Normally the average daily weather in Monte Carlo right-through April is 12. Highs are around 16 and lows around 12 celsius. We have put some more information here:
| Month | Degrees Celsius |
|---|---|
| Temperature | 12 |
| High Temperature | 16 |
| Low Temperature | 12 |
| Sunshine Per Day | 11 |
Useful Links: Monte Carlo Weather: Average Weather & Yearly Climate