What temperature scale does Australia use?
Australia, like most European countries, uses the Celsius scale for temperature. They also use the metric system for weights and measurements. The US uses Fahrenheit for temperature and the English system for weights and measurements.
The US would do well to use the metric system as science uses it. It would be nice for all to use one universal system.
Gives the answer along with the year that it started on this website: http://www.answers.com/Q/Does_Australia_use_the_celsius_temperature_scale