Australia’s ABC News reported:
Thermometers at Badgerys Creek in Sydney’s west dropped 13 degrees Celsius (23F) in just three hours shortly after lunchtime.
By 4pm it was 10C at Observatory Hill, in the CBD, after a high of 22C before the arrival of the polar blast.
The system, which has sucked up cold air from the Southern Ocean, could also bring strong winds, hazardous surf, and hail.
Christie Johnson from the Bureau of Meteorology (BOM) said it was “on the strong end of winter fronts”.