If you are writing a paper or need a quick answer, here is the synthesis of the sources above:
Most Australians, weather bureaus, and climate scientists use this definition.
Australia, being in the Southern Hemisphere, experiences a reversed seasonal pattern compared to the Northern Hemisphere. While June, July, and August are considered summer months in the Northern Hemisphere, Australia's summer months are from December to February. what month is summer in australia
For a more academic or scientific explanation regarding the astronomical viewpoint (often used in physics and astronomy), the Geoscience Australia paper is the standard reference.
It challenges the premise of the question. Instead of "What month is summer?", these papers suggest that in Australia, summer is not a fixed three-month block but a complex series of environmental changes (e.g., the flowering of specific plants or the movement of wildlife). If you are writing a paper or need
Aboriginal and Torres Strait Islander peoples have many different seasonal calendars, none of which map directly to a fixed three-month “summer.”
The most "useful paper" for practical purposes is the official standard provided by the Australian Government's Bureau of Meteorology. This is the document referenced by meteorologists, government agencies, and the media. For a more academic or scientific explanation regarding
While the above months are generally considered summer in Australia, the exact timing and duration of summer can vary depending on the region: