Main feature of Australian climate is in beginning of summer in December and start of winter in June.

Summer day’s temperature there rarely rises above +30 °C (86 °F). But the main distinctive feature of Australian summer is dry weather. Complete absence of rain and dry period sometimes lasts for a very long time.

The other seasons are defined by grouping the calendar months in the following way:

Spring - September, October and November.

Autumn - March, April and May.

These definitions reflect the lag in heating and cooling as the sun appears to move southward and northward across the equator.

More Info: seasonsyear.com