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Posted: 2024-01-17 18:54:25

Halfway into summer, and the season has thrown up a range of extremes across the country — from heavy rainfall and flooding, to a delayed monsoon in the north and extreme heatwaves in the west.

Much of Victoria and South Australia have already received their entire summer's worth of rainfall.

Other regions — including much of western WA and parts of Australia's tropics — have a lot of making up to do if they are to receive their normal rainfall for the season.

So what could be in store for the rest of the summer?

A dry signal for February

Unfortunately, due to the nature of the atmosphere, it is impossible to accurately predict the specific weather events that will play on beyond the next week or so.

But the Bureau of Meteorology's latest long range outlook gives a clue as to how the odds are stacked.

For the final week of January up to February 3, the models are currently tipping wetter-than-normal conditions to continue through parts of central and eastern Australia, while the run of drier-than-normal conditions is likely to continue for Western Australia's west coast.

But by February, a drier signal is favoured by outlooks for much of northern Australia.

The rainfall outlook for February from the Bureau of Meteorology

February is showing a dry signal across much of Australia, except for in the east.(Supplied: Bureau of Meteorology)

This is most emphatic for northern parts of WA and the NT, which Bureau of Meteorology climatologist Caitlin Minney said was due to the monsoon. 

"While [the outlook] is favouring wetter-than-median conditions for the rest of January … it's unfavourable for rain in the west going into February," she said. 

"This is likely due to the forecast position of the Madden-Julian Oscillation, which is predicted to be in the western hemisphere by February, which is typically unfavourable for monsoon activity over northern Australia."

A large, dark and ominous cloud hangs over the Darwin skyline

The monsoon has finally set in over the north of Australia after a late start.(ABC News: Dane Hirst)

In the eastern states, however, as well as parts of southern WA, the risk of it being wetter or drier than normal is about even.

Bureau of Meteorology climatologist Caitlin Minney said it meant rainfall totals could go either way at this point.

"At the moment, many areas have a range of outcomes for rainfall that could be occurring from very wet to very dry," she said.

This uncertain forecast is common without a strong climate driver controlling the general pattern, since El Niño typically does not impact Australia's rain in summer, and the positive Indian Ocean Dipole event is now coming to its end.

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