Hail history for Waterloo, Illinois
NOAA hail reports in and within about 5 km (3 miles) of Waterloo since 1971, with preliminary reports to November 3, 2026.
Readout · Waterloo
- Last hail
- May 27, 2021
- 1.00 in, quarter size
- Hail days, last 5 years
- 0
- since Nov 3, 2021 · 0 reports
- Largest ever
- 1.75 in
- golf ball · Apr 19, 2011
28 reports on 24 days since 1971 · #61 of 378 Illinois places
Hail map · Waterloo
- Under 1 in
- 1–1.75 in
- 1.75–2.5 in
- 2.5–4 in
- 4 in +
- No size
For homeowners
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Send a request to Moxisync Labs for review. The latest hail report in Waterloo is from May 27, 2021. We’re building local roofer coverage. Submitting a request does not guarantee a quote or book an inspection.
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What the record says about Waterloo
The latest hail report in and around Waterloo is from May 27, 2021, 1.00 in (quarter size). There has been no hail report here in the five years since November 3, 2021.
Over the 20 years 2006–2025, Waterloo logged 14 reports on 12 hail days, about 0.7 reports a year. That is 40% more than the median Illinois town on this site (0.5 a year) and ranks #61 of 378 Illinois cities and towns on this site for all-time reports. Waterloo accounts for 23% of the 120 reports filed in Monroe 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 19, 2011 near Waterloo.
Reports were down 73% in 2016–2025 (3) compared with 2006–2015 (11). The busiest year was 2006, with 3 reports on 2 days. Hail here peaks in April (46% of reports); 64% fall between April and June.
Reports a year 2006–2025 average
- Waterloo 0.7
- Monroe County 4.0
- Median Illinois town on this site 0.5
Hail days 2006–2025
- Waterloo 12
- Monroe County 43
- Median Illinois town on this site 8
Share 2 in or larger of sized reports
- Waterloo 0%
- Monroe County 2%
- Median Illinois town on this site 4%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 0 | ||||||||||||
| 2025 | 0 | ||||||||||||
| 2024 | 0 | ||||||||||||
| 2023 | 0 | ||||||||||||
| 2022 | 0 | ||||||||||||
| 2021 | 1 | 1 | |||||||||||
| 2020 | 0 | ||||||||||||
| 2019 | 0 | ||||||||||||
| 2018 | 0 | ||||||||||||
| 2017 | 1 | 1 |
Largest hail on record
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| Apr 19, 2011 | 1.75 ingolf ball | Waterloo | Monroe | 06:04 local · NCEI |
| Apr 19, 1996 | 1.75 ingolf ball | 3 W Waterloo | Monroe | 17:15 local · NCEI |
| Apr 19, 1996 | 1.75 ingolf ball | 4 N Waterloo | Monroe | 17:10 local · NCEI |
| Aug 3, 1991 | 1.75 ingolf ball | — | Monroe | 14:10 local · NCEI |
| Jul 26, 1976 | 1.75 ingolf ball | — | Monroe | 20:20 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
- Under 1 in 14 50%
- 1–2 in 14 50%
- 2 in + 0 0%
Most recent reports
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| May 27, 2021 | 1.00 inquarter | Waterloo | Monroe | 13:54 local · NCEI |
| Feb 28, 2017 | 0.88 innickel | Waterloo | Monroe | 18:25 local · NCEI |
| May 11, 2016 | 1.00 inquarter | Waterloo | Monroe | 13:24 local · NCEI |
| Apr 2, 2014 | 1.50 inping pong ball | 0.76 W Waterloo | Monroe | 10:05 local · NCEI |
| Apr 28, 2012 | 1.50 inping pong ball | 1.55 NNE Burksville | Monroe | 20:01 local · NCEI |
| Jun 21, 2011 | 1.00 inquarter | 1.28 ENE Foster Pond | Monroe | 13:55 local · NCEI |
| Apr 19, 2011 | 1.75 ingolf ball | Waterloo | Monroe | 06:04 local · NCEI |
| Dec 31, 2010 | 0.88 innickel | Waterloo | Monroe | 12:17 local · NCEI |
| Apr 22, 2008 | 0.75 inpenny | Waterloo | Monroe | 08:11 local · NCEI |
| Apr 3, 2007 | 0.88 innickel | Waterloo | Monroe | 13:05 local · NCEI |
| Apr 3, 2007 | 0.75 inpenny | Waterloo | Monroe | 12:25 local · NCEI |
| Jun 28, 2006 | 0.75 inpenny | Waterloo | Monroe | 22:40 local · NCEI |
Hail history near Waterloo
Questions about hail in Waterloo
How often does it hail in Waterloo, Illinois?
28 hail reports have been logged in and within about 5 km (3 miles) of Waterloo since 1971. Over the 20 years 2006–2025 that averages 0.7 reports a year. That ranks #61 of 378 Illinois places by number of reports.
When is hail season in Waterloo?
Most reports come in April, February, May. April alone accounts for 46% of all reports.
What is the largest hail recorded in Waterloo?
1.75 in (golf ball size) on April 19, 2011 near Waterloo. 0% of reports here were 2 inches or larger.
When did it last hail in Waterloo?
The most recent report in this data is from May 27, 2021 (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?
None: there has been no hail report in and within about 5 km (3 miles) of Waterloo since November 3, 2021. The last one was on May 27, 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.