Snow and ice shut down major NSW roads: 'INCREDIBLE'

An icy cold front overnight shut down major roads in NSW on Wednesday morning.

Residents in the Blue Mountains and Lithgow are urged not to travel this morning due to dangerous conditions with black ice on the roads.

"The Great Western Highway is closed between Katoomba and Mount Victoria while Bells Line of Road is also closed between Bell and Lithgow," Live Traffic NSW posted online shortly after 6am.

"Due to the weather conditions there is no forecast of when these roads will reopen."

NSW Police said the roads would be reassessed at 7.30am but warned of continued delays.

"Significant delays are expected at Victoria Pass due to a heavy vehicle requiring a tow," authorities said.

It comes after the Blue Mountains area was blanketed with snow overnight.

"Emergency services are currently attending numerous incident in the upper Blue Mountains caused by snow and black ice overnight," Blue Mountains Police Rescue said shortly after 8.30am.

"Great Western Highway is closed at present at Katoomba. Please assist us by avoiding the Katoomba to Mt Victoria areas."

In Katoomba, west of Sydney, the mercury dropped to -1.5C, but it felt like -7C, as snow blanketed the ground.

"Temperatures this morning below 0°C in many locations in the wake of a cold front," the NSW Bureau of Meteorology tweeted Wednesday morning.

"There was a dusting of snow along the ranges but today should be sunny for most regions. Daytime temperatures well below average with dry air to help the chill."

Winter wonderland lights up social media

Residents in the Blue Mountains have woken to an icy wonderland with many taking to social media to post images of the "incredible" scenes just a week before Spring is officially set to begin.

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