Hail History

Hail history for Winneshiek County, Iowa

Every NOAA hail report filed in Winneshiek County since 1965, with preliminary National Weather Service reports to November 3, 2026.

Readout · Winneshiek County

Last hail
Aug 16, 2025
1.00 in, quarter size
Hail days, last 5 years
5
since Nov 3, 2021 · 6 reports
Largest ever
4.25 in
grapefruit · Jul 24, 2009

161 reports on 69 days since 1965 · #34 of 100 Iowa counties

Hail map · Winneshiek County

Decorah Calmar Ossian Jackson Junction Ridgeway 10 mi
  • Under 1 in
  • 1–1.75 in
  • 1.75–2.5 in
  • 2.5–4 in
  • 4 in +
  • No size
157 most recent reports with a location. Dot size and colour follow hail size. Open street map

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What the record says about Winneshiek County

The latest hail report in Winneshiek County is from August 16, 2025, 1.00 in (quarter size). Since November 3, 2021 there have been 5 separate hail days; the biggest stones in that time were 1.25 in on June 28, 2022.

Over the 20 years 2006–2025, Winneshiek County logged 75 reports on 31 hail days, about 3.8 reports a year. That is about the same as the median Iowa county (3.7 a year) and ranks #34 of 100 Iowa counties for all-time reports. Winneshiek County holds 1% of all 16,032 hail reports in Iowa.

5% of reports with a size were 2 inches (hen egg) or larger, against 7% for the median Iowa county. The largest hail on record here is 4.25 in (grapefruit) on July 24, 2009 near 3.67 SW Castalia.

Reports were down 83% in 2016–2025 (11) compared with 2006–2015 (64). The busiest year was 2009, with 19 reports on 3 days. Hail here peaks in May (30% of reports); 57% fall between April and June.

Reports a year 2006–2025 average

  • Winneshiek County 3.8
  • Median Iowa county 3.7

Hail days 2006–2025

  • Winneshiek County 31
  • Median Iowa county 39.5

Share 2 in or larger of sized reports

  • Winneshiek County 5%
  • Median Iowa county 7%

Hail over time

05101520 1965: 1 reports, largest 3.50 in 1968: 1 reports, largest 1.00 in 1970 1974: 1 reports, largest 0.75 in 1979: 1 reports, largest 1.50 in 1980: 1 reports, largest 0.75 in 1980 1984: 1 reports, largest 0.75 in 1985: 1 reports, largest 0.75 in 1990 1992: 2 reports, largest 0.75 in 1994: 1 reports, largest 1.00 in 1995: 3 reports, largest 1.00 in 1996: 4 reports, largest 1.75 in 1997: 3 reports, largest 1.75 in 1998: 8 reports, largest 1.75 in 2000: 12 reports, largest 1.50 in 2000 2001: 4 reports, largest 1.00 in 2002: 17 reports, largest 1.75 in 2003: 12 reports, largest 1.00 in 2004: 12 reports, largest 1.75 in 2005: 1 reports, largest 0.75 in 2006: 7 reports, largest 1.75 in 2007: 6 reports, largest 1.00 in 2008: 6 reports, largest 1.00 in 2009: 19 reports, largest 4.25 in 2010 2011: 1 reports, largest 0.88 in 2012: 8 reports, largest 2.00 in 2013: 2 reports, largest 1.00 in 2014: 15 reports, largest 1.75 in 2017: 4 reports, largest 2.00 in 2018: 1 reports, largest 1.00 in 2020 2022: 2 reports, largest 1.25 in 2024: 2 reports, largest 1.00 in 2025: 2 reports, largest 1.00 in
Reports per year, 1965–2026. Bar colour shows the largest hail that year. Reporting grew sharply after the mid-1990s, so early decades undercount.
0204060 Jan Feb March: 1 reports (1%) Mar April: 17 reports (11%) Apr May: 49 reports (30%) May June: 25 reports (16%) Jun July: 42 reports (26%) Jul August: 15 reports (9%) Aug September: 8 reports (5%) Sep October: 4 reports (2%) Oct Nov Dec
All 161 reports by calendar month.
Reports per month, 2017–2026. Darker cells had more reports.
YearJanFebMarAprMayJunJulAugSepOctNovDecTotal
2026 0
2025 11 2
2024 11 2
2023 0
2022 2 2
2021 0
2020 0
2019 0
2018 1 1
2017 4 4

