In 1977 they had an icebreaker come up the Delaware, lol. The ice was 2 feet thick I believe.
1994 I call the ice winter - icicles hanging in trees for days, and my yard looked liked it had 3" of liquid ice poured over it. Amazing, you could even see the grass underneath in spots.
I remember rolling blackouts due to high power consumption, which surprised me for wintertime.