Generally, average daily wearther in Viterbo during the duration of December is 4 with the high being 9 and low of 2 degrees. With the details being further below:
| Month | Degrees Celsius |
|---|---|
| Temperature | 4 |
| High Temperature | 9 |
| Low Temperature | 2 |
| Sunshine Per Day | 4 |
Useful Links: Viterbo Weather: Average Weather & Yearly Climate