The National Weather Service in Chicago has issued a wind chill advisory for DuPage County until 10 a.m. Jan. 22.
Wind chill values during the evening and overnight hours Monday were expected to fall to 20 to 25 degrees below zero, and sub-zero wind chills are here to stay until Wednesday. Some snow may arrive later in the week.
Such low wind chill values can cause frostbite to skin within 30 minutes of exposure and can lead to hypothermia. Anyone who must venture outdoors during the night is advised to wear a hat and gloves.
Here's the forecast for the rest of the work week:
Tuesday: Sunny, high of 9, wind chill to 18 below, wind gusts to 15 mph. Tuesday night, cloudy, low around 7, wind chills to 7 below.
Wednesday: Cloudy, high of 22. Wednesday night, cloudy, low around 13.
Thursday: 40 percent chance of snow with a high near 24. Thursday night, chance of snow, cloudy, low around 17.
Friday: Chance of snow, high near 23. Friday night, chance of snow, low around 9.