Alton Hail — Storm History & NOAA Data for Alton, IL

Data current as of 2026-10-16 · Sourced from NOAA Storm Events

Over the past five years, the National Oceanic and Atmospheric Administration has recorded 273 hail storms within 25 miles of Alton, IL. Of those, 257 produced hail at least quarter-size — the threshold most insurance carriers consider potentially damaging to asphalt shingles. The largest reported hail in this window was baseball-sized or larger, which can fracture shingle mat and dent metal flashing on contact. 2026 was the most active year on record locally, with 153 documented hail events.

Hail Severity Breakdown — Alton Area (Last 5 Years)

Alton Hail Storms by Year

2026 was the busiest hail year on record locally for Alton, with 153 documented events inside the 25-mile radius. Storm activity in Alton typically peaks in spring and early summer, when the jet stream pushes Gulf moisture into the area and supercell thunderstorms become more frequent.

Notable Recent Alton Hail Storms

• May 4, 2026 — Significant hail (quarter-sized or larger) reported near Bethalto. This storm met the quarter-size insurance damage threshold and is a candidate date when filing a claim for Alton-area properties.
• May 4, 2026 — Severe hail (ping pong ball-sized) reported near 1 NE Alton. This storm met the quarter-size insurance damage threshold and is a candidate date when filing a claim for Alton-area properties.
• May 4, 2026 — Severe hail (ping pong ball-sized) reported near 1 NNE Bethalto. This storm met the quarter-size insurance damage threshold and is a candidate date when filing a claim for Alton-area properties.
• May 4, 2026 — Significant hail (quarter-sized or larger) reported near Alton. This storm met the quarter-size insurance damage threshold and is a candidate date when filing a claim for Alton-area properties.
• May 4, 2026 — Severe hail (ping pong ball-sized) reported near 1 S Godfrey. This storm met the quarter-size insurance damage threshold and is a candidate date when filing a claim for Alton-area properties.

Recent Hail Events Near Alton

Wind Storm History — Alton Area (Last 5 Years)

NOAA has recorded 134 high-wind events within 25 miles of Alton, IL in the past five years. Of those, 134 reached severe-thunderstorm thresholds (58+ mph). The highest measured gust was 100 mph.

Recent Wind Events Near Alton

Frequently Asked Questions About Alton Hail

When was the last major hail storm in Alton, IL?

The most recent quarter-size-or-larger hail storm recorded by NOAA within 25 miles of Alton was on May 4, 2026. HailCheck refreshes from the NOAA Storm Events database daily, so newer events appear here as they are reported.

How often does it hail in Alton?

Alton averages roughly 55 reported hail events per year within a 25-mile radius. Significant storms (quarter-size or larger) account for 257 of the 273 events recorded over the last five years.

How big does hail typically get in Alton?

The largest documented hail near Alton in the last five years was baseball-sized or larger. Most Alton-area hail falls in the marble-to-quarter range, with destructive storms (egg-size or larger) appearing roughly once every few years.

Does my insurance cover hail damage in IL?

Most homeowners insurance policies in IL cover hail damage to roofs, siding, and gutters under the dwelling and other-structures coverage. Coverage typically requires the damage to be tied to a verifiable storm date — which is where the NOAA hail history above (and a HAAG-style test square validation) becomes important for the claim file.

How do I check hail history for a specific Alton address?

Use the HailCheck address search to enter any street address in or near Alton. HailCheck returns every NOAA hail event within a configurable radius, along with severity bands, dates, and storm narratives for Pro members.

What a HAAG-Style Test Square Validation Means in Alton

If your property in or near Alton took on hail during one of the storms above, the standard process for documenting damage is a 10×10 foot test square inspection. A HAAG-trained reviewer counts impact indicators — granule displacement, mat fractures, and bruising — within the marked square and produces a PASS or FAIL document for the claim file.

HailCheck offers a $99 photo-based HAAG-style test square validation. You submit photos from the field, our reviewer evaluates the impact indicators and cross-references the NOAA storm dates listed above, and a written PASS/FAIL determination is returned within one business day. We do not send anyone to the roof — the validation is built around the photos you submit.

Why Alton's Location Matters for Hail

Alton sits east of the traditional hail alley, where hail events are less frequent than the central plains but tend to be associated with strong squall lines and tropical systems. Local roof systems are less commonly hardened for hail, which can mean even moderate impacts produce claim-worthy damage.

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