Average temperature within Cornwall right-through December is 6 with highs being 9 and low of 6 degrees celsius. We have put some more detail below here:
| Month | Degrees Celsius |
|---|---|
| Temperature | 6 |
| High Temperature | 9 |
| Low Temperature | 6 |
| Sunshine Per Day | 3 |
Useful Links: Cornwall Weather: Average Weather & Yearly Climate