On higher ground, nighttime temperatures are set to plunge to -7C while Dublin City will be hit by -4C conditions tonight.
Snow and ice is causing treacherous driving conditions in parts of Dublin, Meath, Cavan and Monaghan today with heavier snowfalls reported in Cork and Kerry.
In Dublin, snow around Ballymun and Finglas early today caused serious problems for drivers.
Slushy and slippery conditions were reported on the M50 around Ballinteer while road conditions around Glencullen, Ticknock, Stepaside and Kilternan were dangerous after sleet and snow showers.
There was also heavy snowfall in the Dundrum and Stepaside areas with parts of the M50 affected.
The 2013 freeze is showing no signs of letting up, with forecasters predicting we will require our winter woolies at least until the weekend.
Night temperatures will continue to plummet to -5C until some milder weather arrives on Friday, a Met Eireann forecaster told the Herald. And air travellers destined for the UK and locations across northern Europe have been warned to prepare for further disruption to flights with heavy snowfalls.
All passengers were told to check with their airline's website for the latest information before travelling to the airport.
Snow showers expected to hit eastern counties, parts of Ulster and inland areas in Munster, with between 3cm and 6cm of snow overnight.
"Over the next seven days, the temperatures overall are between 1C and almost 4C below normal," said a forecaster.