It's March, meaning it's meteorologically spring, but this morning it doesn't feel that way. The overnight low at O'Hare bottomed out at -19.4°C, with a forecast high today around -9°C. We may even hit a record for the coldest March 4th in recorded history. Real spring-like weather won't come until Saturday, at the earliest, when it'll stay above freezing all day while it rains on us.
At least we have a pleasant side-effect to this Arctic high-pressure system squatting over Chicago right now: