Christmas is celebrated on 25 December, which is in the middle of summer! Sometimes it's strange, because we have some winter traditions from the northern hemisphere, but we celebrate in summer.
Our Christmas holidays and summer holidays are all rolled into one.
Here are some websites with descriptions of Christmas traditions in Australia:
http://www.whychristmas.com/cultures/australia.shtml
http://www.thekoala.com/ausxmas.htm
http://australia.gov.au/about-australia/australian-story/christmas-season-celebrations
