PA Media
Brothers Eoin and Rory, from Antrim, with their snowman in Antrim Castle Gardens
An ice warning remains in place across Northern Ireland on Wednesday morning as the cold snap continues.
The Met Office has warned that clearing skies and scattered wintry showers may bring icy patches and some disruption.
A fresh dusting of snow can also be expected in some areas.
The alert kicked in at 18:00 GMT on Tuesday and lasts until 11:00 GMT on Wednesday.
Four schools have so far announced they will be closed on Wednesday.
In the north east, Duneane Primary School in Toomebridge, Magherafelt Primary School and Oakfield Primary School in Carrickfergus are shut.
The Royal School Armagh is also closed.
Wintry weather closed about 200 schools on Monday and more than 200 schools on Tuesday.
A duck walking on a frozen lake at Black Lough outside Dungannon
On Tuesday NI Water urged people to be careful around its outdoor sites, particularly reservoirs and dams, where winter conditions can create hazards.
Reservoir safety and compliance area manager Derek McKane said ice was “nearly always treacherous” and people should not attempt to walk or skate on iced-over reservoirs.
“Reservoirs are not safe places to play at any time of year, but winter brings extra dangers,” he added.
What is the coldest it’s ever been in Northern Ireland?
The lowest temperature ever recorded in NI was -18.7C at Castlederg in Tyrone during the big freeze of December 2010.
The lowest temperature ever recorded on the island of Ireland was -19.1C at Markree in Sligo in January 1881.