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and Australia isn't adapted to winter at all. winters in Australia are generally colder indoors than in europe or canada.

Earth's axial tilt oscillation between a minimum and maximum variance, paired with an elliptical orbit is what contributes to periods of hot and cold. The orbit alone is what is solely responsible for seasonal variation, it is literally our proximity to the sun ffs.

Now understand that Earth's orbit is an eccentric orbit. Yes that means it changes repeatedly over time. Bam, its science, so we go through eras of unseasonally adverse weather that are naturally atypical to what we previously experienced.

It has nothing to do with climate change. Climate change is a scam that is not supported by scientific data.

Another contributing factor to retaining thermal mass is population density.

Building massive, overcrowded, concrete jungles exacerbate temperature.
Go check a heat map and find that all the massive temperature changes are in capital cities irrespective of whether they are in temperate or sub-termperate climes, or coastal or inland regions.

To put it plainly we go through day-night cycles, seasonal cycles, annual cycles, and millennial cycles.

If this nonsense keeps up I'm going to start burning plastic in the bush.