In December, Heerlen typically sees daytime highs of 5.2°C and overnight lows around 0.4°C. Compared to the annual average high of 13.3°C, December runs -8.1°C.
December in Heerlen averages a daytime high of 5.2°C and an overnight low of 0.4°C.
December runs -8.1°C compared to Heerlen's annual average high of 13.3°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 5.2°C and cooler evenings around 0.4°C.