Hail History

Hail history for Mason City, Iowa

NOAA hail reports in and within about 5 km (3 miles) of Mason City since 1959, with preliminary reports to November 3, 2026.

Readout · Mason City

Last hail
Apr 28, 2025
0.88 in, nickel size
Hail days, last 5 years
4
since Nov 3, 2021 · 9 reports
Largest ever
3.00 in
teacup · Jun 18, 1974

71 reports on 48 days since 1959 · #13 of 483 Iowa places

Hail map · Mason City

Mason City Clear Lake Nora Springs Rockwell Rockford Rudd 5 mi
  • Under 1 in
  • 1–1.75 in
  • 1.75–2.5 in
  • 2.5–4 in
  • 4 in +
  • No size
71 most recent reports with a location; Cerro Gordo County is shaded. Open street map

For homeowners

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What the record says about Mason City

The latest hail report in and around Mason City is from April 28, 2025, 0.88 in (nickel size). Since November 3, 2021 there have been 4 separate hail days; the biggest stones in that time were 1.00 in on October 24, 2024.

Over the 20 years 2006–2025, Mason City logged 41 reports on 28 hail days, about 2.0 reports a year. That is 4.6 times the median Iowa town on this site (0.5 a year) and ranks #13 of 483 Iowa cities and towns on this site for all-time reports. Mason City accounts for 39% of the 184 reports filed in Cerro Gordo County.

1% 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 3.00 in (teacup) on June 18, 1974.

Reports were up 16% in 2016–2025 (22) compared with 2006–2015 (19). The busiest year was 2002, with 9 reports on 1 day. Hail here peaks in June (28% of reports); 65% fall between April and June.

Reports a year 2006–2025 average

  • Mason City 2.0
  • Cerro Gordo County 5.1
  • Median Iowa town on this site 0.5

Hail days 2006–2025

  • Mason City 28
  • Cerro Gordo County 47
  • Median Iowa town on this site 7

Share 2 in or larger of sized reports

  • Mason City 1%
  • Cerro Gordo County 2%
  • Median Iowa town on this site 6%

Hail over time

0369 1959: 1 reports, largest 1.00 in 1960 1963: 1 reports, largest 1.50 in 1968: 1 reports, largest 1.00 in 1970 1974: 1 reports, largest 3.00 in 1980: 1 reports, largest 1.75 in 1980 1984: 1 reports, largest 0.75 in 1990 1991: 2 reports, largest 1.50 in 1992: 1 reports, largest 0.75 in 1998: 2 reports, largest 1.00 in 1999: 2 reports, largest 0.75 in 2000 2001: 2 reports, largest 0.88 in 2002: 9 reports, largest 1.75 in 2003: 2 reports, largest 1.75 in 2004: 2 reports, largest 1.00 in 2005: 2 reports, largest 1.00 in 2006: 3 reports, largest 1.00 in 2008: 4 reports, largest 1.75 in 2010 2011: 3 reports, largest 1.75 in 2012: 3 reports, largest 1.00 in 2013: 6 reports, largest 1.50 in 2016: 2 reports, largest 1.00 in 2017: 4 reports, largest 1.25 in 2018: 4 reports, largest 1.00 in 2019: 1 reports, largest 0.88 in 2020: 2 reports, largest 1.00 in 2020 2022: 1 reports, largest 1.00 in 2023: 3 reports, largest 1.00 in 2024: 4 reports, largest 1.00 in 2025: 1 reports, largest 0.88 in
Reports per year, 1959–2026. Bar colour shows the largest hail that year. Reporting grew sharply after the mid-1990s, so early decades undercount.
05101520 Jan Feb March: 5 reports (7%) Mar April: 8 reports (11%) Apr May: 18 reports (25%) May June: 20 reports (28%) Jun July: 9 reports (13%) Jul August: 1 reports (1%) Aug September: 1 reports (1%) Sep October: 9 reports (13%) Oct Nov Dec
All 71 reports by calendar month.
Reports per month, 2017–2026. Darker cells had more reports.
YearJanFebMarAprMayJunJulAugSepOctNovDecTotal
2026 0
2025 1 1
2024 4 4
2023 3 3
2022 1 1
2021 0
2020 11 2
2019 1 1
2018 1111 4
2017 31 4

Hail days since Nov 3, 2021

DateReportsLargestStorm page
Apr 28, 2025 1 0.88 in —
Oct 24, 2024 4 1.00 in —
Mar 31, 2023 3 1.00 in —
Apr 12, 2022 1 1.00 in —

Largest hail on record

Largest hail reports in Mason City
Date Size Location County Damage Time · source
Jun 18, 1974 3.00 inteacup — Cerro Gordo — 18:30 local · NCEI
Jun 14, 2011 1.75 ingolf ball 0.86 SW Central Hgts Cerro Gordo $5K 04:10 local · NCEI
May 25, 2008 1.75 ingolf ball 1.47 SSE Mason City Cerro Gordo $10K 15:26 local · NCEI
Jul 31, 2003 1.75 ingolf ball Mason City Cerro Gordo $25K 21:32 local · NCEI
Jun 19, 2002 1.75 ingolf ball Mason City Cerro Gordo $100K 03:12 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 Mason City
Date Size Location County Time · source
Apr 28, 2025 0.88 innickel 1.47 NNW Mason City Cerro Gordo 20:37 local · NCEI
Oct 24, 2024 0.88 innickel 0.86 SE Mason City Cerro Gordo 16:05 local · NCEI
Oct 24, 2024 1.00 inquarter Mason City Cerro Gordo 16:02 local · NCEI
Oct 24, 2024 0.88 innickel 0.86 NE Mason City Cerro Gordo 16:02 local · NCEI
Oct 24, 2024 0.88 innickel Central Hgts Cerro Gordo 15:57 local · NCEI
Mar 31, 2023 1.00 inquarter Mason City Cerro Gordo 14:49 local · NCEI
Mar 31, 2023 1.00 inquarter 1.38 S Mason City Cerro Gordo 14:44 local · NCEI
Mar 31, 2023 0.88 innickel 2.62 WSW Hanford Cerro Gordo 14:35 local · NCEI
Apr 12, 2022 1.00 inquarter 1.38 N Mason City Cerro Gordo 19:50 local · NCEI
Jul 11, 2020 1.00 inquarter 1.38 N Mason City Cerro Gordo 15:02 local · NCEI
Jun 21, 2020 0.75 inpenny 0.5 E Winnebago Hgts Cerro Gordo 18:12 local · NCEI
Jun 4, 2019 0.88 innickel 1.38 N Mason City Cerro Gordo 23:06 local · NCEI

Hail history near Mason City

Questions about hail in Mason City

How often does it hail in Mason City, Iowa?

71 hail reports have been logged in and within about 5 km (3 miles) of Mason City since 1959. Over the 20 years 2006–2025 that averages 2.0 reports a year. That ranks #13 of 483 Iowa places by number of reports.

When is hail season in Mason City?

Most reports come in June, May, July. June alone accounts for 28% of all reports.

What is the largest hail recorded in Mason City?

3.00 in (teacup size) on June 18, 1974. 1% of reports here were 2 inches or larger.

When did it last hail in Mason City?

The most recent report in this data is from April 28, 2025 (0.88 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.

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

4 separate days with hail reports since November 3, 2021, adding up to 9 reports. The most recent was April 28, 2025.

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.