Based on station data only, here are the coldest single days during some notable cold snaps in the Lower 48:

Dec 24, 1983: 9.3°F
Feb 11, 1899: 10.5°F
Dec 22, 1989: 11.9°F
Feb 15, 2021: 16.7°F
Jan 21, 1985: 17.1°F
Jan 30, 1949: 17.4°F
Feb 18, 1936: 18.7°F
Dec 24, 1983: 9.3°F 1/
Feb 11, 1899 2/
Dec 22, 1989: 11.9°F 3/
Feb 15, 2021: 16.7°F 4/
Jan 21, 1985: 17.1°F 5/
Jan 30, 1949: 17.4°F 6/
Feb 18, 1936: 18.7°F 7/7
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