Hail History

Hail history for Waterloo, Wisconsin

NOAA hail reports in and within about 5 km (3 miles) of Waterloo since 1990, with preliminary reports to November 3, 2026.

Readout · Waterloo

Last hail
Apr 14, 2026
1.00 in, quarter size
Hail days, last 5 years
2
since Nov 3, 2021 · 3 reports
Largest ever
2.00 in
hen egg · Mar 27, 1991

18 reports on 17 days since 1990 · #96 of 271 Wisconsin places

Hail map · Waterloo

Waterloo Marshall Lake Mills Deerfield Sun Prairie Cottage Grove Watertown Johnson Creek 10 mi
  • Under 1 in
  • 1–1.75 in
  • 1.75–2.5 in
  • 2.5–4 in
  • 4 in +
  • No size
18 most recent reports with a location; Jefferson County is shaded. Open street map

For homeowners

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What the record says about Waterloo

The latest hail report in and around Waterloo is from April 14, 2026, 1.00 in (quarter size). Since November 3, 2021 there have been 2 separate hail days; the biggest stones in that time were 1.00 in on April 14, 2026.

Over the 20 years 2006–2025, Waterloo logged 5 reports on 5 hail days, about 0.3 reports a year. That is 44% less than the median Wisconsin town on this site (0.5 a year) and ranks #96 of 271 Wisconsin cities and towns on this site for all-time reports. Waterloo accounts for 10% of the 177 reports filed in Jefferson County.

6% 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 2.00 in (hen egg) on March 27, 1991.

The busiest year was 2005, with 3 reports on 3 days. Hail here peaks in March (28% of reports); 44% fall between April and June.

Reports a year 2006–2025 average

  • Waterloo 0.3
  • Jefferson County 5.0
  • Median Wisconsin town on this site 0.5

Hail days 2006–2025

  • Waterloo 5
  • Jefferson County 46
  • Median Wisconsin town on this site 7

Share 2 in or larger of sized reports

  • Waterloo 6%
  • Jefferson County 10%
  • Median Wisconsin town on this site 6%

Hail over time

0123 1990: 1 reports, largest 1.75 in 1990 1991: 1 reports, largest 2.00 in 1992: 1 reports, largest 1.00 in 1995 1999: 1 reports, largest 0.75 in 2000: 1 reports, largest 0.75 in 2000 2001: 2 reports, largest 0.75 in 2004: 1 reports, largest 1.00 in 2005: 3 reports, largest 0.75 in 2005 2006: 1 reports, largest 0.75 in 2007: 1 reports, largest 1.00 in 2008: 1 reports, largest 1.00 in 2010 2012: 1 reports, largest 1.00 in 2015 2020 2023: 1 reports, largest 1.00 in 2025 2026: 2 reports, largest 1.00 in
Reports per year, 1990–2026. Bar colour shows the largest hail that year. Reporting grew sharply after the mid-1990s, so early decades undercount.
0246 Jan Feb March: 5 reports (28%) Mar April: 2 reports (11%) Apr May: 3 reports (17%) May June: 3 reports (17%) Jun July: 3 reports (17%) Jul Aug September: 1 reports (6%) Sep October: 1 reports (6%) Oct Nov Dec
All 18 reports by calendar month.
Reports per month, 2017–2026. Darker cells had more reports.
YearJanFebMarAprMayJunJulAugSepOctNovDecTotal
2026 2 2
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
Apr 14, 2026 2 1.00 in —
Oct 23, 2023 1 1.00 in —

Largest hail on record

Largest hail reports in Waterloo
Date Size Location County Time · source
Mar 27, 1991 2.00 inhen egg — Jefferson 14:10 local · NCEI
Mar 13, 1990 1.75 ingolf ball — Jefferson 18:20 local · NCEI
Apr 14, 2026 1.00 inquarter 0.86 NW Waterloo Jefferson 16:54 local · NCEI
Apr 14, 2026 1.00 inquarter 0.86 NW Waterloo Jefferson 16:48 local · NCEI
Oct 23, 2023 1.00 inquarter 0.5 W Waterloo Jefferson 14:51 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 Waterloo
Date Size Location County Time · source
Apr 14, 2026 1.00 inquarter 0.86 NW Waterloo Jefferson 16:54 local · NCEI
Apr 14, 2026 1.00 inquarter 0.86 NW Waterloo Jefferson 16:48 local · NCEI
Oct 23, 2023 1.00 inquarter 0.5 W Waterloo Jefferson 14:51 local · NCEI
Jul 30, 2012 1.00 inquarter 3 SE Marshall Dane 23:00 local · NCEI
Jun 7, 2008 1.00 inquarter 0.5 N Waterloo Jefferson 15:10 local · NCEI
Jul 9, 2007 1.00 inquarter 0.2 NE Waterloo Jefferson 09:50 local · NCEI
May 17, 2006 0.75 inpenny Waterloo Jefferson 13:15 local · NCEI
May 19, 2005 0.75 inpenny Waterloo Jefferson 15:00 local · NCEI
May 6, 2005 0.75 inpenny 5 W Fond Du Lac Fond Du Lac 16:27 local · NCEI
Mar 30, 2005 0.75 inpenny 4 N Wauwatosa Milwaukee 20:03 local · NCEI
Mar 1, 2004 1.00 inquarter Waterloo Jefferson 15:58 local · NCEI
Sep 3, 2001 0.75 inpenny 2 SE Waterloo Jefferson 14:35 local · NCEI

Hail history near Waterloo

Questions about hail in Waterloo

How often does it hail in Waterloo, Wisconsin?

18 hail reports have been logged in and within about 5 km (3 miles) of Waterloo since 1990. Over the 20 years 2006–2025 that averages 0.3 reports a year. That ranks #96 of 271 Wisconsin places by number of reports.

When is hail season in Waterloo?

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

What is the largest hail recorded in Waterloo?

2.00 in (hen egg size) on March 27, 1991. 6% of reports here were 2 inches or larger.

When did it last hail in Waterloo?

The most recent report in this data is from April 14, 2026 (1.00 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.

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

2 separate days with hail reports since November 3, 2021, adding up to 3 reports. The most recent was April 14, 2026.

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.