Rockingham County, New Hampshire: Natural Disaster Risk and History
Rockingham County, New Hampshire has a Relatively Moderate natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 85.8 out of 100, higher than about 85% of US counties, with coastal flooding, ice storms and inland (river and flash) flooding scoring highest of its 18 hazards and $90 million a year in expected losses.
OpenFEMA lists 33 federal disaster declarations that included Rockingham County since 1972, not counting 2 for COVID-19; the latest is DR-4799-NH (Severe Winter Storm and Flooding, declared 10 July 2024). NOAA's Storm Prediction Center recorded 11 tornadoes touching Rockingham County from 1950 to 2025.
Live weather alerts for New Hampshire All official warnings Latest FEMA declarations
Population 314,137 Buildings worth $65 billion Area 803 sq mi Risk rank in New Hampshire 2 of 10 FIPS 33015
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Coastal flooding | Relatively High | 92.8 | $12 million | about 8 a year | — |
| Ice storm | Relatively High | 91.3 | $1.6 million | about 2 a year | 127 |
| Inland flooding | Relatively Moderate | 89.1 | $54 million | about 1.2 a year | 34 |
| Earthquake | Relatively Low | 87.5 | $5.5 million | about once every 459 years | — |
| Hurricane | Relatively Moderate | 83.8 | $5.0 million | about once every 7.3 years | 56 |
| Drought | Relatively Moderate | 77.1 | $1.2 million | about 5.6 a year | 266 |
| Lightning | Relatively Moderate | 74.8 | $910,702 | about 2 a year | 108,475 strikes |
| Tornado | Relatively Moderate | 73.5 | $4.4 million | about once every 8.2 years | 7 |
| Strong wind | Relatively Moderate | 72.5 | $1.6 million | about once every 1.2 years | 30 |
| Landslide | Relatively Low | 72.0 | $10,881 | about once every 1.7 years | — |
| Winter weather | Relatively Moderate | 65.6 | $168,796 | about 17 a year | 296 |
| Heat wave | Relatively Low | 65.0 | $1.1 million | about 4.2 a year | 63 |
| Cold wave | Relatively Low | 57.4 | $1.9 million | about 1.4 a year | 24 |
| Wildfire | Very Low | 47.8 | $63,922 | rarer than once in 1,000 years | — |
| Hail | Relatively Low | 35.5 | $226,116 | about 2 a year | 78 |
| Avalanche | Very Low | 4.4 | $3 | about once every 100 years | 0 |
| Tsunami | Insufficient Data | — | — | — | — |
| Volcanic activity | Not Applicable | — | — | — | — |
Score: FEMA's percentile among US counties that face the hazard (higher = more risk). Expected loss: FEMA's modelled average yearly loss to buildings, people (as a statistical value) and crops. How often: FEMA's annualised frequency of the hazard in the county; for some hazards it counts event-days, so it is a rough guide, not a forecast. "Not Applicable" means FEMA does not model that hazard here.
Federal disaster declarations 33
Most common: Severe Storm 12, Snowstorm 6, Flood 5, Hurricane 5.
| Decade | Declarations | Incident types |
|---|---|---|
| 1970s | 3 | Flood ×2, Coastal Storm |
| 1980s | 1 | Flood |
| 1990s | 5 | Severe Storm, Flood, Snowstorm, Coastal Storm, Hurricane |
| 2000s | 10 | Severe Storm ×4, Snowstorm ×4, Severe Ice Storm, Hurricane |
| 2010s | 11 | Severe Storm ×6, Hurricane ×3, Snowstorm, Coastal Storm |
| 2020s | 3 | Winter Storm, Severe Storm, Flood |
The last 10
Widest declarations that included Rockingham County
- Hurricane Sandy (2012, EM-3360-NH): 10 New Hampshire counties designated.
- Severe Storm (2011, EM-3344-NH): 10 New Hampshire counties designated.
- Hurricane Irene (2011, EM-3333-NH): 10 New Hampshire counties designated.
Named storms in its declarations: Hurricane Sandy (2012), Hurricane Irene (2011), Hurricane Katrina (2005), Hurricane Bob (1991).
Not counted above: 2 COVID-19 ("Biological") declarations — in 2020 every US county was included. New Hampshire also had 1 statewide declaration with no county list.
