Season in Australia When It's Summer in the U.S.

Winter. Australia is in the Southern Hemisphere; its seasons are opposite the Northern Hemisphere's.

• US Summer (June–August) → Australian Winter (June–August)
• US Winter (Dec–Feb) → Australian Summer (Dec–Feb)
• US Spring (Mar–May) → Australian Autumn (Mar–May)
• US Autumn (Sep–Nov) → Australian Spring (Sep–Nov)

So when Americans grill on July 4th, Australians are in coats (Sydney avg July high 17°C / 63°F; Melbourne 14°C / 57°F). Northern Australia (Darwin, Cairns) stays tropical year-round.