December weather forecast
Seoul, South Korea

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. With approaching January, the winter intensifies, and temperatures continue to drop further.

Temperature

Observing a mild shift, the average high-temperature during December reduces from November's fresh 11.6°C to a cold 4.3°C. December brings with it a nighttime average temperature of -3.2°C.

Humidity

In December, the average relative humidity is 60.6%.

Rainfall

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

Daylight

December has the shortest days of the year, with an average of 9h and 36min of daylight.
On the first day of December, sunrise is at 07:27 and sunset at 17:14. On the last day of the month, sunrise is at 07:46 and sunset at 17:23 KST.

Sunshine

The average sunshine in December is 4.9h.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum high UV index of 2 in December translates into the following recommendations:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.