In December, Belfast typically sees daytime highs of 7.0°C and overnight lows around 3.0°C. Compared to the annual average high of 12.0°C, December runs -4.9°C.
December in Belfast averages a daytime high of 7.0°C and an overnight low of 3.0°C.
December runs -4.9°C compared to Belfast's annual average high of 12.0°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 7.0°C and cooler evenings around 3.0°C.