Generally, you can anticipate the weather in Heidelberg in the month of December is 5 with a general average high of 6 and low being 1. Our table below has the full details:
| Month | Degrees Celsius |
|---|---|
| Temperature | 5 |
| High Temperature | 6 |
| Low Temperature | 1 |
Useful Links: Heidelberg Weather: Average Weather & Yearly Climate