In December, Hamm typically sees daytime highs of 5.0°C and overnight lows around 0.2°C. Compared to the annual average high of 13.4°C, December runs -8.4°C.
December in Hamm averages a daytime high of 5.0°C and an overnight low of 0.2°C.
December runs -8.4°C compared to Hamm's annual average high of 13.4°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 5.0°C and cooler evenings around 0.2°C.