Hail History

Hail history for Avon, South Dakota

NOAA hail reports in and within about 5 km (3 miles) of Avon since 1973, with preliminary reports to November 3, 2026.

Readout · Avon

Last hail
May 30, 2022
0.88 in, nickel size
Hail days, last 5 years
1
since Nov 3, 2021 · 1 report
Largest ever
4.00 in
grapefruit · Aug 8, 2009

29 reports on 24 days since 1973 · #56 of 305 South Dakota places

Hail map · Avon

Avon Dante Tyndall Wagner Springfield Scotland 10 mi
  • Under 1 in
  • 1–1.75 in
  • 1.75–2.5 in
  • 2.5–4 in
  • 4 in +
  • No size
29 most recent reports with a location; Bon Homme County is shaded. Open street map

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What the record says about Avon

The latest hail report in and around Avon is from May 30, 2022, 0.88 in (nickel size). Since November 3, 2021 there has been one hail day; the biggest stones in that time were 0.88 in on May 30, 2022.

Over the 20 years 2006–2025, Avon logged 18 reports on 13 hail days, about 0.9 reports a year. That is about twice the median South Dakota town on this site (0.5 a year) and ranks #56 of 305 South Dakota cities and towns on this site for all-time reports. Avon accounts for 13% of the 232 reports filed in Bon Homme County.

7% of reports with a size were 2 inches (hen egg) or larger, against 7% for the median South Dakota town on this site. The largest hail on record here is 4.00 in (grapefruit) on August 8, 2009 near 0.86 NE Avon.

Reports were down 80% in 2016–2025 (3) compared with 2006–2015 (15). The busiest year was 2007, with 5 reports on 4 days. Hail here peaks in August (38% of reports); 41% fall between April and June.

Reports a year 2006–2025 average

  • Avon 0.9
  • Bon Homme County 6.0
  • Median South Dakota town on this site 0.5

Hail days 2006–2025

  • Avon 13
  • Bon Homme County 60
  • Median South Dakota town on this site 7

Share 2 in or larger of sized reports

  • Avon 7%
  • Bon Homme County 7%
  • Median South Dakota town on this site 7%

Hail over time

0246 1973: 1 reports, largest 0.75 in 1980 1986: 1 reports, largest 2.75 in 1987: 3 reports, largest 1.75 in 1989: 1 reports, largest 1.00 in 1990 1992: 1 reports, largest 1.50 in 1996: 1 reports, largest 1.75 in 1999: 1 reports, largest 0.88 in 2000 2002: 2 reports, largest 1.75 in 2006: 1 reports, largest 1.50 in 2007: 5 reports, largest 1.75 in 2009: 2 reports, largest 4.00 in 2010 2011: 4 reports, largest 1.25 in 2015: 3 reports, largest 1.00 in 2018: 1 reports, largest 1.00 in 2019: 1 reports, largest 1.00 in 2020 2022: 1 reports, largest 0.88 in
Reports per year, 1973–2026. Bar colour shows the largest hail that year. Reporting grew sharply after the mid-1990s, so early decades undercount.
051015 Jan Feb March: 1 reports (3%) Mar April: 2 reports (7%) Apr May: 7 reports (24%) May June: 3 reports (10%) Jun July: 3 reports (10%) Jul August: 11 reports (38%) Aug September: 2 reports (7%) Sep Oct Nov Dec
All 29 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 1 1
2017 0

Hail days since Nov 3, 2021

DateReportsLargestStorm page
May 30, 2022 1 0.88 in —

Largest hail on record

Largest hail reports in Avon
Date Size Location County Time · source
Aug 8, 2009 4.00 ingrapefruit 0.86 NE Avon Bon Homme 13:17 local · NCEI
Apr 26, 1986 2.75 inbaseball — Bon Homme 16:00 local · NCEI
Aug 21, 2007 1.75 ingolf ball Avon Bon Homme 16:59 local · NCEI
May 5, 2002 1.75 ingolf ball 2 SW Avon Bon Homme 16:55 local · NCEI
Aug 6, 1996 1.75 ingolf ball Avon Bon Homme 17:00 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 Avon
Date Size Location County Time · source
May 30, 2022 0.88 innickel 0.69 N Avon Bon Homme 11:52 local · NCEI
Sep 10, 2019 1.00 inquarter 2.13 NNE Avon Bon Homme 19:23 local · NCEI
Apr 30, 2018 1.00 inquarter 4.6 E Dante Charles Mix 19:23 local · NCEI
Jun 6, 2015 1.00 inquarter 2.14 WNW Avon Bon Homme 17:49 local · NCEI
May 25, 2015 0.88 innickel 4.04 E Avon Bon Homme 14:45 local · NCEI
May 25, 2015 1.00 inquarter 3.03 E Avon Bon Homme 14:43 local · NCEI
Aug 28, 2011 1.00 inquarter 3.03 E Avon Bon Homme 07:08 local · NCEI
Aug 28, 2011 0.88 innickel 1.71 NE Avon Bon Homme 07:05 local · NCEI
Aug 28, 2011 0.88 innickel 2.57 SE Avon Bon Homme 05:30 local · NCEI
Aug 28, 2011 1.25 inhalf dollar 1.71 SE Avon Bon Homme 05:25 local · NCEI
Aug 8, 2009 4.00 ingrapefruit 0.86 NE Avon Bon Homme 13:17 local · NCEI
Mar 23, 2009 0.75 inpenny 0.86 NW Avon Bon Homme 15:27 local · NCEI

Hail history near Avon

Questions about hail in Avon

How often does it hail in Avon, South Dakota?

29 hail reports have been logged in and within about 5 km (3 miles) of Avon since 1973. Over the 20 years 2006–2025 that averages 0.9 reports a year. That ranks #56 of 305 South Dakota places by number of reports.

When is hail season in Avon?

Most reports come in August, May, June. August alone accounts for 38% of all reports.

What is the largest hail recorded in Avon?

4.00 in (grapefruit size) on August 8, 2009 near 0.86 NE Avon. 7% of reports here were 2 inches or larger.

When did it last hail in Avon?

The most recent report in this data is from May 30, 2022 (0.88 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.

How many hail storms has Avon 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 May 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.