Motorists are urged to proceed with caution after reports of black ice in some parts of the county.
Meanwhile, Met Éireann said it will be bright today across Ulster, with frost and ice clearing. Mostly dry with just the chance of an isolated shower, and low winter sunshine in just light southwest breezes. A chilly day with highest temperatures of 7 to 9 degrees.
Tonight will be dry with clear spells. Lowest temperatures of 3 to 6 degrees with light to moderate southwest winds, freshening later.
It will be mostly cloudy tomorrow and dry to begin, before a band of rain develops in the late morning, clearing in the evening. Windy with fresh to strong southwest winds, veering westerly and moderating. Highest temperatures of 10 to 12 degrees.
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