Worst areas to avoid around country
Roads were very dangerous in Co Louth and "treacherous in parts" of the N2.
Several secondary roads in counties Cavan and Monaghan were impassible.
In Co Meath, the water supply was fully restored in the Navan area although reduced pressure may be experienced in some rural areas.
Dublin remained largely snow-free, but sub-zero temperatures made driving conditions dangerous.
The Wicklow and Sally gaps were treacherous, and motorists were urged to avoid Enniskerry.
Roads in counties Carlow, Kilkenny, Waterford and Wexford remained treacherous, with black ice reported in places.
Householders were urged not to leave their taps running.
Parts of Co Cork were brought to a standstill after heavy snowfalls resulted in some roads resembling skating rinks.
The Conor Pass in Co Kerry remained closed because of black ice.
While heavy frost and ice caused problems for motorists, the mid-west escaped the worst of the Arctic conditions, but racing at Thurles was called off due to a frozen track.
Roads in Co Mayo were treacherous with minor roads, especially in upland areas, only passable by tractors or 4x4 vehicles.
There were acute water shortages in the county, with householders urged to conserve supplies.
In Letterkenny, Co Donegal, business came to a virtual standstill after 25cm of snow fell over the weekend.
In counties Sligo and Leitrim, icy conditions also made for hazardous driving conditions and motorists were being asked to avoid hilly areas where possible and only embark on essential journeys.
Severe ice caused problems on the M6 Dublin-Galway road, where a number of collisions occurred. Ice in Co Offaly made the N61 Kinnity-Mountrath road impassable.