I would ignore both Skippysky and 7timer's seeing predictions.
Skippysky's seeing predictions seem to be tied to the jetstream and ignore all other factors. Almost always it displays Pickering 8 or more for Melbourne (with 1 being terrible and 10 being perfect on this scale).... which is obviously bulldust. I've gone out on many a night when skippysky predicted excellent seeing, only to be met with mush and mud.
However, I will say Skippysky is very useful for predicting cloud 24-48 hours out.
7timer on the other hand always tends to predict the worst possible seeing at the same times during every 24 hour cycle and always throws up a pattern of the worst seeing on the scale during the night, and better during the day regardless of time of year or jetstream conditions... atleast for Melbourne anyway. Again, this is far from accurate.
Gauging the severity of star twinkling by the naked eye is one age old method, and while twinkling stars suggest poor seeing, it is not fail-safe. One evening I saw some of the worst twinkling and baulked at the idea of getting the scope out, but a few hours later I was enjoying one of the top 5 sessions of my life.
The only sure-fire way of figuring out the seeing is getting out there with the scope...
