In December, Heilbron typically sees daytime highs of 27.9°C and overnight lows around 13.3°C. Compared to the annual average high of 24.1°C, December runs +3.8°C.
December in Heilbron averages a daytime high of 27.9°C and an overnight low of 13.3°C.
December runs +3.8°C compared to Heilbron's annual average high of 24.1°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 27.9°C and cooler evenings around 13.3°C.