The National Weather Service has issued a wind chill advisory for McHenry County and its surrounding areas that will take effect from 6 p.m. Monday and last until 10 a.m. Tuesday.
Winds tonight will be 10 to 20 MPH, with a wind chill around -20 degrees.
Frostbite to exposed skin can occur in 30 minutes, and individuals are not recommended to spend extended time outdoors, said Richard Castro of the National Weather Service Chicago office.
Temperatures in McHenry County will drop to five degrees below freezing tonight, marking the coldest it has been since February 2011, according to the National Weather Service.
The temperature at 1 p.m. Monday was seven degrees in Crystal Lake, with no signs of warming until Wednesday.
“Temperatures this afternoon aren't going anywhere,” Castro said. “The temperature will slowly fall, with some dangerous temperatures coming tonight.”
The entire week will be below freezing, as temperatures are not expected to get above 32 degrees until Sunday. There is a chance for some snow Thursday, but its too early to tell how much, if any, will fall, said Castro.