Last updated: October 30, 2025
December in Seongsu, South Korea, presents a vibrant winter landscape with temperatures that range from a maximum of 17°C (63°F) to a minimum of -13°C (8°F), creating a diverse experience for visitors. The average temperature sits at a chilly 1°C (34°F), emphasizing the need for warm clothing. With 31 mm (1.2 in) of precipitation spread over 5 days, residents and travelers alike may encounter some damp weather; however, the humidity level at 73% adds a unique charm to this winter month. Enjoy the crisp air and festive atmosphere as you explore the region’s winter offerings!
In December, Seongsu, South Korea experiences a significant drop in temperatures as winter gains traction. The month opens with a brisk minimum temperature of -13°C (8°F), setting the stage for the chilly season ahead. On average, daytime highs reach about 1°C (34°F), while peaks can hit a moderate 17°C (63°F), creating a notable contrast between the cold mornings and relatively warmer afternoons. This month serves as a transition, bridging the previous autumn with the harsh winter ahead, as temperatures steadily decline from the milder conditions of November. The overall trend highlights a shift towards colder weather, characterized by a clear winter chill that prompts cozy gatherings and holiday festivities throughout the area.
In December, Seongsu, South Korea experiences a gentle drop in precipitation, with a total of 31 mm (1.2 in) spread over just 5 days. This marks a notable contrast from the heavy rainfalls seen during the summer months, particularly July and August, which often exceed 250 mm. The winter months generally bring a drier climate, with December following the trend established in November, where 42 mm of rain was recorded over 6 days. As the year closes, the reduced precipitation and fewer rainy days herald a transition into colder, drier winter conditions, making December a relatively calm month in the city's weather pattern.
As December rolls into Seongsu, South Korea, humidity levels settle at 73%, representing a gentle decline from the intense moisture of the preceding summer months. Following the peak of 95% in July and a sustained high throughout August, the atmosphere begins to cool, leading to a gradual decrease in humidity. This downward trend continues into autumn, with November recording 76% humidity. The moisture levels in December suggest a shift toward the crisper air of winter, yet still retain enough humidity to keep the chill from becoming too sharp. Overall, the transition reflects a typical seasonal pattern, providing a refreshing balance as the year draws to a close.
As the year draws to a close, December in Seongsu, South Korea, brings a moderate UV Index of 3, indicating that sun exposure remains relatively safe with a burn time of 30 minutes. This slight decline from the higher levels seen in the summer months reflects a consistent trend throughout the year, where UV intensity peaks in the warmer seasons. Notably, both June and July showcase extreme levels, reaching an intense UV Index of 12, while the spring and early fall months fluctuate between very high and high exposure categories. With the UV Index finally tapering off towards the end of the year, it's a reminder to stay vigilant about sun protection, even during cooler months. For more detailed information on UV levels throughout the year, check out Seongsu UV Index.
UV Risk Categories
December in Seongsu, South Korea, offers a gentle farewell to the year with 235 hours of sunlight, painting the landscape in a soft winter glow. As the days progress through the year, sunlight peaks in the vibrant months of May and April, showcasing a lush 304 and 283 hours respectively, while January starts off the year with a modest 192 hours. The trend indicates a steady increase in sunshine toward the middle of the year, with June maintaining a strong presence at 302 hours. Although December's sunlight dips slightly from November's 236 hours, it still provides a warm embrace, hinting at the lingering hopes of spring amidst the chilly air. This pattern not only highlights Seongsu's seasonal charm but also invites residents and visitors to bask in the fleeting brilliance of winter sunlight.
As December approaches in Seongsu, South Korea, residents can expect a 53% chance of sunny weather, reflecting a comforting consistency after the brisk chill of November, which boasts a 56% likelihood of bright days. This slight dip in sunshine is part of a trend that sees winter months generally offering lower sunshine probabilities than warmer seasons, peaking in October at 51%. While December may not be the sunniest month of the year, it still presents a fair opportunity for clear skies, making it a delightful time for enjoying the festive season amidst the beauty of winter's embrace.
