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I personally don't think that anything over such a short term scale can be used to deduce anything.
My quite limited understanding is that the vast majority of short term weather patterns (years to a couple of decades) is determined by the El Niņo and La Niņa which can have a dramatic effect on the weather over all Australia.
Medium term (many decades +) are caused by massive geophysical events (the dark ages) or things such as climate change and CO2 emissions.
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