Sunshine lasts for nine hours per day with an average humidity of 75%. Winds are around 3mph in the mainland but speed up towards the coastal areas that receive winds blowing over the sea. The average rainfall is around 70mm over the month, so it's likely you'll need a raincoat.
How is Mykonos in December?
The Average Daily Temperature in December Compared to Other Months. The average temperature during this period varies from a low of 46°F(8°C) to a high of 55°F (13°C). Compared to average temperatures in November, this is about 39°F (4°C) lower.