Illinois Storm Data: Hail, Wind & Severe Weather

Deduplicated severe weather activity for Illinois, fused from NWS warnings, storm reports, official records, and FEMA declarations.

Illinois severe weather data — state map card, hail and wind history for the last 12 months

Illinois severe weather at a glance (last 12 months)

StormAuditor's consolidated public record currently shows 10,054 storm events impacting 102 of Illinois's 102 counties in the trailing 12 months: 3,877 wind events, 3,721 hail events, 991 tornado events, 1,465 flood events. Events are fused from National Weather Service warnings and Special Weather Statements, observed Local Storm Reports, official NCEI storm records, and FEMA disaster declarations, then consolidated into a single event table under the published methodology. Because a single storm can carry more than one hazard tag (a squall line can produce both wind and flood records), the per-type counts can legitimately add up to more than the consolidated total. Sub-severe statements (radar-indicated gusts of 40+ mph or hail of 0.5"+) are included at a distinct moderate tier and never counted as severe.

Biggest Illinois storm days

April 27, 2026 — 897 recorded events (flood, hail, tornado, wind)
April 17, 2026 — 607 recorded events (flood, hail, tornado, wind)
June 17, 2026 — 539 recorded events (flood, hail, tornado, wind)
March 10, 2026 — 468 recorded events (flood, hail, tornado, wind)
June 11, 2026 — 464 recorded events (flood, hail, tornado, wind)

Most impacted counties

Cook — 489 events (282 severe)
DuPage — 298 events (167 severe)
Will — 280 events (206 severe)
Tazewell — 224 events (146 severe)
McLean — 218 events (130 severe)
Champaign — 194 events (119 severe)
Sangamon — 192 events (119 severe)
Vermilion — 178 events (102 severe)

Additional activity recorded in NWS forecast zones: St. Charles (5) · Sullivan (3).

Download the Illinois dataset (free)

The full consolidated Illinois event list for the trailing 12 months — dates, counties, hazard types, severities, measured gusts and hail sizes, with coordinates; source records deduplicated, and each NWS warning product listed per affected county — downloads free and stays current with the live record: download CSV · download JSON. Reusable with attribution under the data license; the JSON file carries a field dictionary and provenance notes.

Research a specific Illinois address

Statewide counts tell you where activity concentrated; they do not tell you what happened at one property. For an individual address, run the Free Report Snapshot (an instant YES/NO against StormAuditor's screening thresholds — wind ≥ 45 mph, hail ≥ 0.75 in., deliberately below the official NWS severe criteria), use the Address Lookup, or purchase a full Weather Report for $2.99 covering every qualifying storm date at the address. Browse day-by-day activity on the Storm Calendar or compare states on the Storm Data hub.

All values are derived from public NOAA and NWS data under StormAuditor's published methodology. They are research estimates, not certified weather records — see Limitations. Data last refreshed September 6, 2026.

See where recent storms tracked on the statewide Illinois hail map and wind map, or check the county impact heatmap.

Neighboring states: Iowa storm data · Indiana storm data · Kentucky storm data · Missouri storm data · Wisconsin storm data

About this page: built by Storm Auditor LLC from public NOAA/NWS records — deduplicated warnings, storm reports, station measurements, and official records on a rolling 12-month window, under the published methodology. See the StormAuditor Editorial Team for how content is produced.