New Hampshire winter weather risk
Grafton County has the highest winter weather risk in New Hampshire, scoring 93.3 out of 100 — rated "Relatively High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Grafton County | 93.3 | Relatively High | 0 |
| 2 | Carroll County | 89.8 | Relatively High | 0 |
| 3 | Coos County | 88.4 | Relatively High | 0 |
| 4 | Hillsborough County | 87.4 | Relatively High | 0 |
| 5 | Merrimack County | 80.4 | Relatively Moderate | 0 |
| 6 | Belknap County | 75.3 | Relatively Moderate | 0 |
| 7 | Rockingham County | 65.6 | Relatively Moderate | 0 |
| 8 | Cheshire County | 50.8 | Relatively Low | 0 |
| 9 | Strafford County | 48.5 | Relatively Low | 0 |
| 10 | Sullivan County | 48.5 | 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.
Winter Weather risk nationally:
Other hazard risks in New Hampshire:
Frequently asked questions
What is the highest winter weather risk county in New Hampshire?
Grafton County, NH has the highest winter weather risk in New Hampshire, with a FEMA National Risk Index score of 93.3 out of 100 (rated "Relatively High").
What causes winter weather risk in New Hampshire?
Winter weather risk captures expected losses from heavy snow, blizzards, and mixed precipitation. Highest scores appear in the Great Lakes snowbelt, northern Rockies, and interior Northeast, where lake-effect and orographic snowfall is frequent. Winter weather impacts transportation networks, utilities, agriculture, and population health.