Normally average temperatures in Yakima throughout the duration of December is 0 with highs being 4 with low average temperatures being -6 celsius. The table below includes more detail:
| Month | Degrees Celsius |
|---|---|
| Temperature | 0 |
| High Temperature | 4 |
| Low Temperature | -6 |
| Sunshine Per Day | 6 |
Useful Links: Yakima Weather: Average Weather & Yearly Climate