Hail days since Nov 3, 2021

DateReportsLargestStorm page
Aug 16, 2025 1 1.00 in —
Jul 2, 2025 1 1.00 in —
Sep 19, 2024 1 0.88 in —
May 7, 2024 1 1.00 in —
Jun 28, 2022 2 1.25 in —

Largest hail on record

Largest hail reports in Winneshiek County
Date Size Location Damage Time · source
Jul 24, 2009 4.25 ingrapefruit 3.67 SW Castalia $50K 16:36 local · NCEI
Aug 25, 1965 3.50 inteacup — — 19:20 local · NCEI
Jul 24, 2009 2.75 inbaseball 3.67 SW Castalia $964K 16:33 local · NCEI
Jul 24, 2009 2.75 inbaseball 2.02 W Ossian $970K 16:26 local · NCEI
May 15, 2017 2.00 inhen egg 0.5 E Calmar — 17:59 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 Winneshiek County
Date Size Location Damage Time · source
Aug 16, 2025 1.00 inquarter 1.01 E Calmar — 00:13 local · NCEI
Jul 2, 2025 1.00 inquarter 2.44 SE Bluffton — 17:52 local · NCEI
Sep 19, 2024 0.88 innickel 1.71 SE Burr Oak — 17:20 local · NCEI
May 7, 2024 1.00 inquarter 1.66 WSW Sattre — 16:05 local · NCEI
Jun 28, 2022 1.25 inhalf dollar 2.3 NNE Kendallville — 18:16 local · NCEI
Jun 28, 2022 1.00 inquarter 4.09 NE Kendallville — 18:13 local · NCEI
Apr 13, 2018 1.00 inquarter 1.01 E Ossian — 06:02 local · NCEI
May 15, 2017 2.00 inhen egg 0.5 E Calmar — 17:59 local · NCEI
May 15, 2017 1.50 inping pong ball 1.01 E Spillville — 17:51 local · NCEI
May 15, 2017 2.00 inhen egg Ft Atkinson $500K 17:47 local · NCEI
May 15, 2017 1.00 inquarter 0.5 E Ridgeway — 17:07 local · NCEI
Aug 18, 2014 1.25 inhalf dollar 2.61 ENE Decorah Muni Arpt — 17:09 local · NCEI

Cities and towns in Winneshiek County

PlaceReportsLargest
Decorah323.50 in
Calmar262.00 in
Ossian132.75 in
Jackson Junction111.75 in
Ridgeway111.75 in

Smaller places with fewer than 10 reports

These places have too few reports for a page of their own, so their record lives here.

PlaceReportsHail daysLatest
Fort Atkinson86May 15, 2017
Spillville77May 15, 2017
Burr Oak43Sep 19, 2024
Castalia32Oct 4, 2006

Questions about hail in Winneshiek County

How often does it hail in Winneshiek County, Iowa?

161 hail reports have been logged in Winneshiek County since 1965. Over the 20 years 2006–2025 that averages 3.8 reports a year. That ranks #34 of 100 Iowa counties by number of reports.

When is hail season in Winneshiek County?

Most reports come in May, July, June. May alone accounts for 30% of all reports.

What is the largest hail recorded in Winneshiek County?

4.25 in (grapefruit size) on July 24, 2009 near 3.67 SW Castalia. 5% of reports here were 2 inches or larger.

When did it last hail in Winneshiek County?

The most recent report in this data is from August 16, 2025 (1.00 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.

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

5 separate days with hail reports since November 3, 2021, adding up to 6 reports. The most recent was August 16, 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.