What is the season in December in Australia?
Unlike the US, when it's December, in Australia, it's Summer.
Basically in December
US is Winter
Australia is Summer
Christmas day, December 25th in Australia is at the start of their summer season. The Summer season in the southern hemisphere begins on December 21st or 22nd each year. This of course is the exact opposite of the northern hemisphere, where the Winter season begins on December 21st or 22nd each year.