The south-east is shivering through a biting cold snap while the north swelters in another episode of Australia's wild weather.
The calendar may say summer is only a week away but it certainly doesn't feel like it in the south east.
"You'd be forgiven for thinking it was the middle of June, but it's actually late November," remarked Bureau of Meteorology forecaster Jonathan How.
Maximum temperatures are 5 to 15 degrees below average across the south east.
The unseasonal chill is thanks to incredibly cold air moving up over the south east.
"It has travelled a long way to be with us, all the way from well south of the country," Mr How said.
But what you are probably really feeling is the wind chill.
"Just, for example, we had some showers pass through Melbourne around lunchtime," Mr How said.
"At Melbourne Airport Tullamarine, the actual temperature fell to about 5 or 6 degrees but the 'feels like' temperature was -7 with that wind chill."
Damaging winds have been whipping through the south east.
"There is a warning for lower south-east, South Australia, much of Victoria, and south-east New South Wales," he said.
"We have already seen widespread wind gusts above 90 kilometres an hour, including some around Melbourne and the Illawarra coast today."
More warnings are likely to come for Tasmania tonight along with snow.
"We have seen some decent snowfalls for some of the alpine resorts but there is a possibility of a dusting about some of the ranges around Melbourne, including the Macedon Ranges," Mr How said.
"Into tonight, with that colder air moving through, the snow level will fall to 500 to 600 metres in Tasmania and 800 to 900m in Victoria and southern New South Wales."
In contrast, Brisbane was expected to get up to 35 degrees Celsius today with extreme fire dangers.
When is the cold going to end?
Thankfully today is looking like the coldest, windiest day for most … unless you are in Tasmania, where Tuesday is the day to hunker down.
But even once the worst of the cold blows through, it is not really expected to heat up until Thursday when warmer air starts mixing in from the north.
"Friday is looking to be the pick of the week for Adelaide, Melbourne, Hobart, Canberra, and Sydney with temperatures close to average, or above average in parts of South Australia," according to Mr How.
What's the latest on the floods?
This latest round of wild weather has fortunately missed most of the regions in major flood at the moment.
The Lachlan River has now peaked around Forbes and Condobolin but that water is still heading downstream to places like Euabalong and down even further to Hillston.
Meanwhile, the Murray itself is still heaving.
"We are also seeing river rises in places like the Mallee, like Mildura," according to Mr How.
"Once it moves through Mildura, a lot of that water will actually flow into South Australia.
"We are already seeing minor to locally moderate flooding for parts of South Australia."
Which is going to get worse as more and more of the water makes its way downstream.
"Just reminding people to keep in touch with the SES and local road conditions as the river starts to rise over the next few weeks," Mr How said.
Hot in the tropics
The build-up is in full swing up north but with a bit of luck it will be coming to an end soon.
There were some big storms overnight up north.
In Mud Springs in the Kimberley, 130 millimetres hit the gauge, and 97mm was recorded at Mount Krauss nearby.
The storms stretched across parts of the Northern Territory and into northern Queensland, with central Queensland getting large to giant hail on Sunday.
"We are looking at the Madden-Julian oscillation moving into the Australian/Indonesian region over this coming forecast period," Mr How said.
"So that does mean an increase in rainfall and storms and that's exactly what we're seeing across the north of the country."
But until the rains properly set in, heatwave conditions are continuing.
"These have been going on for quite some time," according to Mr How.
"So I'm sure many locals are hanging out for the proper start of the monsoon.
"Heading into the weekend we are looking at much more widespread showers and storms, so heatwave conditions are hopefully done with for this dry season."
The monsoon proper usually kicks in around mid-December but, with the La Niña in full swing, the odds are on for an early onset.
