Overnight temperatures in central Australia have dipped to zero.
The weather bureau's Ben Sutor says it is the coldest night so far this year.
He says the bureau was predicting four degrees and has been taken by surprise.
"There's a good few mornings like this to come," he said.
"Certainly through the weekend we're going to be close to that freezing mark and then a little bit more cloud coming in at the beginning of next week so that will lift the temperatures back up again."
© ABC 2013
11:32 EST Adelaide has enjoyed a dry and relatively warm finish to winter with the mercury set to reach 22 degrees for the fifth straight day.