Historical hail archive: January 2016–December 2025. NOAA radar estimates within 25 miles of each city centre. ZIP matches use the first three digits; this is not a property-level report or a live alert service. Coverage and source.
1 tracked areas · 2016–2025
Hail damage in Illinois
Across the Illinois areas we track, radar has recorded 204 hail days, 55 of them at golf-ball size or larger. Biggest stone: 4.00 in (10.2 cm) on July 21, 2017 near Chicago.
Data last refreshed: · source: NOAA NCEI Severe Weather Data Inventory
Illinois areas by exposure
| City | County | RoofTake Score | Hail days | ≥1.75 in | Biggest |
|---|---|---|---|---|---|
| Chicago | Cook County | 67 | 204 | 55 | 10.2 cm |
How the RoofTake Score is calculated — the formula and its weights are published in full.
When it hails in Illinois
Own a roof in Illinois?
- Check your ZIP code and see how many hits your area has taken.
- Work out what your roof has been through since you bought the house — and print it for the adjuster.
- Run the eight-question roof condition check.
- Before you touch the insurance, work out whether filing pays you anything at all.
Common questions
Which city in Illinois gets the most hail?
Of the areas we track, Chicago has the highest RoofTake Score (67 out of 100). The ranking is by exposure, not by damage — damage depends on what was standing under the storm.
When is hail season in Illinois?
The busiest month in our record is July. The season is short and the risk is not spread evenly — most of the annual exposure arrives in a few weeks.
Do you cover the whole of Illinois?
No. We publish 1 area in Illinois, because a page with real numbers is worth something and a thousand pages with the same sentence are not. Yours missing? Tell us and we will queue it.
Roofers who work in Illinois
We pass your details to licensed contractors in our partner network who cover your county.