© Rebekah HallFurther overnight snow continues to cause disruption across Northern Ireland.
A further 10 to 15cms of snow fell in some areas and the freezing conditions have made roads hazardous.
BBC weather presenter Angie Philips said temperatures would again remain low on Monday, with conditions on the roads "treacherous".
"Temperatures will fall dramatically tonight, maybe getting down below minus 15 celsius in the Castlederg area again, but many rural parts of the west probably dipping below minus 10 celsius," she said.
"A severe frost will develop, with very icy conditions persisting over frozen and compacted snow. Some freezing fog is likely in places again too," she added.
The extra snow has caused hundreds of schools across the North to remain closed and train services have also been affected by the weather.
Ciaran Rogan of Translink said bus services were "sticking to main roads", and some delays were expected on the Goldline service.
Cancellations on the Dublin-Derry bus route have also occurred.
The Roads Service have carried out salting and snow-ploughing operations throughout the weekend, but have warned that driving conditions were still hazardous with overnight snow leaving a risk of ice.
Belfast International and George Best Belfast City Airport are open but cancellations and delays are expected to continue while City of Derry airport is closed until at least 10.00am.
Cancellations in Britain and the continent are having knock-on effects in the six counties.
Flights to Belfast International Airport from Heathrow and London Stansted are cancelled this morning because of issues in London.
Airports have advised passengers to contact their airlines before travelling.
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