LOL! I think it was 1988, May 15, we were hit with a huge snow storm. You're not far off the mark!
My wife grew up in N. Illinois and tells us that she and her marching band have marched in the snow on Memorial Day parades.
Needless to say when her relatives now ask her if she would like to move back there, my trophy wife goes into one of her Blonde things, and says, "Sorry! I no speaka English! So sorry!"