Moontanner
Personally it's infuriating to have ASIAir so unpredictably unreliable, especially when I have a scope and mount that now work utterly reliably, like an appliance.
The seeing in spring is usually terrible along the east coast. Its a result of the surface wind being easterly driven by the thermal gradient between land and sea, which is drawn inland but at some point it rises, flips over and above 1000-2000m altitude the prevailing wind is always a westerly. The interface between these airflows is horribly turbulent and hence poor seeing.
I learnt this by spending 10 years flying paragliders along the coast (Stanwell to Mona Vale) and inland at Blackheath, where you can climb above 3000m and you literally feel the air conditions through your fingertips much the same as an eagle does through their wingtip feathers ... and the seat of your pants when its rough...
Autumn usually has the best seeing - mid March through May near the coast, gentle smooth air.
In the Blue Mountains and further west there's another phenomenon - if a big high-pressure system is centered on top of your site it should be calm at ground level and this also settles the entire air column. In these conditions I've had seeing around 0.5 arcsec RMS and the scope guided at 3000mm at 0.15 arcsec RMS. The result of having stars literally sit on exactly the same pixels for the duration was stunning. eg. this image https://bbs.zwoastro.com/d/27200-m83-in-excellent-seeing
Lastly there is another issue to be aware of - the moon raises a tide in the atmosphere and this has an influence on night-time cloud - around 1st quarter - full moon the likelihood of clear nights is higher than around 3rd-quarter-new moon, when its lower. The correlation isn't so strong that many wouldn't notice, but if you are a keen observer you probably have suspected its the case.