As the year draws to a close in December, daylight in Seongsu, South Korea, diminishes to nine hours, marking the shortest days of the year. Following a gradual increase from ten hours in January and February to a peak of fourteen hours during the summer months of June, July, and August, the trend clearly reveals the seasonal shift in daylight. After basking in long, sunlit days, the transition back to shorter daylight hours begins in September, gradually decreasing through the fall months, culminating in a cozy, candle-lit December. This cyclical dance of daylight captures the essence of Seongsu's changing seasons, inviting residents to embrace the winter's charm despite the early sunsets.
As December ushers in the chill of winter in Seongsu, South Korea, the average wind speed stands at 2.7 m/s (or 6 mph), slightly higher than the calmer summer months of July and August, where winds barely reached 1.9 m/s. This modest increase from the year’s lowest wind speeds hints at a seasonal transition, with winter's presence becoming more palpable. Interestingly, December's winds are comparable to the spring months of April and May, which also recorded 2.8 m/s, suggesting a gentle yet persistent breeze that characterizes the city's winter atmosphere. Overall, December provides a refreshing reminder of the changing seasons, bridging the tranquility of fall with the briskness that winter forecasts.
Weather in Seongsu varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Seongsu, focusing on differences in temperature, rainfall, humidity, and UV levels.
In December, temperatures range from a minimum of -13°C (8°F) to a maximum of 17°C (63°F), with an average temperature of around 1°C (34°F). The month experiences 31 mm (1.2 in) of precipitation over about 5 days, accompanied by a humidity level of 73%. In contrast, January typically sees colder conditions, with minimum temperatures dropping to -19°C (-2°F) and an average of -1°C (31°F). The maximum temperature is slightly lower at 16°C (60°F), and precipitation is marginally less at 29 mm (1.1 in), also occurring over 5 days, but with a slightly lower humidity of 71%. For a more detailed look at January weather, you can visit Seongsu weather in January.
In December, temperatures range from a minimum of -13°C (8°F) to a maximum of 17°C (63°F), averaging around 1°C (34°F). The month experiences 31 mm (1.2 in) of precipitation over five days, with humidity levels at 73%. In contrast, February sees slightly colder lows of -14°C (7°F) and warmer highs peaking at 22°C (71°F), while maintaining the same average of 1°C (34°F). Precipitation increases to 39 mm (1.5 in) across five days, and humidity drops to 68%. For a detailed look at February weather, check Seongsu weather in February.
In December, temperatures typically range from a chilly -13°C (8°F) to a mild 17°C (63°F), with an average of around 1°C (34°F). The month experiences approximately 31 mm (1.2 in) of precipitation spread over five days, accompanied by a humidity level of 73%. In contrast, March sees warmer conditions, with temperatures fluctuating between -5°C (24°F) and a pleasant 23°C (74°F), averaging 7°C (45°F). Precipitation increases to 68 mm (2.7 in) over eight days, while humidity slightly decreases to 67%. For a more detailed look at March weather, you can check out Seongsu weather in March.
In December, the weather is generally much colder, with temperatures ranging from a frigid -13°C (8°F) to a mild 17°C (63°F), averaging around 1°C (34°F). Precipitation is relatively low, totaling 31 mm (1.2 in) over about 5 days, accompanied by a humidity level of 73%. In contrast, April brings a significant warmth, with temperatures varying from -2°C (29°F) to a warm 28°C (83°F), averaging 12°C (55°F). This month also experiences increased precipitation, with about 63 mm (2.5 in) over 7 days and a slightly higher humidity of 78%. For more insights, check out Seongsu weather in April.
December weather features a chilly range, with minimum temperatures dropping as low as -13°C (8°F) and an average hovering around 1°C (34°F). In contrast, May enjoys much warmer temperatures, with averages reaching 18°C (64°F) and highs of up to 30°C (86°F). While December sees limited precipitation of 31 mm (1.2 in) over about 5 days, May is noticeably wetter with 90 mm (3.5 in) falling across 9 days. The humidity levels also rise from 73% in December to 85% in May, contributing to a much different overall atmosphere. For a closer look at the pleasant conditions typical of May, check out Seongsu weather in May.
