It was meant to be a reprieve from the extra cold starts to the day, but Canberra's temperature plunged again in the early hours of Monday morning.

It hit minus 7.1 degrees at 1.43am, and was still at minus 5.8 at 6.30am. The temperature fell to minus 8.2 on Sunday, after plunging to minus 8.7 on Saturday - both times colder in Canberra than Thredbo.

Colder than Thredbo: An icy start to a Yarralumla morning. Credit:Richard Lennon

But Monday's top forecast temperature of 10 degrees is a bit lower than the 13 Canberrans enjoyed on Sunday afternoon. The rest of Monday is also expected to bring some rain. The Bureau of Meteorology says there is an 80 per cent chance of up to 5mm, most likely late in the morning.

Goulburn managed New South Wales's coldest temperature on Sunday with a chilly minus 10.4 after recording minus 9.7 on Saturday. Both temperatures broke July records with the coldest previously recorded as minus 8.5 in 1982.