St. Lawrence County
New York — Natural Disaster Risk Assessment
LowComposite Risk Score
National percentile: 78th
St. Lawrence County faces low composite natural disaster risk (NRI Risk Index score 77.9, 78th national percentile), driven primarily by cold wave and ice storm exposure. Expected annual loss across all 18 hazard types is $32M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Cold Wave | Medium | 4.63 / yr | $5M |
| Ice Storm | High | 0.66 / yr | $606K |
| Winter Weather | High | 19.69 / yr | $274K |
| Earthquake | Low | 0.00 / yr | $3M |
| Riverine Flood | Medium | 0.96 / yr | $22M |
| Lightning | Medium | 23.71 / yr | $547K |
| Landslide | Low | 2.11 / yr | $10K |
| Hurricane | Low | 0.01 / yr | $158K |
| Heat Wave | Very Low | 1.28 / yr | $169K |
| Strong Wind | Low | 0.54 / yr | $294K |
| Wildfire | Very Low | 0.00 / yr | $15K |
| Tornado | Very Low | 0.10 / yr | $285K |
| Avalanche | Very Low | 0.01 / yr | $22 |
| Hail | Very Low | 0.34 / yr | $6K |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Drought | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
| Volcanic Activity | Very Low | 0.00 / yr | $0 |
Frequently Asked Questions
What is the overall natural disaster risk for St. Lawrence County?
St. Lawrence County has a composite FEMA National Risk Index score of 77.9 out of 100, placing it in the Low category and the 78th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in St. Lawrence County?
The three highest-rated hazards are Cold Wave (Medium, $5M EAL), Ice Storm (High, $606K EAL), Winter Weather (High, $274K EAL). These account for most of the county's expected annual losses.
How does St. Lawrence County compare to other New York counties?
St. Lawrence County ranks #25 of 62 New York counties for overall natural disaster risk, with a low rating.
What does Expected Annual Loss (EAL) mean?
EAL is FEMA's estimate of average annual dollar losses from natural hazards, calculated from historical event data and exposure models. St. Lawrence County's $32M EAL is a statistical average, not a guarantee for any specific year or address.