New Hampshire strong wind risk
Hillsborough County has the highest strong wind risk in New Hampshire, scoring 86.9 out of 100 — rated "Relatively High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Hillsborough County | 86.9 | Relatively High | 0 |
| 2 | Rockingham County | 72.5 | Relatively Moderate | 0 |
| 3 | Merrimack County | 52.5 | Relatively Moderate | 0 |
| 4 | Grafton County | 48.3 | Relatively Low | 0 |
| 5 | Strafford County | 43 | Relatively Low | 0 |
| 6 | Belknap County | 37.6 | Relatively Low | 0 |
| 7 | Cheshire County | 29.9 | Relatively Low | 0 |
| 8 | Sullivan County | 24.6 | Relatively Low | 0 |
| 9 | Coos County | 22.8 | Relatively Low | 0 |
| 10 | Carroll County | 22.5 | Relatively Low | 0 |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Strong Wind risk nationally:
Other hazard risks in New Hampshire:
Frequently asked questions
What is the highest strong wind risk county in New Hampshire?
Hillsborough County, NH has the highest strong wind risk in New Hampshire, with a FEMA National Risk Index score of 86.9 out of 100 (rated "Relatively High").
What causes strong wind risk in New Hampshire?
Strong wind risk covers non-convective, non-tropical sustained high winds — including derechos and general high-wind events, but excluding tornado and hurricane winds. High scores appear in mountain passes, coastal headlands, and open plains where topography amplifies wind speeds. Damage concentrates on utility infrastructure, trees, and lightweight structures.