Drivers are being urged to be very careful on the roads this morning after temperatures dropped to minus-five in parts overnight.
A status yellow low-temperature alert was in place for all of Connacht, along with Cavan, Monaghan, Donegal, Longford and Clare.
The weather warning was in effect until 10am this morning, but Met Éireann is warning of icy conditions for much of the day.
In Cork, there were reports of icy conditions on several roads, including between Kanturk and Banteer, and between Banteer and Nad
Cathal Nolan, from Ireland's Weather Channel, says the cold snap will continue for the rest of the week.
"It is rare for us to have temperatures this low," he said.
"I suppose during the winter months we'd typically see temperatures fall below freezing on certainly upwards of 20 or 30 nights a year.
"However, at the moment we are seeing exceptionally cold temperatures and they are dipping well below that again further as I said emphasised by the low temperatures we've experienced last night.
"Certainly we are in the midst of a particularly cold spell."