Snow has fallen overnight in the ACT, driven by a large cold front moving across the territory.
Falls were seen in ranges to the west and south of Canberra on Monday morning.
The Bureau of Meteorology said there was the potential for snow sightings on Monday morning around parts of Tuggeranong and Gungahlin, as well as along the northern border of the ACT.
Meteorologist from the bureau, Dylan Bird, said as much as 4 centimetres of snow fell at Mount Ginini.
"Snow is far more likely further south, but snow in other parts of the ACT is definitely possible today, and over places with elevated terrain above 800 metres," Mr Bird said.
"On Monday night, we're also likely to see snow along the NSW and Victoria border, getting down to around 600 metres."
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The bureau says the snow was driven by a large cold front moving across the south-east of Australia formed in the Southern Ocean, bringing with it windy conditions.
"There's been a very cold air mass over the south of NSW and there's also a fairly thick and low cloud band over that area, which with the combination of the cold air mass, is a good trigger for snowfall," Mr Bird said.
"There's a strong wind-chill factor associated with strong westerly and south-westerly winds, which is really bringing the feels-like temperature right down."
Large snowfalls have also been seen in the Snowy Mountains, with Perisher recording 20 centimetres of snow during an overnight blizzard.
"Heavy snowfall kicked off around 8pm last night and is set to continue throughout the day today," a Perisher spokeswoman said.
A further 35 centimetres is forecast to fall at Perisher heading into Thursday.
The cold front is expected to move across the ACT and most of NSW on Monday, before heading out to sea.
The front has brought temperatures plummeting across Canberra. A high of just 9 degrees is forecast for Monday.
The mercury dropped to as low as 2 degrees during the morning, but the strong winds made it feel as cold as minus 4.
"We should also see overnight frost around Tuggeranong," Mr Bird said.
"With the clearer skies as the cold front passes, we could see more frost overnight, with minus temperatures and it should be fairly cold on Tuesday."
Snow has been forecast to fall above 1200 metres on Tuesday, with showers predicted in the afternoon and evening.
The temperature is expected to drop to minus 1 on Tuesday before getting up to 11.