Hail History

Hail history for Oacoma, South Dakota

NOAA hail reports in and within about 5 km (3 miles) of Oacoma since 1980, with preliminary reports to November 3, 2026.

Readout · Oacoma

Last hail
Jul 4, 2026
0.88 in, nickel size
Hail days, last 5 years
1
since Nov 3, 2021 · 2 reports
Largest ever
1.75 in
golf ball · Jun 20, 2020

10 reports on 8 days since 1980 · #299 of 305 South Dakota places

Hail map · Oacoma

Oacoma Chamberlain Pukwana Reliance Fort Thompson Lower Brule Bijou Hills Kennebec 20 mi
  • Under 1 in
  • 1–1.75 in
  • 1.75–2.5 in
  • 2.5–4 in
  • 4 in +
  • No size
10 most recent reports with a location; Lyman County is shaded. Open street map

For homeowners

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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 Oacoma is from July 4, 2026. A local roofer can check and document it at no cost.

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What the record says about Oacoma

The latest hail report in and around Oacoma is from July 4, 2026, 0.88 in (nickel size). Since November 3, 2021 there has been one hail day; the biggest stones in that time were 1.00 in on July 4, 2026.

Over the 20 years 2006–2025, Oacoma logged 5 reports on 4 hail days, about 0.3 reports a year. That is 44% less than the median South Dakota town on this site (0.5 a year) and ranks #299 of 305 South Dakota cities and towns on this site for all-time reports. Oacoma accounts for 4% of the 240 reports filed in Lyman County.

0% 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 1.75 in (golf ball) on June 20, 2020 near 1 E Oacoma.

The busiest year was 2010, with 3 reports on 2 days. Hail here peaks in July (40% of reports); 30% fall between April and June.

Reports a year 2006–2025 average

  • Oacoma 0.3
  • Lyman County 6.9
  • Median South Dakota town on this site 0.5

Hail days 2006–2025

  • Oacoma 4
  • Lyman County 70
  • Median South Dakota town on this site 7

Share 2 in or larger of sized reports

  • Oacoma 0%
  • Lyman County 9%
  • Median South Dakota town on this site 7%

Hail over time

0123 1980: 1 reports, largest 0.75 in 1980 1990 1996: 1 reports, largest 1.75 in 2000: 1 reports, largest 0.88 in 2000 2010: 3 reports, largest 1.50 in 2010 2018: 1 reports, largest 1.75 in 2020: 1 reports, largest 1.75 in 2020 2026: 2 reports, largest 1.00 in
Reports per year, 1980–2026. Bar colour shows the largest hail that year. Reporting grew sharply after the mid-1990s, so early decades undercount.
01234 Jan February: 1 reports (10%) Feb Mar Apr May: 1 reports (10%) May June: 2 reports (20%) Jun July: 4 reports (40%) Jul August: 1 reports (10%) Aug September: 1 reports (10%) Sep Oct Nov Dec
All 10 reports by calendar month.
Reports per month, 2017–2026. Darker cells had more reports.
YearJanFebMarAprMayJunJulAugSepOctNovDecTotal
2026 2 2
2025 0
2024 0
2023 0
2022 0
2021 0
2020 1 1
2019 0
2018 1 1
2017 0

Hail days since Nov 3, 2021

DateReportsLargestStorm page
Jul 4, 2026 2 1.00 in —

Largest hail on record

Largest hail reports in Oacoma
Date Size Location County Time · source
Jun 20, 2020 1.75 ingolf ball 1 E Oacoma Lyman 16:59 local · NCEI
Jun 27, 2018 1.75 ingolf ball 1 E Oacoma Lyman 07:23 local · NCEI
May 18, 1996 1.75 ingolf ball 2 SW Oacoma Lyman 19:26 local · NCEI
Sep 14, 2010 1.50 inping pong ball 1 E Oacoma Lyman 22:13 local · NCEI
Jul 6, 2010 1.25 inhalf dollar 0.69 S Oacoma Lyman 14:40 local · NCEI

Size of every report

Most recent reports

Most recent hail reports in Oacoma
Date Size Location County Time · source
Jul 4, 2026 0.88 innickel 0.5 W Oacoma Lyman 17:58 local · NCEI
Jul 4, 2026 1.00 inquarter 0.5 E Oacoma Lyman 17:55 local · NCEI
Jun 20, 2020 1.75 ingolf ball 1 E Oacoma Lyman 16:59 local · NCEI
Jun 27, 2018 1.75 ingolf ball 1 E Oacoma Lyman 07:23 local · NCEI
Sep 14, 2010 1.50 inping pong ball 1 E Oacoma Lyman 22:13 local · NCEI
Jul 6, 2010 1.25 inhalf dollar 0.69 S Oacoma Lyman 14:40 local · NCEI
Jul 6, 2010 1.00 inquarter 0.69 S Oacoma Lyman 14:35 local · NCEI
Feb 25, 2000 0.88 innickel Oacoma Lyman 17:00 local · NCEI
May 18, 1996 1.75 ingolf ball 2 SW Oacoma Lyman 19:26 local · NCEI
Aug 6, 1980 0.75 inpenny — Brule 18:40 local · NCEI

Hail history near Oacoma

Questions about hail in Oacoma

How often does it hail in Oacoma, South Dakota?

10 hail reports have been logged in and within about 5 km (3 miles) of Oacoma since 1980. Over the 20 years 2006–2025 that averages 0.3 reports a year. That ranks #299 of 305 South Dakota places by number of reports.

When is hail season in Oacoma?

Most reports come in July, June, February. July alone accounts for 40% of all reports.

What is the largest hail recorded in Oacoma?

1.75 in (golf ball size) on June 20, 2020 near 1 E Oacoma. 0% of reports here were 2 inches or larger.

When did it last hail in Oacoma?

The most recent report in this data is from July 4, 2026 (0.88 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.

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

1 separate days with hail reports since November 3, 2021, adding up to 2 reports. The most recent was July 4, 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.