Hail History

Hail history for Riverton, Iowa

NOAA hail reports in and within about 5 km (3 miles) of Riverton since 1964, with preliminary reports to November 3, 2026.

Readout · Riverton

Last hail
Jun 15, 2017
0.88 in, nickel size
Hail days, last 5 years
0
since Nov 3, 2021 · 0 reports
Largest ever
2.00 in
hen egg · May 7, 1964

12 reports on 11 days since 1964 · #379 of 483 Iowa places

Hail map · Riverton

Riverton Farragut Sidney Hamburg Shenandoah Thurman Essex 5 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; Fremont 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 Riverton is from June 15, 2017. A local roofer can check and document it at no cost.

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What the record says about Riverton

The latest hail report in and around Riverton is from June 15, 2017, 0.88 in (nickel size). There has been no hail report here in the five years since November 3, 2021.

Over the 20 years 2006–2025, Riverton logged 5 reports on 4 hail days, about 0.3 reports a year. That is 44% less than the median Iowa town on this site (0.5 a year) and ranks #379 of 483 Iowa cities and towns on this site for all-time reports. Riverton accounts for 9% of the 140 reports filed in Fremont County.

8% of reports with a size were 2 inches (hen egg) or larger, against 6% for the median Iowa town on this site. The largest hail on record here is 2.00 in (hen egg) on May 7, 1964.

The busiest year was 2008, with 2 reports on 1 day. Hail here peaks in May (33% of reports); 67% fall between April and June.

Reports a year 2006–2025 average

  • Riverton 0.3
  • Fremont County 3.7
  • Median Iowa town on this site 0.5

Hail days 2006–2025

  • Riverton 4
  • Fremont County 47
  • Median Iowa town on this site 7

Share 2 in or larger of sized reports

  • Riverton 8%
  • Fremont County 9%
  • Median Iowa town on this site 6%

Hail over time

012 1964: 1 reports, largest 2.00 in 1970 1980 1990 1992: 1 reports, largest 1.75 in 1996: 1 reports, largest 1.75 in 1998: 1 reports, largest 1.00 in 2000 2002: 1 reports, largest 1.00 in 2003: 1 reports, largest 0.75 in 2005: 1 reports, largest 1.00 in 2006: 1 reports, largest 0.88 in 2008: 2 reports, largest 0.75 in 2010 2016: 1 reports, largest 0.88 in 2017: 1 reports, largest 0.88 in 2020
Reports per year, 1964–2026. Bar colour shows the largest hail that year. Reporting grew sharply after the mid-1990s, so early decades undercount.
01234 Jan Feb March: 3 reports (25%) Mar Apr May: 4 reports (33%) May June: 4 reports (33%) Jun July: 1 reports (8%) Jul Aug 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 0
2022 0
2021 0
2020 0
2019 0
2018 0
2017 1 1

Largest hail on record

Largest hail reports in Riverton
Date Size Location County Time · source
May 7, 1964 2.00 inhen egg — Fremont 18:30 local · NCEI
May 22, 1996 1.75 ingolf ball Riverton Fremont 21:30 local · NCEI
Jul 29, 1992 1.75 ingolf ball — Fremont 20:35 local · NCEI
Jun 29, 2005 1.00 inquarter 1 E Riverton Fremont 19:45 local · NCEI
Mar 7, 2002 1.00 inquarter Riverton Fremont 23:36 local · NCEI

Sizes filed before 1996 are often rough estimates (round numbers like 7.00 or 8.00 in) without an exact spot; they are shown as NOAA filed them.

Size of every report

Most recent reports

Most recent hail reports in Riverton
Date Size Location County Time · source
Jun 15, 2017 0.88 innickel 1.38 N Riverton Fremont 19:41 local · NCEI
Mar 23, 2016 0.88 innickel 0.69 N Riverton Fremont 16:05 local · NCEI
Jun 20, 2008 0.75 inpenny 0.69 N Riverton Fremont 19:35 local · NCEI
Jun 20, 2008 0.75 inpenny 2.6 NW Riverton Fremont 19:35 local · NCEI
Mar 30, 2006 0.88 innickel Riverton Fremont 16:10 local · NCEI
Jun 29, 2005 1.00 inquarter 1 E Riverton Fremont 19:45 local · NCEI
May 4, 2003 0.75 inpenny 2 E Riverton Fremont 03:03 local · NCEI
Mar 7, 2002 1.00 inquarter Riverton Fremont 23:36 local · NCEI
May 19, 1998 1.00 inquarter Riverton Fremont 08:10 local · NCEI
May 22, 1996 1.75 ingolf ball Riverton Fremont 21:30 local · NCEI
Jul 29, 1992 1.75 ingolf ball — Fremont 20:35 local · NCEI
May 7, 1964 2.00 inhen egg — Fremont 18:30 local · NCEI

Hail history near Riverton

Questions about hail in Riverton

How often does it hail in Riverton, Iowa?

12 hail reports have been logged in and within about 5 km (3 miles) of Riverton since 1964. Over the 20 years 2006–2025 that averages 0.3 reports a year. That ranks #379 of 483 Iowa places by number of reports.

When is hail season in Riverton?

Most reports come in May, June, March. May alone accounts for 33% of all reports.

What is the largest hail recorded in Riverton?

2.00 in (hen egg size) on May 7, 1964. 8% of reports here were 2 inches or larger.

When did it last hail in Riverton?

The most recent report in this data is from June 15, 2017 (0.88 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.

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

None: there has been no hail report in and within about 5 km (3 miles) of Riverton since November 3, 2021. The last one was on June 15, 2017.

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.