From unseasonably high to unseasonably low Chicago has seen it all this week.
Wednesday's spring-like weather brought temperatures into the upper 50s, with some areas hitting near 60 degrees.
The mild temps were nearly 10 degrees above the average for this time of year.
But the weather quickly moved out of Chicago overnight, sending temps spiraling into the low 30s Thursday.
And the cold weather will only get colder.
Friday's highs are expected to reach into the low 20s, with wind chills in the teens.
The temps are cold even by December standards and will feel more like January, according to NBC Chicago's Andy Avalos.
Temps are expected to continue to plunge into weekend.
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The arctic blast will bring highs down to the teens and the cold weather likely will stay in Chicago throughout next week.
And the frigid temps will drop to the low teens at the start of next week.