Seongnam Weather in December
December in Seongnam sees daytime temperatures around 5°C (41°F) and lows of -5°C (23°F) at night. Pack a rain jacket because some snow/rainfall is likely.
Rainfall in Seongnam in December
On average, there are about 8 days with snow/rain during this month, averaging 27 mm (1.1 in). The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.
Temperature in Seongnam in December
In December, expect low temperatures in Seongnam, with highs of 5°C (41°F) and lows of -5°C (23°F) at night. December is part of the winter season. The days stay cool from start to finish. Layering up well will make outdoor time much more comfortable. Nights drop below freezing to -5°C (23°F). An extra blanket is worth packing if you're unsure about the heating where you're staying.
Sunshine in Seongnam in December
With about 163 hours of sunshine, the area enjoys a nice balance of sun and overcast, creating a pleasant environment.
Wind Speed in Seongnam in December
Wind speeds average 2 m/s (4 knots) during December. At this speed, expect light breezes that you can feel on your face and cause leaves to rustle gently. Since this is an average, some days are calmer with barely any wind while others have more noticeable gentle breezes.If you prefer dry days with pleasant temperatures, October typically offers the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit South Korea, check out our Seongnam's climate page.
Seongnam Temperature in December
Min Temperature
-5°C (23°F)
Max Temperature
5°C (41°F)
Chance of Rain
26%
Precipitation
27 mm (1.1 in)
Rainy days
8 days
Humidity
58% *
Windspeed
2 m/s (4 knots) *
Sunshine
163 hours *
Percentage Sunshine
49% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Seongnam typically drop from around 7°C (45°F) at the start of December to approximately 2°C (36°F) by the end. Nights are very cold, with lows typically ranging from -8°C (18°F) to -3°C (27°F).
Average temperatures in December
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather for Seongnam in December
Browse day-by-day weather records for Seongnam spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Seongnam historical weather extremes in December
According to our 49 years of weather records for Seongnam, the following extremes were recorded between 1976 and 2025.
- Seongnam recorded its highest December temperature of 17°C (63°F) on December 8, 2023.
- Seongnam experienced its chilliest December day on December 27, 1976, reaching only -9°C (16°F).
- Seongnam registered its coldest December night on December 30, 1980, with temperatures dropping to -20°C (-4°F).
Best Places in South Korea in December
Find out more about the weather in South Korea and which places have the best travel conditions in this month. See all of South Korea in December →
perfect weather
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unpleasant
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What to Wear in Seongnam in December
Cold weather calls for smart layering in December. A thermal base layer makes a huge difference in staying warm. Add a wool sweater or fleece, then a wind-resistant outer jacket. Pack a light rain jacket or compact umbrella for occasional showers. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Seongnam in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit South Korea, check out our Seongnam's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Seongnam climate overview or explore weather in South Korea.
