December weather forecast
Jeju, South Korea

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A high sunrise Panorama of the Jeju Island in Jeju, South Korea
A high sunrise Panorama of the Jeju Island in Jeju, South Korea

December

Weather in December

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

The arrival of December signals a shift in temperature, down from an enjoyable 16°C (60.8°F) in November to a cool 11°C (51.8°F). The average temperature during December nights is registered at a cold 5.3°C (41.5°F).

Humidity

The average relative humidity in December 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 Jeju, the average seawater temperature in December is 15.9°C (60.6°F).
Note: The majority of people find swimming in 15.9°C (60.6°F) unenjoyable. As the water temperature decreases from 21°C (69.8°F) to 15°C (59°F), breathing becomes more challenging to control.

Daylight

December has the shortest days of the year, 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 unsafe exposure to UV radiation for the ordinary person.
Note: In December, the maximum UV index of 3 suggests this advice:
Adopt protective measures - Suggestions to resist sunburn are offered. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Updated: Aug 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Jeju in December?
The average high-temperature and low-temperature during December are 11°C (51.8°F) and 5.3°C (41.5°F) respectively. The average heat index (a.k.a. 'real feel', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in August is appraised at 36°C (96.8°F).
What is the average humidity in December in Jeju?
In December, the average relative humidity is 65.1%.
What is the driest month?
December is the month with the least rainfall. Rain falls for 10.8 days and accumulates 48mm (1.89") of precipitation.
How much does it rain in December?
In December, the rain falls for 10.8 days. Throughout December, 48mm (1.89") of precipitation is accumulated.
How cold is the water in December?
In Jeju, the average seawater temperature in December is 15.9°C (60.6°F). For swimming, a surface water temperature of 15.9°C (60.6°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).
What is the month with the shortest days?
With an average of 10h and 0min of daylight, December has the shortest days of the year.
How many hours of daylight does Jeju have in December?
In Jeju, the average day length in December is 9h and 59min.
What time are sunrise and sunset in December?
In December, on the first day of the month, 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.
How long on average sun shines in December?
In Jeju, South Korea, the average sunshine duration in December is 2.7h.
What are the months with the lowest UV index?
The months with the lowest UV index are January and December, with an average maximum UV index of 3.
What is the UV index intensity in December?
The average daily maximum UV index in December is 3. A UV Index estimate of 3 to 5 represents a moderate health threat from unsafe exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMJJASONDecember
Nov
December
Jan
Average high temperature
16°C
11°C
8.3°C
Average low temperature
9.8°C
5.3°C
3.2°C
Average humidity
65.1%
65.1%
65.3%
Average rainfall
61.9mm
47.7mm
65.2mm
Average rainfall days
9.3
10.8
12.6
Average sea temperature
18.9°C
15.9°C
14.8°C
Average daylight
10h 2min
10h 0min
10h 1min
Average sunshine
4h 1min
2h 4min
2h 2min
Average UV index
4
3
3
Average temperature in December - Jeju, South Korea
Average temperature in December
Jeju, South Korea
  • Average high temperature in December: 11°C

The warmest month (with the highest average high temperature) is August (29.8°C).
The month with the lowest average high temperature is January (8.3°C).

  • Average low temperature in December: 5.3°C

The month with the highest average low temperature is August (24.3°C).
The coldest month (with the lowest average low temperature) is January (3.2°C).

Average humidity in December - Jeju, South Korea
Average humidity in December
Jeju, South Korea
  • Average humidity in December: 65.1%

The month with the highest relative humidity is July (78.3%).
The months with the lowest relative humidity are February and March (64.9%).

Average rainfall in December - Jeju, South Korea
Average rainfall in December
Jeju, South Korea
  • Average rainfall in December: 47.7mm

The wettest month (with the highest rainfall) is August (262.5mm).
The driest month (with the least rainfall) is December (47.7mm).

Average rainfall days in December - Jeju, South Korea
Average rainfall days in December
Jeju, South Korea
  • Average rainfall days in December: 10.8 days

The month with the highest number of rainy days is August (13.5 days).
The month with the least rainy days is October (7 days).

Average sea temperature in December - Jeju, South Korea
Average sea temperature in December
Jeju, South Korea
  • Average sea temperature in December: 15.9°C

The best month for swimming (with the highest average sea temperature) is August (26.2°C).
The coldest month (with the lowest average sea temperature) is March (13.3°C).

Average daylight in December / Average sunshine in December - Jeju, South Korea
Average daylight in December /
Average sunshine in December
Jeju, South Korea
  • Average daylight in December: 10h and 0min

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in December: 2h and 4min

The month with the most sunshine is May (Average sunshine: 6h and 48min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).

Average UV index in December - Jeju, South Korea
Average UV index in December
Jeju, South Korea
  • Average UV index in December: 3

The month with the highest UV index is July (UV index 11).
The months with the lowest UV index are January and December (UV index 3).

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