Normally, you can expect the weather in Boise all through the month of December is 0. You can expect a high of 5 with low temperatures being around -6 celsius. The table below includes more detail:
| Month | Degrees Celsius |
|---|---|
| Temperature | 0 |
| High Temperature | 5 |
| Low Temperature | -6 |
Useful Links: Boise Weather: Average Weather & Yearly Climate