Normally the weather in Shannon throughout the time of December is 5. Highs are around 9 and typical average low being around 5 degrees celsius. We have put some more detail below here:
| Month | Degrees Celsius |
|---|---|
| Temperature | 5 |
| High Temperature | 9 |
| Low Temperature | 5 |
| Sunshine Per Day | 3 |
Useful Links: Shannon Weather: Average Weather & Yearly Climate