Ireland's weather is set to turn extremely cold this week with snow a possibility on higher ground.
Met Eireann is forecasting a number of freezing nights with Monday, Tuesday and Wednesday night all expected to be bitterly cold.
And Carlow Weather's Alan O'Reilly has said that snow is a possibility on Tuesday and Wednesday on "very high ground".
The weather will begin to turn very cold from Monday with daytime temperatures remaining close to freezing.
A Met Eireann forecaster said: "Turning colder for the week ahead with outbreaks of rain and drizzle at times to start. Becoming more settled for the end of the week but remaining cold.
"Lowest temperatures of -1 to +3 degrees on Monday night with the risk of frost and icy patches in a light southerly or variable breeze.
"Overall cloudy on Tuesday with patchy outbreaks of rain and drizzle mainly over the southern half of the country.
"A cold day with a light easterly breeze and highest temperatures of 3 to 6 degrees generally, but a degree or two higher in the south.
Rain will become more widespread and persistent overnight Tuesday with a moderate northwest breeze.
"Lowest temperatures of 0 to 4 degrees over the northern half of the country and 4 to 6 degrees over the southern half, occurring early in the night.
"Current indications suggest that Wednesday will be a mostly cloudy day with patchy outbreaks of rain and drizzle, gradually becoming more confined to coastal areas.
"Highest temperatures of 5 to 7 degrees in moderate to fresh and gusty northerly winds.
Becoming mostly dry and clear on Wednesday night, though patchy drizzle will persist on coasts. A cold night with lowest temperatures of -1 to +3 degrees with a risk of frost and icy patches in moderate northerly winds."
And the forecast doesn't change all that much for Christmas with chilly conditions but little chance of any snow.
The forecaster added: "Christmas Eve looks set to be cold with sunny spells. A dry day for most but there will be isolated light showers on coasts. Highest temperatures of 4 to 7 degrees in a light to moderate northerly breeze.
"Staying mainly dry with long clear spells and a light northerly or variable breeze on Thursday night, perfect for Santa's big flight. It will be a cold night with the risk of widespread frost.
"At the moment, Christmas Day looks set to be cold but mainly dry and bright. However, there is the chance of patchy rain and drizzle developing in the northwest later."
