Hail History

Hail history for O'Fallon, Missouri

NOAA hail reports in and within about 5 km (3 miles) of O'Fallon since 1967, with preliminary reports to November 3, 2026.

Readout · O'Fallon

Last hail
Apr 27, 2026
1.25 in, half dollar size
Hail days, last 5 years
4
since Nov 3, 2021 · 13 reports
Largest ever
2.75 in
baseball · Apr 28, 2012

70 reports on 49 days since 1967 · #24 of 491 Missouri places

Hail map · O'Fallon

O'Fallon St. Peters Weldon Spring Wentzville New Melle St. Charles Chesterfield Wildwood Maryland Heights 10 mi
  • Under 1 in
  • 1–1.75 in
  • 1.75–2.5 in
  • 2.5–4 in
  • 4 in +
  • No size
70 most recent reports with a location; St. Charles County is shaded. Open street map

For homeowners

Roof damage after hail? Get a free inspection

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 O'Fallon is from April 27, 2026. A local roofer can check and document it at no cost.

Phone line opening soon

What would a claim cost you? Try the hail claim calculator

Preview: this form is not connected yet. Nothing you enter is sent or stored.

Roofer? Get hail alerts for your area with StormScope

What the record says about O'Fallon

The latest hail report in and around O'Fallon is from April 27, 2026, 1.25 in (half dollar size). Since November 3, 2021 there have been 4 separate hail days; the biggest stones in that time were 1.75 in on May 16, 2025.

Over the 20 years 2006–2025, O'Fallon logged 42 reports on 29 hail days, about 2.1 reports a year. That is 4.2 times the median Missouri town on this site (0.5 a year) and ranks #24 of 491 Missouri cities and towns on this site for all-time reports. O'Fallon accounts for 20% of the 346 reports filed in St. Charles County.

6% of reports with a size were 2 inches (hen egg) or larger, against 5% for the median Missouri town on this site. The largest hail on record here is 2.75 in (baseball) on April 28, 2012 near 1.44 NNE Lake St Louis.

Reports were down 60% in 2016–2025 (12) compared with 2006–2015 (30). The busiest year was 2025, with 8 reports on 3 days. Hail here peaks in April (44% of reports); 81% fall between April and June.

Reports a year 2006–2025 average

  • O'Fallon 2.1
  • St. Charles County 10.2
  • Median Missouri town on this site 0.5

Hail days 2006–2025

  • O'Fallon 29
  • St. Charles County 87
  • Median Missouri town on this site 9

Share 2 in or larger of sized reports

  • O'Fallon 6%
  • St. Charles County 8%
  • Median Missouri town on this site 5%

Hail over time

02468 1967: 1 reports, largest 0.75 in 1970: 1 reports, largest 0.75 in 1970 1974: 2 reports, largest 2.75 in 1978: 1 reports, largest 1.00 in 1980 1983: 1 reports, largest 0.75 in 1984: 1 reports, largest 0.75 in 1985: 1 reports, largest 1.50 in 1990: 1 reports, largest 1.00 in 1990 1991: 1 reports, largest 1.75 in 1996: 2 reports, largest 1.75 in 1997: 1 reports, largest 0.75 in 2000: 4 reports, largest 1.00 in 2000 2001: 1 reports, largest 1.00 in 2003: 1 reports, largest 0.75 in 2004: 1 reports, largest 0.75 in 2005: 3 reports, largest 0.75 in 2006: 4 reports, largest 0.88 in 2007: 1 reports, largest 0.75 in 2008: 3 reports, largest 0.88 in 2010: 3 reports, largest 1.00 in 2010 2011: 8 reports, largest 2.00 in 2012: 6 reports, largest 2.75 in 2013: 1 reports, largest 0.75 in 2014: 3 reports, largest 0.88 in 2015: 1 reports, largest 1.00 in 2016: 1 reports, largest 1.00 in 2019: 2 reports, largest 1.25 in 2020: 1 reports, largest 1.00 in 2020 2025: 8 reports, largest 1.75 in 2026: 5 reports, largest 1.25 in
Reports per year, 1967–2026. Bar colour shows the largest hail that year. Reporting grew sharply after the mid-1990s, so early decades undercount.
010203040 January: 2 reports (3%) Jan February: 1 reports (1%) Feb March: 2 reports (3%) Mar April: 31 reports (44%) Apr May: 14 reports (20%) May June: 12 reports (17%) Jun July: 4 reports (6%) Jul August: 1 reports (1%) Aug September: 2 reports (3%) Sep October: 1 reports (1%) Oct Nov Dec
All 70 reports by calendar month.
Reports per month, 2017–2026. Darker cells had more reports.
YearJanFebMarAprMayJunJulAugSepOctNovDecTotal
2026 5 5
2025 35 8
2024 0
2023 0
2022 0
2021 0
2020 1 1
2019 11 2
2018 0
2017 0

