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
16:12 EDT For one farmer in southern New South Wales the exceptional conditions has him thinking that Christmas is coming early.