December weather forecast and climate
Seoul, South Korea

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

Weather in December

The first month of the winter, December, is still a cold month in Seoul, South Korea, with average temperature fluctuating between -3.2°C (26.2°F) and 4.3°C (39.7°F).

Temperature

In Seoul, the average high-temperature in December drops, from a cool 11.6°C (52.9°F) in November, to a wintry 4.3°C (39.7°F). In December, the average low-temperature is -3.2°C (26.2°F).

Humidity

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

Rainfall

In December, the rain falls for 7.4 days. Throughout December, 21.5mm (0.85") of precipitation is accumulated. In Seoul, during the entire year, the rain falls for 108.8 days and collects up to 1450.6mm (57.11") of precipitation.

Daylight

December has the shortest days of the year, with an average of 9.6h of daylight.

Sunshine

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

UV index

Months with the lowest UV index in Seoul are January and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the average humidity in December in Seoul?

The average relative humidity in December is 60.6%.

How much does it rain in Seoul in December?

In Seoul, South Korea, in December, it is raining for 7.4 days, with typically 21.5mm (0.85") of accumulated precipitation.

What is the month with the shortest days in Seoul?

The month with the shortest days in Seoul, South Korea, is December, with an average of 9.6h of daylight.

What is the average length of the day in December in Seoul?

In Seoul, South Korea, the average length of the day in December is 9.6h.

How many hours of sunshine does Seoul have in December?

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

When is the lowest UV index in Seoul?

Months with the lowest UV index in Seoul, South Korea, are January and December, with an average maximum UV index of 2.

What is the UV index intensity in December in Seoul?

In December, the average daily maximum UV index in Seoul, South Korea, is 2. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to the Sun's UV rays.

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).

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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%).

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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).

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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).

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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: 9.6h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in December: 4.9h

The month with the most sunshine is May (Average sunshine: 6.9h).
The month with the least sunshine is July (Average sunshine: 3.9h).

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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).
Months with the lowest UV index are January and December (UV index 2).

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