Weather forecast or lottery numbers? ... Bathers cool off at St Kilda beach earlier this month. Photo: Sebastian Costanzo
That doona you pulled out from storage at the weekend to put back on the bed? Don't get too used to it being there.
Heatwaves are on the increase, extreme precipitation events are on the increase, and on that there is really no room for doubt any more.
Yes, it's a Melbourne summer, and the weather is as variable as ever.
After a mild few days, with tops of 24 on Saturday and just 21 on Sunday and Monday, the mercury is creeping back to highs for appropriate beach weather - but only briefly.
A top of 29 is expected on Tuesday, and 28 on Wednesday, but Thursday is the warmest day of the week.
In Melbourne, the mercury is tipped to reach 39. Mildura is again expected to be the warmest city in the state, with a top of 43 forecast, with 42 expected in Horsham and Swan Hill, 41 in Echuca and 40 in a number of other centres including Albury, Bendigo and Geelong.
That heat has brought the Country Fire Authority's fire danger ratings for much of the state to very high, and for the north central, south west, Wimmera and central districts, which includes Melbourne, the rating is severe.
Overnight Thursday, the minimum is predicted at 24, but Friday will see a change. With the chance of thunderstorms in the late morning and early afternoon, Friday is tipped to reach 27. Showers are possible on Saturday morning, with a top of 24 expected.
Although recent weather in Melbourne has been somewhat variable, with distinct peaks and troughs, the opposite is true for other cities on the other side of the world, with colder-than-normal winters.
In Britain, persistent sub-zero temperatures have sparked fears that more people could die this winter than the 24,000 who died during last winter, which was comparably milder.
Drivers have been told to cancel non-essential journeys as snow blankets the country.
In Japan, hundreds of flights have been cancelled as snow piles up across the Kanto region, which includes Tokyo.
Hundreds of people have died during an icy blast across Russia in the past month. To Christmas Day, 123 people died of exposure to the bitterly cold conditions and frostbite.
In Moscow, the temperatures have plunged to minus 30 degrees, but the mercury in Siberia was as low as minus 60. Local media described the Russian winter as the coldest in 70 years.
Weather service Gidromettsentr has predicted freezing rain to some regions of southern Moscow this week. Temperatures overnight at the weekend are expected to drop to minus 21 degrees.
Meanwhile, as Australia recovers from last week's record-breaking temperatures, the head of the United Nations' Intergovernmental Panel on Climate Change says it is clear heatwaves are occurring more frequently, and will increase further with global warming.
Dr Rajendra Pachauri, who arrived in Australia on Monday, stopped short of directly linking last week's heatwave across much of the country to climate change. While it could be part of a trend, he said, conclusions could not be drawn from a single event.
''It [last week's record temperatures] could be [a result of climate change], but I wouldn't draw any conclusions on one single event. I think you have to take the whole aggregation over a period of time and then come up with the conclusion; which is precisely what we have done,'' he said.
''They [the findings] are very very clear. Heatwaves are on the increase, extreme precipitation events are on the increase, and on that there is really no room for doubt any more,'' he said.
With Tom Arup and agencies