Sleet and snow have made driving difficult in some areas of the country this morning and flights to and from the UK have been disrupted by heavy snow there.
Border counties and the West were worst-affected with snowfall of 4cm reported in some areas, causing dangerous driving conditions.
Met Éireann spokesman
A spokesman for Met Éireann told ireland.comthis morning that the snowfall "wasn't quite as widespread as we thought it might be".
"The potential was there but it didn't materialise because of a small percentage change in temperature. In some cases it started off as rain the snow didn't lie.
"There is plenty of snow around. There is snow in Knock, Clones, Mullingar and sleet in Casement."
Roads on high ground and rural areas remain dangerous today. AA Roadwatch warned of particularly difficult conditions in counties Monaghan, Cavan, Galway, Mayo, Roscommon, Wicklow and midland counties. Snow also caused problems in some Dublin suburbs especially around Tallaght, Sandyford and Lucan.
Northern Ireland has had higher levels of snowfall and in Britain more extreme conditions has led to transport disruption.
The Met Éireann spokesman said the same weather front that passed over Ireland overnight caused significant snow in the United Kingdom because of its bigger landmass and slightly lower temperatures.
Three Ryanair flights and two British Airways flights to airports serving the Greater London Area were cancelled and further disruption is expected today.
A number of flights due to arrive from London into Dublin were also cancelled.
A spokeswoman for the Dublin Airport Authority said: "Dublin is fully operational but there has been some disruption because of adverse weather in the UK.
"The advice to passengers is to contact their airlines or their airline's websites before setting off for Dublin Airport".
Despite teams of staff at Heathrow working overnight to keep the UK's busiest airport open, 32 flights were still cancelled this morning.
A Heathrow spokesman said although it had used specialist equipment to keep runways and taxiways open, airlines themselves were responsible for de-icing aircraft.
Gatwick Airport said 40 flights, both arrivals and departures, had been cancelled during the morning. But despite the disruption, the airport's runway was open and flights were taking off and landing.
Bristol International Airport's runway reopened at 8.45am after being closed for more than an hour to allow workers to clear snow, but passengers were warned to expect delays throughout the morning.
Cardiff International Airport, said its runway was being reopened after it was closed earlier while Birmingham Airport reopened its runway at 9am but also warned that there were likely to be delays throughout the day.
