December weather forecast
Seoul, South Korea

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The Dongdaemun Gate in Seoul city, South Korea
The Dongdaemun Gate in Seoul city, South Korea

Weather in December

December marks the advent of winter, with temperatures diving into chilly lows. The streets are adorned with warm festive decorations, lighting up Seoul's winter spell. Hot street food serves as the city’s defense against the falling mercury. Vicinities turn to a winter wonderland as snow starts covering the ground, with the lower temperature averaging at -3.2°C (26.2°F). With approaching January, the winter intensifies, and temperatures continue to drop further.

Temperature

In Seoul, entering December brings a temperature decrement, reducing from November's fresh 11.6°C (52.9°F) to a cold 4.3°C (39.7°F). In the month of December, the average low-temperature in Seoul, South Korea, usually rests at a freezing cold -3.2°C (26.2°F).

Humidity

In Seoul, the average relative humidity in December is 60.6%.

Rainfall

In Seoul, in December, it is raining for 7.4 days, with typically 22mm (0.87") of accumulated precipitation. In Seoul, during the entire year, the rain falls for 108.8 days and collects up to 1451mm (57.13") of precipitation.

Daylight

With an average of 9h and 36min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 07:28 and sunset at 17:14. On the last day of the month, sunrise is at 07:46 and sunset at 17:23 KST.

Sunshine

In Seoul, the average sunshine in December is 4.9h.

UV index

The months with the lowest UV index are January and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: In December, a daily maximum UV index of 2 leads to the following instructions:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.

Frequently asked questions

How cold is December?

In December, in Seoul, the average high-temperature is 4.3°C (39.7°F), and the average low-temperature is -3.2°C (26.2°F). The average heat index (a.k.a. 'real feel', 'feels like'), which factors the actual air temperature with the relative humidity, in August is computed to be 35°C (95°F).

What is the average humidity in December?

The average relative humidity in December is 60.6%.

How many days does it rain in December in Seoul?

In December, the rain falls for 7.4 days. Throughout December, 22mm (0.87") of precipitation is accumulated.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 36min of daylight.

How many hours of daylight does Seoul have in December?

In Seoul, the average day length in December is 9h and 37min.

What time are sunrise and sunset in December in Seoul?

In December, on the first day of the month, sunrise is at 07:28 and sunset at 17:14. On the last day of the month, sunrise is at 07:46 and sunset at 17:23 KST.

How long on average sun shines in December?

In Seoul, the average sunshine duration in December is 4.9h.

What are the months with the lowest UV index?

January and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index reading in December?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in December
Seoul, South Korea

Average temperature in December - Seoul, South Korea
  • Average high temperature in December: 4.3°C

The warmest month (with the highest average high temperature) is August (29.6°C).
The month with the lowest average high temperature is January (1.5°C).

  • Average low temperature in December: -3.2°C

The month with the highest average low temperature is August (22.4°C).
The coldest month (with the lowest average low temperature) is January (-5.9°C).

Average humidity in December
Seoul, South Korea

Average humidity in December - Seoul, South Korea
  • Average humidity in December: 60.6%

The month with the highest relative humidity is July (78.3%).
The month with the lowest relative humidity is April (56.2%).

Average rainfall in December
Seoul, South Korea

Average rainfall in December - Seoul, South Korea
  • Average rainfall in December: 21.5mm

The wettest month (with the highest rainfall) is July (394.7mm).
The driest month (with the least rainfall) is January (20.8mm).

Average rainfall days in December
Seoul, South Korea

Average rainfall days in December - Seoul, South Korea
  • Average rainfall days in December: 7.4 days

The month with the highest number of rainy days is July (16.3 days).
The month with the least rainy days is February (5.8 days).

Average daylight in December /
Average sunshine in December
Seoul, South Korea

Average daylight in December / Average sunshine in December - Seoul, South Korea
  • Average daylight in December: 9h and 4min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is May (Average sunshine: 6h and 54min).
The month with the least sunshine is July (Average sunshine: 3h and 54min).

Average UV index in December
Seoul, South Korea

Average UV index in December - Seoul, South Korea
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 10).
The months with the lowest UV index are January and December (UV index 2).

Seoul, South Korea

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