Snow has fallen on parts of parts NSW, Victoria and Tasmania only weeks out from summer, as Sydney shivered through its chilliest November night in 20 years.

An unseasonable cold front surged over southeast Australia during the weekend.

Daytime temperatures plummeted and brought more alpine snow than fell over  winter, according to Weatherzone.

About 10 centimetres of snow fell on the Victorian Alps. The mercury dived to minus 5.9 degrees at Mt Hotham and minus 5.6 at Falls Creek.

In Sydney, temperatures dropped to 9.7°C on Saturday — the coldest November night in 20 years.

“You will not believe this, it’s springtime in Australia, in November, and it’s snowing,” said Thredbo resort retail manager Madeleine McVie in an Instagram post on Saturday.

“Like, not just a little bit. It’s fully snowing.”

Temperatures fell to single digits across much of southeast Australia’s mainland and Tasmania.

Weatherzone said a number of towns recorded their coldest November night in nearly a decade including:

•  Ouse (-0.9°C), coldest since November, 2008.
• Goulburn Ap (-1.0°C), coldest since November, 2014
• Casterton (0.5°C), coldest since November, 2017
• Coonawarra (0.4°C), coldest since November, 2017

Ten centimetres of snow at Perisher in the Snowy Mountains, NSW. Photo: Facebook

The weather bureau said that while there was often spring snowfall, it was “not always to this extent”.

The temperatures were also “unusually cold” in areas outside the snow belts.

“Some towns and cities are around 8 degrees cooler than average, with brisk winds and passing showers making the feels-like temperature even lower.”