KevinM Fair point, but as the article says:
"Australians donβt actually celebrate Christmas during the month of July β that still happens on December 25 when we have a summer Christmas. But it is still a popular new-ish tradition where we enjoy a range of events that happen in July each year and have a wintery feel, so that we can feel a bit like our northern relatives."
Elsewhere the whole "Christmas in July" thing is basically just a way for retailers to start the big build up in July. Anyway, it's totally fine to play Christmas songs at any time of year, if people want to (but for me it seems a bit weird).