In December, Dun Laoghaire typically sees daytime highs of 7.9°C and overnight lows around 3.3°C. Compared to the annual average high of 12.7°C, December runs -4.8°C.
December in Dun Laoghaire averages a daytime high of 7.9°C and an overnight low of 3.3°C.
December runs -4.8°C compared to Dun Laoghaire's annual average high of 12.7°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 7.9°C and cooler evenings around 3.3°C.