Nassau County, New York: hazard risk
FEMA rates Nassau County's overall risk Relatively High (score 97.1 of 100, higher than 97% of rated U.S. counties); 8 of its 15 hazards are rated Relatively High or Very High, led by winter weather, ice storm, coastal flooding. Its storm record holds 977 events since 1950.
FEMA's rating for each hazard
These are FEMA's county-wide model ratings and this county's storm record. They are not an assessment of any property, address or building, and not insurance advice: a property's risk depends on its own elevation, construction and location.
FEMA gives each hazard its own rating, and a rating does not follow the score from one hazard to the next: a hazard with a higher score can carry a lower rating than another. The table sorts by FEMA's rating, then by score (0 to 100, the county against every other county for that hazard).
| Hazard | Risk rating | Score | Expected annual loss |
|---|---|---|---|
| Winter Weather | Very High | 98.9 | $2.0M |
| Ice Storm | Very High | 98.7 | $3.9M |
| Coastal Flooding | Very High | 98.4 | $24M |
| Lightning | Very High | 97.3 | $3.0M |
| Riverine Flooding | Relatively High | 98.2 | $184M |
| Strong Wind | Relatively High | 97.1 | $4.5M |
| Hurricane | Relatively High | 95.4 | $27M |
| Cold Wave | Relatively High | 92.7 | $9.9M |
| Earthquake | Relatively Moderate | 96.5 | $28M |
| Heat Wave | Relatively Moderate | 96.0 | $8.3M |
| Tornado | Relatively Moderate | 76.2 | $3.7M |
| Landslide | Relatively Low | 75.9 | $11K |
| Wildfire | Very Low | 43.6 | $36K |
| Hail | Very Low | 23.4 | $96K |
| Drought | Very Low | 17.5 | $2K |
Source: FEMA National Risk Index, December 2025 release. A model of future loss, not a count of past events. FEMA's National Risk Index map.
What the record holds
| Hazard | Records | Deaths | Damage | Rank in state | Rank in U.S. |
|---|---|---|---|---|---|
| Floods | 289 | 0 | $31M | 2nd of 58 | 11th of 3,080 |
| Severe thunderstorm wind | 250 | 0 | $5.5M | 4th of 58 | 192nd of 3,080 |
| Winter storms | 136 | 10 | – | 12th of 58 | 342nd of 3,077 |
| High wind and dust storms | 105 | 11 | $5.9M | 3rd of 58 | 68th of 3,080 |
| Hail | 81 | 0 | $151K | 4th of 58 | 898th of 3,080 |
| Heavy rain | 23 | 0 | – | 3rd of 58 | 95th of 3,080 |
| Lightning | 23 | 1 | $932K | 2nd of 58 | 65th of 3,080 |
| Rip currents and high surf | 19 | 21 | – | 2nd of 58 | 32nd of 2,080 |
| Hurricanes and tropical storms | 15 | 4 | $10K | 2nd of 58 | 195th of 1,849 |
| Heat | 13 | 2 | – | 16th of 58 | 692nd of 3,076 |
| Tornadoes | 9 | 0 | $4.3M | 2nd of 58 | 1458th of 3,080 |
| Drought | 8 | 0 | – | 4th of 58 | 1389th of 3,063 |
| Extreme cold | 5 | 1 | – | 48th of 58 | 1239th of 3,076 |
Source: NOAA NCEI Storm Events Database, 1950 to 2026-06-30; damage in 2025 dollars. Search the record at NCEI.
The full Nassau County record: every hazard by year and month, the deadliest events and FEMA's declarations.