Hundreds of schools are again closed in Northern Ireland with more snow overnight.
Northern Ireland’s airports are open but cancellations and delays are expected to continue throughout Monday.
Temperatures in NI dipped to their lowest on record with -18C recorded at Castlederg, County Tyrone.
There has been a further 10 to 15cms of snow in some places, with freezing conditions making 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 added.
“A severe frost will develop, with very icy conditions persisting over frozen and compacted snow.
“Some freezing fog is likely in places again too.”
A severe weather warning was in place for heavy snow showers across parts of Counties Londonderry, Antrim and Down on Sunday night.
Travel in and to Northern Ireland was affected on Sunday.
Northern Ireland’s airports were open, as were Dublin, Cork and Shannon, but they were experiencing a high number of cancellations and delays.
The Roads Service warned that driving conditions were still hazardous with overnight snow leaving a risk of ice.
Roads Service staff carried out salting and snow-ploughing operations throughout Saturday night and into Sunday morning.
The three Northern Ireland airports have advised passengers to contact their airlines before travelling because of the knock-on from Friday and Saturday.
Gatwick had hundreds of people sleeping in its terminals on Saturday night, Heathrow thousands.
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