Hail History

Hail history for Mercer, Wisconsin

NOAA hail reports in and within about 5 km (3 miles) of Mercer since 2002, with preliminary reports to November 3, 2026.

Readout · Mercer

Last hail
Aug 10, 2021
0.75 in, penny size
Hail days, last 5 years
0
since Nov 3, 2021 · 0 reports
Largest ever
1.75 in
golf ball · Apr 18, 2002

23 reports on 11 days since 2002 · #51 of 271 Wisconsin places

Hail map · Mercer

Mercer Boulder Junction Butternut 10 mi
  • Under 1 in
  • 1–1.75 in
  • 1.75–2.5 in
  • 2.5–4 in
  • 4 in +
  • No size
23 most recent reports with a location; Iron County is shaded. Open street map

For homeowners

Roof damage after hail? Get a free inspection

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 Mercer is from August 10, 2021. A local roofer can check and document it at no cost.

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What the record says about Mercer

The latest hail report in and around Mercer is from August 10, 2021, 0.75 in (penny size). There has been no hail report here in the five years since November 3, 2021.

Over the 20 years 2006–2025, Mercer logged 22 reports on 10 hail days, about 1.1 reports a year. That is about twice the median Wisconsin town on this site (0.5 a year) and ranks #51 of 271 Wisconsin cities and towns on this site for all-time reports. Mercer accounts for 57% of the 40 reports filed in Iron County.

0% of reports with a size were 2 inches (hen egg) or larger, against 6% for the median Wisconsin town on this site. The largest hail on record here is 1.75 in (golf ball) on April 18, 2002 near Mercer.

Reports were up 20% in 2016–2025 (12) compared with 2006–2015 (10). The busiest year was 2020, with 9 reports on 1 day. Hail here peaks in September (39% of reports); 30% fall between April and June.

Reports a year 2006–2025 average

  • Mercer 1.1
  • Iron County 1.7
  • Median Wisconsin town on this site 0.5

Hail days 2006–2025

  • Mercer 10
  • Iron County 19
  • Median Wisconsin town on this site 7

Share 2 in or larger of sized reports

  • Mercer 0%
  • Iron County 0%
  • Median Wisconsin town on this site 6%

Hail over time

0369 2002: 1 reports, largest 1.75 in 2005 2007: 1 reports, largest 0.75 in 2009: 1 reports, largest 1.00 in 2010: 2 reports, largest 1.00 in 2010 2011: 1 reports, largest 0.75 in 2014: 4 reports, largest 1.00 in 2015: 1 reports, largest 0.75 in 2015 2016: 1 reports, largest 0.88 in 2018: 1 reports, largest 1.00 in 2020: 9 reports, largest 1.25 in 2020 2021: 1 reports, largest 0.75 in 2025
Reports per year, 2002–2026. Bar colour shows the largest hail that year. Reporting grew sharply after the mid-1990s, so early decades undercount.
0369 Jan Feb Mar April: 2 reports (9%) Apr May June: 5 reports (22%) Jun July: 3 reports (13%) Jul August: 4 reports (17%) Aug September: 9 reports (39%) Sep Oct Nov Dec
All 23 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 1 1
2020 9 9
2019 0
2018 1 1
2017 0

Largest hail on record

Largest hail reports in Mercer
Date Size Location County Time · source
Apr 18, 2002 1.75 ingolf ball Mercer Iron 17:20 local · NCEI
Sep 25, 2020 1.25 inhalf dollar 0.84 SE Mercer Iron 20:06 local · NCEI
Sep 25, 2020 1.25 inhalf dollar 0.48 E Mercer Iron 20:05 local · NCEI
Sep 25, 2020 1.25 inhalf dollar 0.48 E Mercer Iron 20:04 local · NCEI
Sep 25, 2020 1.00 inquarter 0.48 E Mercer Iron 20:10 local · NCEI

Size of every report

Most recent reports

Most recent hail reports in Mercer
Date Size Location County Time · source
Aug 10, 2021 0.75 inpenny 0.48 E Mercer Iron 11:55 local · NCEI
Sep 25, 2020 0.75 inpenny 0.48 E Mercer Iron 20:12 local · NCEI
Sep 25, 2020 1.00 inquarter 0.48 E Mercer Iron 20:10 local · NCEI
Sep 25, 2020 1.25 inhalf dollar 0.84 SE Mercer Iron 20:06 local · NCEI
Sep 25, 2020 1.25 inhalf dollar 0.48 E Mercer Iron 20:05 local · NCEI
Sep 25, 2020 1.25 inhalf dollar 0.48 E Mercer Iron 20:04 local · NCEI
Sep 25, 2020 1.00 inquarter 0.48 E Mercer Iron 20:03 local · NCEI
Sep 25, 2020 0.75 inpenny 0.48 E Mercer Iron 20:02 local · NCEI
Sep 25, 2020 0.75 inpenny 0.48 E Mercer Iron 20:01 local · NCEI
Sep 25, 2020 0.75 inpenny 0.48 E Mercer Iron 19:48 local · NCEI
Aug 31, 2018 1.00 inquarter 1.59 ENE Mercer Iron 02:56 local · NCEI
Jul 26, 2016 0.88 innickel 1.46 NNE Mercer Iron 17:18 local · NCEI

Hail history near Mercer

Questions about hail in Mercer

How often does it hail in Mercer, Wisconsin?

23 hail reports have been logged in and within about 5 km (3 miles) of Mercer since 2002. Over the 20 years 2006–2025 that averages 1.1 reports a year. That ranks #51 of 271 Wisconsin places by number of reports.

When is hail season in Mercer?

Most reports come in September, June, August. September alone accounts for 39% of all reports.

What is the largest hail recorded in Mercer?

1.75 in (golf ball size) on April 18, 2002 near Mercer. 0% of reports here were 2 inches or larger.

When did it last hail in Mercer?

The most recent report in this data is from August 10, 2021 (0.75 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.

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

None: there has been no hail report in and within about 5 km (3 miles) of Mercer since November 3, 2021. The last one was on August 10, 2021.

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.