Chicago hail storm history
Cook County·NOAA NCEI Storm Events Database·~75-day publication lag
Chicago and Cook County are located in the heart of the Midwest, where warm, moist air from the Gulf of Mexico collides with cold air masses from Canada during spring and early summer. The densely urbanized landscape and Lake Michigan's moderating influence create complex atmospheric conditions that can support hail development, particularly in the western and southern suburbs where lake-breeze boundaries are less dominant.
Check if your roof was damaged by recent hail
Hail in the Chicago area peaks during April, May, and June, when atmospheric instability is highest and wind shear favors organized storm development. March and July also present secondary risk periods. The Lake Michigan corridor's influence on local wind patterns can enhance storm intensity along westward-moving fronts, making suburban areas away from the lakeshore more prone to hail formation during these months.
Annual frequency — last 10 years
When hail hits — monthly pattern
Avg events per month · all years · NOAA data
No hail events recorded in the NOAA Storm Events Database for Cook County.
This may reflect limited spotter coverage, not absence of hail activity.
NOAA National Centers for Environmental Information Storm Events Database. Publication lag is approximately 75 days — current-year events may be incomplete.
NOAA Storm Events Database ↗