HRRR has mid -10's for lows at ORD tonight and tomorrow night.
Not records, but could rival the extreme cold of January 2014. Lowest during that period was -16 at ORD.
Turned from FZRA to snow here about 2 1/2 hours ago. It's mostly been light, but did have a period of borderline heavy snow.
Final ice accumulation will go down as 0.15", with 0.7" of snow thus far.