Latest: Met Eireann says the worst is over but low temperatures expected all week

Latest: Met Eireann says the worst is over weather-wise but it is going to stay cold all week.

Update 10am: Met Eireann says the worst is over weather wise but it is going to stay cold all week.

Temperatures dropped as low as minus 8 just before dawn, and should reach no more than 4 degrees later.