December likely to be coldest ever
Forecasters have predicted the coldest December on record with more snow on the cards and biting temperatures lasting at least six days.
The north and west have borne the brunt of the latest wintry conditions, but snow is to expected to spread across the country with up to 10cm possible in northern parts.
Road chiefs claimed salt supplies are being used to keep national roads open, but they admitted concerns among local authorities about regional and back routes.
Dublin City Council said water restrictions would remain in place but vowed to have a full supply over Christmas week.
Met Eireann forecaster Gerald Fleming said the latest cold snap could make December 2010 a record breaker.
"It's certainly looking that this December, in terms of our records in Met Eireann, could well turn out to be the coldest December on record, it's heading in that direction," he said.
Temperatures plummeted as low as minus 4C on Thursday night with snow hitting counties across Northern Ireland as well as Donegal, Mayo and Galway before spreading inland to Longford, Cavan, Roscommon and Offaly.
Mr Fleming said showers will affect all areas and particularly the east coast over the weekend as the weather front moves out to the Irish Sea.
He could not say which areas will be the worst hit, but predicted the early days of next week would likely be dry but cold.
He said temperatures may begin to gradually rise on Wednesday or Thursday, but admitted the second big freeze of the winter could continue into Christmas week.