Hail History

Hail history for Mazon, Illinois

NOAA hail reports in and within about 5 km (3 miles) of Mazon since 1980, with preliminary reports to November 3, 2026.

Readout · Mazon

Last hail
Apr 30, 2022
1.00 in, quarter size
Hail days, last 5 years
1
since Nov 3, 2021 · 1 report
Largest ever
1.75 in
golf ball · Apr 10, 1999

11 reports on 11 days since 1980 · #295 of 378 Illinois places

Hail map · Mazon

Mazon Coal City Morris Marseilles Wilmington Channahon Minooka 10 mi
  • Under 1 in
  • 1–1.75 in
  • 1.75–2.5 in
  • 2.5–4 in
  • 4 in +
  • No size
11 most recent reports with a location; Grundy County is shaded. Open street map

For homeowners

Concerned about your roof after hail?

Send a request to Moxisync Labs for review. The latest hail report in Mazon is from April 30, 2022. We’re building local roofer coverage. Submitting a request does not guarantee a quote or book an inspection.

Phone line opening soon

What would a claim cost you? Try the hail claim calculator

Roofer? Get hail alerts for your area with StormScope

What the record says about Mazon

The latest hail report in and around Mazon is from April 30, 2022, 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 April 30, 2022.

Over the 20 years 2006–2025, Mazon logged 5 reports on 5 hail days, about 0.3 reports a year. That is about half the median Illinois town on this site (0.5 a year) and ranks #295 of 378 Illinois cities and towns on this site for all-time reports. Mazon accounts for 14% of the 77 reports filed in Grundy County.

0% of reports with a size were 2 inches (hen egg) or larger, against 4% for the median Illinois town on this site. The largest hail on record here is 1.75 in (golf ball) on April 10, 1999 near Mazon.

The busiest year was 1991, with 2 reports on 2 days. Hail here peaks in June (27% of reports); 64% fall between April and June.

Reports a year 2006–2025 average

  • Mazon 0.3
  • Grundy County 2.1
  • Median Illinois town on this site 0.5

Hail days 2006–2025

  • Mazon 5
  • Grundy County 26
  • Median Illinois town on this site 8

Share 2 in or larger of sized reports

  • Mazon 0%
  • Grundy County 1%
  • Median Illinois town on this site 4%

Hail over time

012 1980: 1 reports, largest 1.75 in 1980 1990: 1 reports, largest 1.00 in 1990 1991: 2 reports, largest 0.75 in 1999: 1 reports, largest 1.75 in 2000 2003: 1 reports, largest 1.00 in 2006: 1 reports, largest 0.88 in 2008: 1 reports, largest 1.00 in 2010 2013: 1 reports, largest 1.00 in 2019: 1 reports, largest 1.00 in 2020 2022: 1 reports, largest 1.00 in
Reports per year, 1980–2026. Bar colour shows the largest hail that year. Reporting grew sharply after the mid-1990s, so early decades undercount.
0123 Jan Feb March: 2 reports (18%) Mar April: 2 reports (18%) Apr May: 2 reports (18%) May June: 3 reports (27%) Jun July: 2 reports (18%) Jul Aug Sep Oct Nov Dec
All 11 reports by calendar month.
Reports per month, 2017–2026. Darker cells had more reports.
YearJanFebMarAprMayJunJulAugSepOctNovDecTotal
2026 0
2025 0
2024 0
2023 0
2022 1 1
2021 0
2020 0
2019 1 1
2018 0
2017 0

Hail days since Nov 3, 2021

DateReportsLargestStorm page
Apr 30, 2022 1 1.00 in —

Largest hail on record

Largest hail reports in Mazon
Date Size Location County Time · source
Apr 10, 1999 1.75 ingolf ball Mazon Grundy 15:26 local · NCEI
Jun 1, 1980 1.75 ingolf ball — Grundy 20:10 local · NCEI
Apr 30, 2022 1.00 inquarter Mazon Grundy 15:03 local · NCEI
Mar 14, 2019 1.00 inquarter 2 N Mazon Grundy 10:40 local · NCEI
Jun 12, 2013 1.00 inquarter Mazon Grundy 19:04 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 Mazon
Date Size Location County Time · source
Apr 30, 2022 1.00 inquarter Mazon Grundy 15:03 local · NCEI
Mar 14, 2019 1.00 inquarter 2 N Mazon Grundy 10:40 local · NCEI
Jun 12, 2013 1.00 inquarter Mazon Grundy 19:04 local · NCEI
May 30, 2008 1.00 inquarter 0.86 NE Mazon Grundy 17:42 local · NCEI
Mar 12, 2006 0.88 innickel 1 N Mazon Grundy 17:05 local · NCEI
Jul 6, 2003 1.00 inquarter Mazon Grundy 13:53 local · NCEI
Apr 10, 1999 1.75 ingolf ball Mazon Grundy 15:26 local · NCEI
Jul 7, 1991 0.75 inpenny — Grundy 16:55 local · NCEI
May 14, 1991 0.75 inpenny — Grundy 07:20 local · NCEI
Jun 21, 1990 1.00 inquarter — Grundy 15:30 local · NCEI
Jun 1, 1980 1.75 ingolf ball — Grundy 20:10 local · NCEI

Hail history near Mazon

Questions about hail in Mazon

How often does it hail in Mazon, Illinois?

11 hail reports have been logged in and within about 5 km (3 miles) of Mazon since 1980. Over the 20 years 2006–2025 that averages 0.3 reports a year. That ranks #295 of 378 Illinois places by number of reports.

When is hail season in Mazon?

Most reports come in June, March, April. June alone accounts for 27% of all reports.

What is the largest hail recorded in Mazon?

1.75 in (golf ball size) on April 10, 1999 near Mazon. 0% of reports here were 2 inches or larger.

When did it last hail in Mazon?

The most recent report in this data is from April 30, 2022 (1.00 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.

How many hail storms has Mazon 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 April 30, 2022.

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.