Anyone noticing some similar yrs, months, and dates to this collection of experiences. January 19-21 1985, January 1994, and I would bet Christmas Eve and day 1983 will be in these experiences as well. These three times it was the coldest it has gotten in the lower 48 and Canada in the last 3 decades. Going back just a bit further in climatological history there were certainly some very cold times in the late 1970s. And in Alaska in 1972 the coldest temperature ever recorded in the US was observed at -72°F I believe. And going way back another major arctic outbreak was in January 1940.
Having said that the coldest temp I have had to start a car was in January 1994 at -4°F. There have been other times recently about that cold in my area. January 2014 and February 2015, and this past January 2017 it was right at 0°F or just below -2 to -4°F in my area.
Coldest my father ever had to start a car in was January 21, 1985 when it got down to -12°F during that massive cold outbreak. It got down to -34°F at Mountain Lake in southwest Virginia that same morning. The all time coldest low temperature observed on record for the state.