Welcome to the forum.
I can relate to the wet winters but mine are mild. Traditionally, in the UK, it is the damp rather than the cold that kills the bees in winter. I can't compare to the hot dry summers. August (one of our summer months) has been wetter and cooler than usual. The plants have had sufficient water for nectar but a better temperature would have helped the flow.
Are there many beekeepers in the Melbourne area ? Is winter survival a problem ?