A cold snap gripped the country last night, with lows of minus 6.5C recorded in places.
The freezing overnight temperatures will leave a lot of ice behind, so motorists are advised to drive with extreme caution this morning.
The counties of Monaghan and Cavan are reported to be particularly bad, and parts of Waterford and Kilkenny are shrouded in thick fog.
A yellow weather warning remains in effect this morning.
In contrast, the outlook for the dying days of 2014 is somewhat milder.
Daytime temperatures of between 9-11C are predicted for New Year’s Eve, and 12C may be reached on New Year’s Day.