: FEMA National Risk Index v1.19.0, released March 2023. Hazard data covers FEMA county-equivalent areas.

FEMA source ↗Our methodology →