The average daily temperature in Cupertino in December is 9 with a normal high in the month being 15 degrees celsius with a low of 6. We have put some more information below:
| Month | Degrees Celsius |
|---|---|
| Temperature | 9 |
| High Temperature | 15 |
| Low Temperature | 6 |
Useful Links: Cupertino Weather: Average Weather & Yearly Climate