Delaware winter weather risk
New Castle County has the highest winter weather risk in Delaware, scoring 99.5 out of 100 — rated "Very High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | New Castle County | 99.5 | Very High | 0 |
| 2 | Sussex County | 96.7 | Very High | 0 |
| 3 | Kent County | 92.8 | Relatively High | 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 Delaware:
Frequently asked questions
What is the highest winter weather risk county in Delaware?
New Castle County, DE has the highest winter weather risk in Delaware, with a FEMA National Risk Index score of 99.5 out of 100 (rated "Very High").
How many counties in Delaware are rated Very High for winter weather risk?
2 of 3 scored Delaware counties are rated "Very High" for winter weather risk by FEMA's National Risk Index.
What causes winter weather risk in Delaware?
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.