Hail days since Nov 3, 2021

DateReportsLargestStorm page
Apr 27, 2026 5 1.25 in —
May 16, 2025 5 1.75 in —
Apr 30, 2025 2 1.00 in —
Apr 10, 2025 1 1.00 in —

Largest hail on record

Largest hail reports in O'Fallon
Date Size Location County Time · source
Apr 28, 2012 2.75 inbaseball 1.44 NNE Lake St Louis St. Charles 16:43 local · NCEI
May 30, 1974 2.75 inbaseball — St. Charles 17:45 local · NCEI
Apr 22, 2011 2.00 inhen egg 2.22 WSW All Saints Vlg St. Charles 18:42 local · NCEI
Apr 19, 2011 2.00 inhen egg 0.97 ENE Dardenne St. Charles 15:39 local · NCEI
May 16, 2025 1.75 ingolf ball 1.76 WSW Weldon Spg St. Charles 13:15 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 O'Fallon
Date Size Location County Time · source
Apr 27, 2026 1.25 inhalf dollar 0.69 N O Fallon St. Charles 17:39 local · NCEI
Apr 27, 2026 1.25 inhalf dollar 0.88 NE Ft Zumwalt St. Charles 17:36 local · NCEI
Apr 27, 2026 1.25 inhalf dollar O Fallon St. Charles 17:35 local · NCEI
Apr 27, 2026 1.00 inquarter 0.88 SW Lake St Louis St. Charles 17:35 local · NCEI
Apr 27, 2026 1.00 inquarter 0.88 SE Ft Zumwalt St. Charles 17:30 local · NCEI
May 16, 2025 1.25 inhalf dollar 0.69 N Weldon Spg St. Charles 13:23 local · NCEI
May 16, 2025 1.00 inquarter 1.62 E Dardenne St. Charles 13:18 local · NCEI
May 16, 2025 1.75 ingolf ball 1.76 WSW Weldon Spg St. Charles 13:15 local · NCEI
May 16, 2025 1.25 inhalf dollar 2.14 SSW O Fallon St. Charles 13:12 local · NCEI
May 16, 2025 1.00 inquarter 0.69 S O Fallon St. Charles 13:07 local · NCEI
Apr 30, 2025 1.00 inquarter 1.28 ENE Dardenne St. Charles 16:46 local · NCEI
Apr 30, 2025 1.00 inquarter 1.28 WSW Weldon Spg St. Charles 16:41 local · NCEI

Hail history near O'Fallon

Questions about hail in O'Fallon

How often does it hail in O'Fallon, Missouri?

70 hail reports have been logged in and within about 5 km (3 miles) of O'Fallon since 1967. Over the 20 years 2006–2025 that averages 2.1 reports a year. That ranks #24 of 491 Missouri places by number of reports.

When is hail season in O'Fallon?

Most reports come in April, May, June. April alone accounts for 44% of all reports.

What is the largest hail recorded in O'Fallon?

2.75 in (baseball size) on April 28, 2012 near 1.44 NNE Lake St Louis. 6% of reports here were 2 inches or larger.

When did it last hail in O'Fallon?

The most recent report in this data is from April 27, 2026 (1.25 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.

How many hail storms has O'Fallon had in the last five years?

4 separate days with hail reports since November 3, 2021, adding up to 13 reports. The most recent was April 27, 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.