Canberra has shivered through its coldest morning for 2020 so far.
The temperature plummeted at Canberra Airport to minus 3 on Monday morning, while Tuggeranong got even colder, reaching a low of minus 3.2.
The Bureau of Meteorology said the weather conditions made it feel even colder, with the apparent temperature a chilly minus 5.
It's the coldest morning to hit the capital since September 11 in 2019.
Bureau forecaster Helen Reid said the cold temperatures were driven by a high-pressure system moving across the ACT.
A frosty start to the day in the ACT with plenty of icy lawns with Canberra down to -3.0 (coldest since 11 September last year) and Tuggeranong down to -3.2 (coldest since 24 August last year).— Bureau of Meteorology Australian Capital Territory (@BOM_ACT) May 10, 2020
Sunny today ahead of another frosty start tomorrow: https://t.co/C5IWmWSbRypic.twitter.com/lUwNAiVaAq
"The high-pressure system was allowing clear skies and for all the heat to disappear," Ms Reid said.
"We had a cold front move through on the weekend and that allowed for the cold air to come up behind it, and now the ridge of the high-pressure system is the dominant feature."
Monday morning's temperature was five degrees lower than the average minimum for May, which is 2.3 degrees.
It's not, however, the lowest temperature seen in May, with that record being minus 6.9 set in 2011.
"[Monday's temperature] was significantly lower than average," Ms Reid said.
"It's in the lowest 10 per cent of temperatures for May, so it's in the realms of unusual for this time of year."
The high-pressure system that was driving Monday's chilly start will hang around for the next few days.
While Tuesday will have a warmer start, it will still be in negative territory with a low of minus 1.
"This time of year the cold weather creeps in," Ms Reid said.
"Anzac Day is the time to bring the heater out in Canberra, and Monday is a reminder of why you do that."
Cold weather has been seen across most of NSW with the exception of the coastal fringes as temperatures plummeted in western parts of the state to single digits.
The cold snap on Monday didn't bring any snow to the ACT, but parts of the Snowy Mountains did receive falls during the weekend.
Tuesday in Canberra will bring a low of minus 1 but will rise to 14 after some morning fog.
The mercury will stay in positive territory for the rest of the week with a low of 3 expected on Wednesday and Thursday with both days having a high of 14.