I've been having some fun reading the colonial accounts from David Ludlum's Weather Factor. Seems like there were many ratters even back then!
1620/1621
1629/1630
1644/1645
1646/1647
1752/1753 - 1755/1756 4 consecutive seasons!
Also wanted to point out 1747/1748 looks like an absolute monster year I've never heard about:
If anyone is interested it looks like its available free of charge online : https://books.google.com/books?id=JtC9BwAAQBAJ&printsec=frontcover&source=gbs_atb#v=onepage&q&f=false