Kerry experienced seven days of ground frost last month.
According to the monthly weather summary from Met Eireann, the lowest air temperature recorded at Valentia Observatory during January was -0.8 degrees Celsius.
In January, all weather stations across the country reported ground frost, with the lowest air temperature of -6.8 degrees being recorded in Athenry, Co Galway.
The lowest air temperature recorded at Valentia Observatory of -0.8 degrees occurred on the 7th of January, while the lowest grass minimum recorded at the South Kerry weather station was -5.4 degrees on the same date.
Dublin Airport experienced nine days of air frost, the highest number nationally.