The majority of monthly mean air temperatures were on or slightly below their long-term averages (LTA), with marginally above average values recorded in isolated parts of the Southwest and Northwest.
According to Met Eireann, monthly mean temperatures ranged from 3.7°C at Knock Airport (-0.3°C from its LTA) to 7.6°C at Sherkin Island (0.1 from its LTA).
Differences from LTA ranged from -0.6°C at Dublin Airport, Ballyhaise and Athenry to 0.2°C at Finner.
Highest maxima were recorded on the 1st and 9th, with the month’s highest temperature of 16.2°C reported at Carlow (Oak Park) on January 9 as a southwesterly airflow dominated.
Oak Park reported its highest January temperature in eight years. Shannon Airport reported a highest maximum of 14.7°C also on January 9, its highest for January since 1993, with most other places reporting their highest January maxima in six to 17 years.
Lowest air and grass minimums were recorded between January 17-19, as a northwesterly airflow dominated, with both the month’s lowest air and grass temperatures recorded on January 19. The lowest air temperature was -6.2°C at Dunsany with the lowest grass minimum of -10.5°C reported at Casement Aerodrome.
The highest number of days with ground frost was 26 at Dublin (Phoenix Park), while the highest number of days with air frost was 11 at stations in the Midlands.