For the next 6 months you'll need to be north of the equator to get long nights !
It's more complicated than those maps too. For a start the night-time cloud cover is quite different to to the day-time maps because the heating effect of the sun and, along the eastern seaboard, sea breezes have a significant contribution too. Then there's fog to consider.
Lastly there's also a weak correlation between nighttime cloud cover and the phase of the moon; cloud is more likely between third quarter and new moon than if is first quarter to full.
The BOM cloud cover maps are a start but not all that helpful.
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