Usually the weather in Altdorf right-through January is 3. Average high is typically 5 and low average expected to be -2 celsius. We have put some more information here:
| Month | Degrees Celsius |
|---|---|
| Temperature | 3 |
| High Temperature | 5 |
| Low Temperature | -2 |
| Sunshine Per Day | 3 |
Useful Links: Altdorf Weather: Average Weather & Yearly Climate