All relative I suppose. Here the worst seeing is when Saturn is being ripped apart, bad seeing is when it's a shimmering blob & you can vaguely make the ring out, fair seeing is when you can see the ring & disk clearly, good seeing is when you get glimpses of the Cassini Division in moments of steadiness, and excellent seeing is... well, I've no idea actually!
That's what you get when you live at the bottom of a deep east-west valley on the western side of the Great Dividing Range. Thermal-city with easterly wind drift, cold air cascading & funneling down from the Alps, and differential heating of the valley sides. That's before you even get to jetstream etc!
Cheers -