Arizona winter weather risk
Coconino County has the highest winter weather risk in Arizona, scoring 98.3 out of 100 — rated "Very High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Coconino County | 98.3 | Very High | 0 |
| 2 | Navajo County | 96.8 | Very High | 0 |
| 3 | Yavapai County | 94.3 | Relatively High | 0 |
| 4 | Mohave County | 91.4 | Relatively High | 0 |
| 5 | Apache County | 90.6 | Relatively High | 0 |
| 6 | Gila County | 86 | Relatively High | 0 |
| 7 | Pima County | 80.9 | Relatively Moderate | 0 |
| 8 | Graham County | 73.7 | Relatively Moderate | 0 |
| 9 | Maricopa County | 38.7 | Relatively Low | 0 |
| 10 | Greenlee County | 28.5 | Relatively Low | 0 |
| 11 | Cochise County | 21.3 | Very Low | 0 |
| 12 | Santa Cruz County | 18.9 | Very Low | 0 |
| 13 | Pinal County | 15.6 | Very Low | 0 |
| 14 | La Paz County | 1.3 | Very Low | 0 |
| 15 | Yuma County | 1.1 | Very 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 Arizona:
Frequently asked questions
What is the highest winter weather risk county in Arizona?
Coconino County, AZ has the highest winter weather risk in Arizona, with a FEMA National Risk Index score of 98.3 out of 100 (rated "Very High").
How many counties in Arizona are rated Very High for winter weather risk?
2 of 15 scored Arizona counties are rated "Very High" for winter weather risk by FEMA's National Risk Index.
What causes winter weather risk in Arizona?
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.