In January, Heidelberg typically sees daytime highs of 3.3°C and overnight lows around -1.9°C. Compared to the annual average high of 14.2°C, January runs -10.9°C.
January in Heidelberg averages a daytime high of 3.3°C and an overnight low of -1.9°C.
January runs -10.9°C compared to Heidelberg's annual average high of 14.2°C, ranking #12 of 12 months by warmth.
Plan for daytime highs near 3.3°C and cooler evenings around -1.9°C.