Parts of the state have received a heavy dumping of snow overnight.
It is understood up to foot of snow has fallen at Gunning in Southern Highlands.
There have also been snow showers this morning around Goulburn, Crookwell, Orange and Lithgow.
The Bureau of Meteorology says a very cold air mass that has moved across New South Wales has caused a deep low to form on the South Coast which has produced the snow.
Forecaster Ewen Mitchell says it is not unheard of at this time of year.
"I don't think there's been hugely heavy falls, but they've been fairly wide spread," he said.
"It's certainly not record breaking in terms that it's happened before at this time of year but, it's certainly a fairly cold burst.
"But, yeah we do see this from time to time in October."
The Bureau of Meteorology says it is expected to ease into showers at around midday.
© ABC 2012
00:30 EDT Locals on the Cocos Islands have spent Christmas Day hunkered down in their homes, as Tropical Cyclone Kate passed just north of the tiny community more than 2,000 kilometres off the West Australian coast.