Heat Wave Risk in New Hampshire
All New Hampshire counties ranked by FEMA National Risk Index heat wave score
Heat Wave risk — prolonged periods of extreme heat that threaten health and infrastructure — is rated for 10 of 10 New Hampshire counties in FEMA's National Risk Index. Hillsborough County carries the state's highest heat wave score at 75.4, with $2M in expected annual heat wave losses.
No New Hampshire county reaches the High band for heat wave, and expected annual losses from heat wave total roughly $6M statewide. The full ranking below links to each county's complete 18-hazard risk profile.
County Rankings — Heat Wave
| # | County | Heat Wave Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Hillsborough County | Low | 3.76 / yr | $2M | |
| 2 | Merrimack County | Low | 3.42 / yr | $1M | |
| 3 | Rockingham County | Low | 4.22 / yr | $1M | |
| 4 | Cheshire County | Low | 2.90 / yr | $513K | |
| 5 | Strafford County | Low | 3.64 / yr | $442K | |
| 6 | Sullivan County | Low | 2.11 / yr | $361K | |
| 7 | Grafton County | Low | 1.01 / yr | $310K | |
| 8 | Belknap County | Low | 2.53 / yr | $315K | |
| 9 | Carroll County | Very Low | 1.92 / yr | $179K | |
| 10 | Coos County | Very Low | 0.31 / yr | $24K |
10 New Hampshire counties with measurable heat wave risk. See the national heat wave ranking or all New Hampshire counties by overall risk.
Frequently Asked Questions
Which New Hampshire county has the highest heat wave risk?
Hillsborough County has the highest FEMA heat wave risk score in New Hampshire at 75.4 (Low), with $2M in expected annual losses and about 3.76 events per year.
How many New Hampshire counties face significant heat wave risk?
10 New Hampshire counties record measurable heat wave risk in FEMA's National Risk Index; 0 of them are rated High or Very High.