The average daily temperature in San Bernardino throughout the duration of December is 26 with a typical high being 34 and low average expected to be 21 degrees. We have put some more details below:
| Month | Degrees Celsius |
|---|---|
| Temperature | 26 |
| High Temperature | 34 |
| Low Temperature | 21 |
Useful Links: San Bernardino Weather: Average Weather & Yearly Climate