Temperatures are set to plummet again after dark as March begins with the current cold spell lingering throughout the country.
Widespread frost and some fog patches gave way early today to a generally dry and bright day with sunny spells everywhere.
Scattered wintry showers were confined mostly to Ulster.
Met Eireann forecasters said tonight would be dry and very cold with widespread sharp or severe frost again with some fog patches.
Temperatures may drop to as low as -5C in some areas.
The frost may ease later in some exposed western and southern areas with the arrival of a freshening breeze.
The dry spell will continue tomorrow, with a mix of cloud and sunny spells.
Overnight fog and frost will clear tomorrow morning as breezier weather reaches most areas. Temperatures may climb to between 6 to 10C.
Met Eireann said tomorrow night and Wednesday would be breezier.
Cloudy weather will gradually move in from the Atlantic, bringing outbreaks of rain to some parts of the country, especially the south and west.
There will be some heavy bursts of rain in places. Many areas will be free of frost tomorrow night but it will remain fairly cold overall.
Rain may even turn to snow on Wednesday, mainly on the mountains.
Rain, and any snow, will die out later on Wednesday or early on Thursday and skies will be clear at times.
There will be frost in places on Thursday night.
The cold spell will continue into Friday with frost widespread at night.
It will be dry much or all of the time, with some sunshine, but there may be a little rain or sleet in places.