I'm lucky enough to have a good friend who works at the Bureau of Meteorology and he pointed me at this useful map.
It shows the trend in rainfall patterns for Australia from 1970 to the present.
The key thing I've noticed is that the areas that I've been thinking about (South East Australia, mainly Victoria) shows a significant drop in annual rainfall.
Digging a little deeper shows that this drop in rain is mostly in Autumn and Summer. I'm not sure what implications this has for the growing of oak trees. I suspect it will mean that irrigation is more important than I'd initially thought.
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