In December, Ulm typically sees daytime highs of 2.1°C and overnight lows around -3.4°C. Compared to the annual average high of 11.9°C, December runs -9.8°C.
December in Ulm averages a daytime high of 2.1°C and an overnight low of -3.4°C.
December runs -9.8°C compared to Ulm's annual average high of 11.9°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 2.1°C and cooler evenings around -3.4°C.