New Hampshire

Storm History: Grafton County, New Hampshire

650 episodes, 1,373 events since 1957

Every storm the National Weather Service has filed in Grafton County, New Hampshire: floods, hail, damaging wind, tornadoes, winter storms, heat and the rest, with the most serious on record. Events filed by forecast zone count for every county the zone covers.

The record

Events
1,373
Deaths
7
Injuries
11
Damage
$52 million
Episodes
650

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

Open the live radar over Grafton County

Every year

From 1996 the record holds 48 kinds of event with each office’s narrative; before that, tornadoes, hail and thunderstorm wind only, and before 1955 tornadoes alone.

By kind of event

Counted under the kind that heads each episode.

Kind of eventEventsDeathsInjuriesDamage
Hail30202$21,000
Heavy Snow21800
Thunderstorm Wind19102
Flood15200$10 million
Flash Flood12922$35 million
Winter Storm7210
Tornado5200$438,000
Strong Wind5010$5,000
Winter Weather4420
Drought3700$1.2 million
High Wind3500$151,000
Cold/Wind Chill2900
Extreme Cold/Wind Chill1600
Lightning1005$835,000
Debris Flow810$238,000
Blizzard800
Ice Storm600$3.1 million
Tropical Storm500
Heat400
Heavy Rain200
Coastal Flood200
Frost/Freeze100

The deadliest

The costliest

Damage within this county, in the dollars of its year.

The largest hail

The largest stone in each episode, which may have fallen in a neighboring county of the same episode.

The strongest tornadoes

Every tornado in Grafton County, with its track

Every episode, newest first

Earlier years, state by state:

More

Tornadoes in Grafton CountyEvery warning in Grafton County since 1986Every county in New Hampshire

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24.