The mild, moist air, predominantly from the south on Tuesday, saw the thermometer rise to 6.8C during the daytime and early evening and peak at 7.8C at 23.52, which was 0.6C above the 37-year average.
Snow cover remained for much of the day but slowly thawed.
Rain showers during darkness amounted to 2.6mm bringing the monthly total to 58.7mm, which is 68% of the long-term average.
The warmth continued overnight with a reading of 7.6C at 08.00 on Wednesday under low cloud that initially limited visibility to 500m, but thinned by 08.30. The air movement after dawn was static with the anemometer above roof height motionless. The snow cover has now completely disappeared.