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
13:56 EDT Like a large area of southeastern Australia, Victoria has been been experiencing a chilly run, as much as four-to-ten degrees below average but is now thawing out.