Thornton, NH natural hazards
Most of the natural-hazard damage FEMA expects in Thornton comes from inland flooding, and overall the risk is very high for a U.S. community. Flood insurance has paid 31 claims here since 1979. 10 federal disasters brought FEMA money into town.
FEMA National Risk Index, December 2025 · OpenFEMA claims, aid & declarationsHow exposed is Thornton?
FEMA expects yearly storm and flood damage to homes and buildings in Thornton to be higher than in 86% of U.S. communities, mostly from inland flooding.
What Thornton faces
Each hazard’s share of the damage FEMA expects here, and how that compares with the rest of the country.
Inland flooding
Lower here
Not a risk here
Does Thornton flood?
Every paid claim on a federal flood insurance policy in Thornton, from FEMA’s records.
Biggest named events
- Hurricane Irene: 14 claims, $366K
- December Nor'easter: 1 claim, $52K
Homes that flooded again and again
■ FEMA “severe repetitive loss” (1) ■ flooded 2+ times
are insured
are insured
10 federal disasters brought FEMA money here
Disasters the President declared that paid out in Thornton itself: aid to households, or repair grants to the Town of Thornton.
Severe Storms and Flooding
Severe Storm and Flooding
Severe Storms and Flooding
Hurricane Sandy
Tropical Storm Irene
Severe Storms and Flooding
Severe Storms and Flooding
Record Snow
Record And/Or Near Record Snow
Snow
Thornton and the towns around it
How to read this page
FEMA’s expected losses across Thornton total about $1.7M a year, counting buildings, people and crops.
Sources: FEMA National Risk Index (December 2025); OpenFEMA: NFIP redacted claims, multiple-loss properties, community status book and residential penetration rates, housing assistance (owners and renters), public assistance funded projects, hazard mitigation properties and disaster declarations. Census tracts: U.S. Census Bureau.