December and June present contrasting weather experiences. In December, temperatures can drop as low as -13°C (8°F), with an average of 1°C (34°F) and a maximum of 17°C (63°F), creating a chilly atmosphere. The month sees about 31 mm (1.2 in) of precipitation over five days, coupled with a humidity level of 73%. In stark contrast, June boasts a much milder temperature range, with a minimum of 10°C (51°F), an average of 22°C (71°F), and a maximum touching 33°C (91°F). This summer month experiences significantly higher precipitation, totaling 131 mm (5.2 in) over ten days, along with increased humidity at 87%. For a closer look at what to expect, check out Seongsu weather in June.
December and July present striking contrasts in weather. In December, temperatures range from a chilly -13°C (8°F) at night to a mild 17°C (63°F) during the day, with an average of around 1°C (34°F). The month sees limited precipitation, totaling 31 mm (1.2 in) over just five days, and a relatively high humidity of 73%. In contrast, July boasts a much warmer climate, with nighttime lows of 17°C (62°F) and daytime highs reaching up to 35°C (95°F), averaging 25°C (77°F). July is also characterized by significantly higher precipitation, with 261 mm (10.3 in) falling over 17 days, alongside an even higher humidity level of 95%. For a detailed look at the weather specifics, you can check out Seongsu weather in July.
December and August present stark contrasts in weather patterns. December, characterized by a chilly average temperature of 1°C (34°F), can dip to a minimum of -13°C (8°F), while maxing out at 17°C (63°F). The month sees relatively low precipitation, totaling 31 mm (1.2 in) over just 5 days, accompanied by a humidity level of 73%. In contrast, August is much warmer, with average temperatures around 26°C (79°F), peaking at 37°C (99°F) and only dropping to a minimum of 14°C (58°F). It experiences significantly higher rainfall, with 214 mm (8.4 in) falling over 17 days, and a notably higher humidity of 93%. For more details, you can check out Seongsu weather in August.
In comparing the weather of December and September, the differences are striking. December brings much colder temperatures, with a minimum of -13°C (8°F) and an average of just 1°C (34°F), while September enjoys milder conditions, including a minimum of 8°C (48°F) and an average of 21°C (70°F). Precipitation is significantly higher in September, totaling 201 mm (7.9 in) over 11 days, compared to December's much lighter 31 mm (1.2 in) across just 5 days. Furthermore, while September's humidity sits at 80%, December's relative humidity is slightly lower at 73%, adding to the chilly ambiance of the winter month. For a more detailed look at September's weather, you can visit Seongsu weather in September.
In comparing December and October weather, October generally exhibits milder temperatures, with averages around 14°C (58°F) and maximums reaching up to 30°C (86°F). In contrast, December experiences a significant drop in temperatures, averaging around 1°C (34°F) and with maximums only reaching 17°C (63°F). Precipitation is more pronounced in October, totaling 67 mm (2.6 in) over five days, compared to December's 31 mm (1.2 in), also over five days. Humidity is slightly higher in October at 78% versus 73% in December. For a closer look at the October climate, check out Seongsu weather in October.
In comparing the weather between November and December, December tends to be colder overall, with average temperatures dropping from 8°C (46°F) in November to around 1°C (34°F) in December. The minimum temperatures in December can plummet to -13°C (8°F), whereas November's minimum is notably warmer at -4°C (26°F). Precipitation levels slightly decrease in December, with 31 mm (1.2 in) over 5 days compared to 42 mm (1.6 in) across 6 days in November. Humidity remains relatively consistent, with November at 76% and December at 73%. For more detailed information, you can check Seongsu weather in November.
As December rolls into Seongsu, the weather presents a stark contrast to the mildness of previous months. With temperatures dipping significantly, residents experience a chilly atmosphere characterized by an average of 1°C and some days plummeting to a frigid -13°C. This month is relatively dry, with only about 31 mm of precipitation spread across five days, making it less rainy than many other times of the year. The humidity level rises to 73%, adding a brisk edge to the air. For those curious about how the colder months compare to the rest of the year, Seongsu Climate provides a comprehensive overview.