Tornado Risk in New Hampshire
All New Hampshire counties ranked by FEMA National Risk Index tornado score
Tornado risk — violently rotating columns of air capable of catastrophic local damage — is rated for 10 of 10 New Hampshire counties in FEMA's National Risk Index. Hillsborough County carries the state's highest tornado score at 82.6, with $7M in expected annual tornado losses.
No New Hampshire county reaches the High band for tornado, and expected annual losses from tornado total roughly $17M statewide. The full ranking below links to each county's complete 18-hazard risk profile.
County Rankings — Tornado
| # | County | Tornado Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Hillsborough County | Medium | 0.16 / yr | $7M | |
| 2 | Rockingham County | Medium | 0.12 / yr | $4M | |
| 3 | Merrimack County | Low | 0.13 / yr | $2M | |
| 4 | Cheshire County | Low | 0.14 / yr | $1M | |
| 5 | Strafford County | Low | 0.04 / yr | $1M | |
| 6 | Belknap County | Low | 0.05 / yr | $675K | |
| 7 | Grafton County | Very Low | 0.18 / yr | $378K | |
| 8 | Sullivan County | Very Low | 0.07 / yr | $383K | |
| 9 | Carroll County | Very Low | 0.11 / yr | $227K | |
| 10 | Coos County | Very Low | 0.12 / yr | $63K |
10 New Hampshire counties with measurable tornado risk. See the national tornado ranking or all New Hampshire counties by overall risk.
Frequently Asked Questions
Which New Hampshire county has the highest tornado risk?
Hillsborough County has the highest FEMA tornado risk score in New Hampshire at 82.6 (Medium), with $7M in expected annual losses and about 0.16 events per year.
How many New Hampshire counties face significant tornado risk?
10 New Hampshire counties record measurable tornado risk in FEMA's National Risk Index; 0 of them are rated High or Very High.