Normally the weather in Aviano throughout the duration of December is 12. With the average high being 18 with low temperatures being around 9 degrees celsius. We have put some more detail below here:
| Month | Degrees Celsius |
|---|---|
| Temperature | 12 |
| High Temperature | 18 |
| Low Temperature | 9 |
Useful Links: Aviano Weather: Average Weather & Yearly Climate