Hillsborough County, New Hampshire tornadoes

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20confirmed tornadoes since NOAA records began in 1950 (the first here in 1956). Most recent: May 31, 1998, F2. 2026 so far: 0 preliminary reports preliminary

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Map

Every tornado path in the county

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(E)F0(E)F1(E)F2(E)F3(E)F4(E)F5Unrated

Each path is a straight line from where the tornado started to where it ended, which is all most NOAA records hold. Tap a path for its details.

The record

At a glance

Total201950 to 2025
Per year0.3average since 1950
Peak monthJuly9 of 20
StrongestF3May 20, 1963
Deaths0whole paths, see note
Injuries1whole paths, see note

Deaths and injuries are NOAA's totals for each tornado's whole path, which can extend beyond Hillsborough County.

Seasons

When tornadoes hit here

By month

90 Jan: 0Feb: 0Mar: 0Apr: 0May: 4Jun: 4Jul: 9Aug: 3Sep: 0Oct: 0Nov: 0Dec: 0JanFebMarAprMayJunJulAugSepOctNovDec

July is the peak month, with 9 of 20 tornadoes.

By time of day

50 12 AM: 0: 0: 03 AM: 0: 0: 06 AM: 0: 0: 09 AM: 0: 1: 012 PM: 0: 3: 33 PM: 5: 3: 46 PM: 1: 0: 09 PM: 0: 0: 012 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM

Most often around 3:00 PM. Times as recorded by NOAA, mostly Central Standard Time.

By year, 1950 to 2025

40 1950: 0: 0: 0: 0: 0: 0: 1: 0: 0: 01960: 0: 2: 0: 4: 0: 1: 1: 0: 3: 01970: 1: 0: 1: 0: 0: 0: 0: 0: 1: 01980: 0: 0: 0: 0: 2: 0: 1: 0: 0: 01990: 0: 0: 0: 0: 0: 0: 0: 1: 1: 02000: 0: 0: 0: 0: 0: 0: 0: 0: 0: 02010: 0: 0: 0: 0: 0: 0: 0: 0: 0: 02020: 0: 0: 0: 0: 0: 019501960197019801990200020102020

The line is the five-year average. Tornadoes before about 1953 were under-reported, and better radar since the 1990s finds more weak ones.

By rating

EF0
1
EF1
12
EF2
5
EF3
2

Ratings before February 2007 use the original F scale; the numbers line up with today's EF scale. Unknown means NOAA could not assign a rating.

The record

Notable tornadoes

Strongest

F3, May 20, 1963

14 mile path Longest path

14 miles, F3

May 20, 1963, whole path Widest

400 yards, F1

July 19, 1966
Every tornado

All 20 tornadoes, newest first

DateRatingPath lengthWidthDeathsInjuries
May 31, 1998F20.5 mi90 yd00
Jul 3, 1997F22 mi250 yd00
Jun 16, 1986F112 mi30 yd00
Jul 5, 1984F17 mi20 yd00
Jul 5, 1984F10.1 mi10 yd00
Jun 19, 1978F01.5 mi100 yd00
Jul 19, 1972F10.9 mi40 yd00
Jul 16, 1970F10.2 mi17 yd00
Aug 20, 1968F31 mi27 yd01
Aug 20, 1968F12.5 mi17 yd00
Jul 17, 1968F20.1 mi17 yd00
Jul 19, 1966F10.2 mi400 yd00
Aug 28, 1965F10.3 mi40 yd00
Jun 9, 1963F210 mi77 yd00
May 20, 1963F18.5 mi77 yd00
May 20, 1963F314 mi100 yd00
May 9, 1963F110.1 mi20 yd00
Jul 21, 1961F12 mi17 yd00
Jul 2, 1961F22 mi17 yd00
Jun 27, 1956F12 mi17 yd00
Nearby

Nearby counties

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Source: NOAA Storm Prediction Center severe weather database, 1950 to 2025, and SPC preliminary reports for 2026. Page built October 12, 2026.