Tornado record since 1950 11
| Tornadoes touching the county | 11 |
|---|---|
| Strongest-rated | (E)F3 ×1 |
| Peak month | June (4) |
| Deadliest | 24 Jul 2008, EF2, 50.5 mi path, 1 killed, 2 injured |
| Longest path | 24 Jul 2008, EF2, 50.5 mi path, 1 killed, 2 injured |
| Most recent | 24 Jul 2008, EF2, 50.5 mi path, 1 killed, 2 injured |
| Deaths / injuries on those paths | 1 / 11 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 2 | 2 | 6 | 1 | 0 | 0 | 0 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 4 | 3 | 2 | 0 | 0 | 2 | 0 | 0 |
Deaths and injuries are for each tornado's whole path, which can run beyond this county. F-scale ratings before February 2007, Enhanced Fujita (EF) after.
How Rockingham County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Rockingham County (this page) | — | Relatively Moderate | 85.8 | Coastal flooding |
| Strafford County | 36 km | Relatively Low | 64.1 | Ice storm |
| Essex County, MA | 38 km | Relatively High | 95.6 | Coastal flooding |
| Hillsborough County | 48 km | Relatively Moderate | 89.8 | Ice storm |
| Merrimack County | 56 km | Relatively Low | 78.2 | Ice storm |
| Middlesex County, MA | 60 km | Relatively High | 96.9 | Ice storm |
Nearest by distance between county centres. Every county in New Hampshire, ranked.
Vulnerability and resilience
| Social vulnerability | Very Low 10.6 |
|---|---|
| Community resilience | Relatively High 78.8 |
| Community risk factor | 0.68 |
| Expected annual loss, all hazards | $90 million |
FEMA scales expected losses up where social vulnerability is high (people who may find it harder to prepare, evacuate or recover) and down where community resilience is high. A factor above 1 raises the risk score. For social vulnerability a high rating is worse; for resilience a high rating is better.
Prepare for Rockingham County's main hazards
- Right now: National Weather Service alerts for New Hampshire · all official warnings on Global Incident Tracker.
- Coastal flooding: Flood safety: why shallow water kills · Hurricanes and storms now
- Ice storm: Power outages now · Carbon monoxide in winter
- Inland flooding: Flood safety: why shallow water kills · Floods recorded
- Your property's flood zone: FEMA Flood Map Service Center ↗ — this page cannot tell you that.
- Official preparedness guidance: Ready.gov ↗ and your county emergency management office.
What this page shows, and what it misses
FEMA's National Risk Index rates a whole county against every other US county; it is a planning-level estimate for nationwide comparison, not a flood-zone map and not a substitute for a local risk assessment or the risk to one home. Declarations are presidential disaster, emergency and fire management declarations that named this county; state declarations and SBA or USDA designations are not included. Tornadoes are counted when the county is one of up to four listed on the track; 670 tornadoes that crossed a state line carry no county list in NOAA's file and are left out.
Federal Emergency Management Agency (FEMA), National Risk Index Dataset: National Risk Index Counties - v1.20.0 (December 2025). Retrieved from https://services.arcgis.com/XG15cJAlne2vxtgt/ArcGIS/rest/services/National_Risk_Index_Counties/FeatureServer/0/query on November 2, 2026, 1:20 PM EST. This product uses the Federal Emergency Management Agency’s National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Federal Emergency Management Agency (FEMA), OpenFEMA Dataset: Disaster Declarations Summaries - v2, retrieved from https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries on November 2, 2026, 1:21 PM EST. This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Tornado records: NOAA/NWS Storm Prediction Center, Severe Weather Database, tornadoes 1950–2025 (https://www.spc.noaa.gov/wcm/data/1950-2025_actual_tornadoes.csv, downloaded 2 November 2026). Public domain; not endorsed by NOAA. Compiled by Global Incident Tracker.
Questions about Rockingham County
What natural disasters is Rockingham County, New Hampshire most at risk from?
Rockingham County, New Hampshire has a Relatively Moderate natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 85.8 out of 100, higher than about 85% of US counties, with coastal flooding, ice storms and inland (river and flash) flooding scoring highest of its 18 hazards and $90 million a year in expected losses.
How many federal disaster declarations has Rockingham County had?
OpenFEMA lists 33 federal disaster declarations that included Rockingham County since 1972, not counting 2 for COVID-19; the latest is DR-4799-NH (Severe Winter Storm and Flooding, declared 10 July 2024). Another 1 New Hampshire declarations were made statewide without a county list.
How many tornadoes have hit Rockingham County?
NOAA's Storm Prediction Center recorded 11 tornadoes touching Rockingham County from 1950 to 2025. The deadliest: 24 Jul 2008, EF2, 50.5 mi path, 1 killed, 2 injured (deaths and injuries are for the whole path).
Is the National Risk Index a flood zone map?
No. The National Risk Index is a planning-level estimate for a whole county, built for nationwide comparison. It does not tell you the flood zone or the risk of a single property: for that, look up the address on FEMA's Flood Map Service Center (msc.fema.gov) and ask your local floodplain manager.