Hail History

Hail history for Alton, New Hampshire

NOAA hail reports in and within about 5 km (3 miles) of Alton since 1987, with preliminary reports to November 3, 2026.

Readout · Alton

Last hail
Sep 8, 2023
1.00 in, quarter size
Hail days, last 5 years
1
since Nov 3, 2021 · 1 report
Largest ever
1.75 in
golf ball · Jun 20, 2006

12 reports on 10 days since 1987 · #17 of 22 New Hampshire places

Hail map · Alton

Alton Laconia Rochester Meredith Franklin Bristol 10 mi
  • Under 1 in
  • 1–1.75 in
  • 1.75–2.5 in
  • 2.5–4 in
  • 4 in +
  • No size
12 most recent reports with a location; Belknap County is shaded. Open street map

For homeowners

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Hail bruises shingles and cracks seals in ways you can't see from the ground, and most insurers set a claim deadline after the storm. The latest hail report in Alton is from September 8, 2023. A local roofer can check and document it at no cost.

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What the record says about Alton

The latest hail report in and around Alton is from September 8, 2023, 1.00 in (quarter size). Since November 3, 2021 there has been one hail day; the biggest stones in that time were 1.00 in on September 8, 2023.

Over the 20 years 2006–2025, Alton logged 11 reports on 9 hail days, about 0.6 reports a year. That is 21% less than the median New Hampshire town on this site (0.7 a year) and ranks #17 of 22 New Hampshire cities and towns on this site for all-time reports. Alton accounts for 19% of the 64 reports filed in Belknap County.

0% of reports with a size were 2 inches (hen egg) or larger, against 0% for the median New Hampshire town on this site. The largest hail on record here is 1.75 in (golf ball) on June 20, 2006 near Alton.

Reports were down 90% in 2016–2025 (1) compared with 2006–2015 (10). The busiest year was 2007, with 3 reports on 2 days. Hail here peaks in June (58% of reports); 58% fall between April and June.

Reports a year 2006–2025 average

  • Alton 0.6
  • Belknap County 2.5
  • Median New Hampshire town on this site 0.7

Hail days 2006–2025

  • Alton 9
  • Belknap County 28
  • Median New Hampshire town on this site 8

Share 2 in or larger of sized reports

  • Alton 0%
  • Belknap County 2%
  • Median New Hampshire town on this site 0%

Hail over time

0123 1987: 1 reports, largest 0.75 in 1990 1995 2000 2005 2006: 3 reports, largest 1.75 in 2007: 3 reports, largest 0.75 in 2009: 1 reports, largest 0.88 in 2010 2011: 1 reports, largest 1.00 in 2012: 1 reports, largest 0.75 in 2015: 1 reports, largest 1.00 in 2015 2020 2023: 1 reports, largest 1.00 in 2025
Reports per year, 1987–2026. Bar colour shows the largest hail that year. Reporting grew sharply after the mid-1990s, so early decades undercount.
02468 Jan Feb Mar Apr May June: 7 reports (58%) Jun July: 3 reports (25%) Jul Aug September: 2 reports (17%) Sep Oct Nov Dec
All 12 reports by calendar month.
Reports per month, 2017–2026. Darker cells had more reports.
YearJanFebMarAprMayJunJulAugSepOctNovDecTotal
2026 0
2025 0
2024 0
2023 1 1
2022 0
2021 0
2020 0
2019 0
2018 0
2017 0

Hail days since Nov 3, 2021

DateReportsLargestStorm page
Sep 8, 2023 1 1.00 in —

Largest hail on record

Largest hail reports in Alton
Date Size Location County Time · source
Jun 20, 2006 1.75 ingolf ball Alton Belknap 18:28 local · NCEI
Sep 8, 2023 1.00 inquarter 1.71 NW Alton Bay Belknap 15:25 local · NCEI
Jul 19, 2015 1.00 inquarter Alton Belknap 15:55 local · NCEI
Jul 26, 2011 1.00 inquarter Alton Belknap 16:30 local · NCEI
Jun 26, 2009 0.88 innickel 1.71 SW Alton Belknap 13:30 local · NCEI

Size of every report

Most recent reports

Most recent hail reports in Alton
Date Size Location County Time · source
Sep 8, 2023 1.00 inquarter 1.71 NW Alton Bay Belknap 15:25 local · NCEI
Jul 19, 2015 1.00 inquarter Alton Belknap 15:55 local · NCEI
Jun 8, 2012 0.75 inpenny 0.69 N New Durham Strafford 20:20 local · NCEI
Jul 26, 2011 1.00 inquarter Alton Belknap 16:30 local · NCEI
Jun 26, 2009 0.88 innickel 1.71 SW Alton Belknap 13:30 local · NCEI
Jul 6, 2007 0.75 inpenny New Durham Strafford 13:46 local · NCEI
Jun 5, 2007 0.75 inpenny Alton Belknap 13:13 local · NCEI
Jun 5, 2007 0.75 inpenny Alton Belknap 12:59 local · NCEI
Sep 9, 2006 0.75 inpenny Alton Belknap 16:20 local · NCEI
Jun 20, 2006 0.75 inpenny Alton Bay Belknap 18:45 local · NCEI
Jun 20, 2006 1.75 ingolf ball Alton Belknap 18:28 local · NCEI
Jun 13, 1987 0.75 inpenny — Belknap 15:35 local · NCEI

Hail history near Alton

Questions about hail in Alton

How often does it hail in Alton, New Hampshire?

12 hail reports have been logged in and within about 5 km (3 miles) of Alton since 1987. Over the 20 years 2006–2025 that averages 0.6 reports a year. That ranks #17 of 22 New Hampshire places by number of reports.

When is hail season in Alton?

Most reports come in June, July, September. June alone accounts for 58% of all reports.

What is the largest hail recorded in Alton?

1.75 in (golf ball size) on June 20, 2006 near Alton. 0% of reports here were 2 inches or larger.

When did it last hail in Alton?

The most recent report in this data is from September 8, 2023 (1.00 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.

How many hail storms has Alton had in the last five years?

1 separate days with hail reports since November 3, 2021, adding up to 1 reports. The most recent was September 8, 2023.

Where does this hail data come from?

Hail reports come from the NOAA NCEI Storm Events Database, which the National Weather Service compiles from spotter, public, law enforcement and media reports. Recent days use preliminary NWS Local Storm Reports via the Iowa Environmental Mesonet until NOAA publishes final data. Only reported hail is counted, so areas with fewer people tend to have fewer reports.