Low Covid-19 risk in McHenry, Illinois.
Low Flu risk in McHenry, Illinois.
Low Rsv risk in McHenry, Illinois.
Low Infectious risk in McHenry, Illinois.
Very high Allergy risk in McHenry, Illinois.
Low Pollution risk in McHenry, Illinois.
Low Weather risk in McHenry, Illinois.
Last updated: April 20, 2026
Data refreshed weekly