In December, Heilbronn typically sees daytime highs of 4.1°C and overnight lows around -1.2°C. Compared to the annual average high of 14.0°C, December runs -9.9°C.
December in Heilbronn averages a daytime high of 4.1°C and an overnight low of -1.2°C.
December runs -9.9°C compared to Heilbronn's annual average high of 14.0°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 4.1°C and cooler evenings around -1.2°C.