There will be freezing fog over the northern half of Ireland this morning with a Status Yellow alert in place for nine areas.
The warning is valid for Connacht, Cavan, Donegal, Monaghan, Longford, Louth, Meath, Offaly, Westmeath until 10am on Tuesday.
Met Eireann warned that road conditions will be "very hazardous", particularly on minor roads, with icy conditions in many parts of the country.
It reads: "Patches of freezing fog will persist overnight Monday and into Tuesday morning leading to hazardous driving conditions in some areas."
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Meanwhile, the Arctic blast continues until the end of the week as a Status Yellow low temperature and icy weather warning remains in place for the entire country until Friday, December 16.
It will continue to be very cold on Tuesday and frost and ice will persist through much of the day. Rain and sleet will fall in the southwest of the country but will fall as snow in places away from the coast and on higher ground.
It will be dry for most areas, with brighter conditions in the north and daytime temperatures will range from -1 to 4C in light to moderate northeasterly winds, fresher in the southwest.
Tuesday night will be very cold but generally dry with a chance of isolated wintry showers near coasts. Widespread frost and ice are expected with minimum temperatures of -5 to 1C.
On Wednesday things will be generally dry with a good deal of crisp winter sunshine and a chance of isolated wintry showers near coasts. Highest temperatures will range from 1 to 5C in mainly light northerly breezes.
On Wednesday night, temperatures will plunge down to -6C once again.
Thursday will be largely dry and bright with afternoon temperatures of 2 to 5C and some occasional wintry showers continuing in the north and northwest. It will be bitterly cold on Thursday night with temperatures -7C and weather models show they could plummet further to -10 locally.
Friday will see the arrival of showers of rain and sleet which will move west during the day, although much of the midlands, south, and east will remain dry.
Saturday will be a dry and bright day, apart from isolated coastal showers in the south and west with daytime temperatures of 2 to 6C.
As for Sunday and into next week, there is a good deal of uncertainty in the forecast but current forecasts suggest that it will turn more unsettled and milder with spells of rain at times.
Met Eireann's long-range weather forecast has predicted that on Christmas week, from Monday, December 19, to Sunday, December 25, temperatures will trend "slightly closer to normal".
We could still see a white Christmas this year as the national forecaster said there is a possibility of rain showers to have "wintry precipitation".
It reads: "While most areas will be drier than normal, the east and south will remain slightly wetter, with more frequent showers there. There is some potential for wintry precipitation in these showers, with the ongoing possibility of frost and ice."
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