Typically, you can expect that the weather in Copper Mountain all through December is -8. Average highs are typically -6 and low average expected to be -12. The table below has further info:
| Month | Degrees Celsius |
|---|---|
| Temperature | -8 |
| High Temperature | -6 |
| Low Temperature | -12 |
Useful Links: Copper Mountain Weather: Average Weather & Yearly Climate