What do the winter solstice, clear skies and light winds make?
The perfect recipe for the coldest Melbourne morning in more than a decade.
Winter signalled its arrival in the city with the temperature dropping to a chilly 2.3C at 6.55am (AEST) on Thursday.
It's the coldest June morning since 2002, when the mercury hit 1.6C, and the equal coldest Melbourne morning since July 7 last year.
It was even colder in Melbourne's outer suburbs - it was minus 4C in Coldstream and minus 1C at Viewbank and Scoresby.
Bureau of Meteorology duty forecaster Geoff Feren said conditions overnight provided the perfect recipe for a cold morning.
"We're only one day away from the winter solstice and that, combined with a high pressure right over most of Victoria, clear skies, dry, low-level air and light winds allows maximum heat loss,'' he said.
Melburnians should be prepared for more chilly mornings, with temperatures likely to be as low as 4C until next Wednesday.