December weather forecast
Jeju, South Korea

December comes with freezing winds and cold weather, registering lows of 5.3°C (41.5°F) in Jeju. Marking the peak of winter, snowfall periodically blankets the island, turning it into a striking white canvas. The usual hustle of outdoor activities slows down, shifting focus to indoor engagements and hot springs. Despite being the coldest month, December lights up with holiday festivities, illuminating the island with a different kind of warmth. With heavy winter garb, prepared visitors can still indulge in the tranquil allure of the island, making December a unique month on the Jeju's calendar.

Temperature

December in Jeju is characterized by a reduction in the average high-temperature, from a refreshing 16°C (60.8°F) in November to a cool 11°C (51.8°F). The low-temperature average for Jeju during December stands at a cold 5.3°C (41.5°F).

Humidity

In December, the average relative humidity is 65.1%.

Rainfall

December is the month with the least rainfall in Jeju. Rain falls for 10.8 days and accumulates 48mm (1.89") of precipitation.

Sea temperature

In December, the average sea temperature is 15.9°C (60.6°F).
Note: Swimming is not a pleasant activity for most when the water temperature is 15.9°C (60.6°F). As the water temperature drops from 21°C (69.8°F) to 15°C (59°F), breathing becomes more difficult to control.

Daylight

The month with the shortest days is December, with an average of 10h and 0min of daylight.
On the first day of December, sunrise is at 07:19 and sunset at 17:25. On the last day of the month, sunrise is at 07:37 and sunset at 17:36 KST.

Sunshine

The average sunshine in December is 2.7h.

UV index

The months with the lowest UV index are January and December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The maximum daily UV index of 3 in December interprets into the following recommendations:
Exercise prevention - Warding off sunburn is urged. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.