Seoul vs Jeju

Based on sunshine hours, rain days, comfortable temperatures, and humidity levels, Seoul edges ahead as the better destination in December. Seoul offers 7 hours of daily sunshine with only 5 rain days, while Jeju sees 6 sunshine hours and 8 rain days.

Seoul is on the cooler side at 3°C, requiring warmer clothing. Jeju is cooler at 10°C.

For travelers who prioritize dry weather, Seoul is the stronger choice in December. Seoul receives 1 more hour of sunshine per day, which matters for sightseeing and outdoor activities.

Seoul reaches an average high of 3°C (37°F) and drops to -5°C (23°F) at night during December. The daily temperature range is 8°C, meaning moderate variation throughout the day.

Jeju averages 10°C (50°F) for the high and 6°C (43°F) for the low, with a daily range of 4°C. There is a notable 7°C gap between the two cities, so expect a very different feel.

Both cities are in the Northern Hemisphere, so they share the same seasonal pattern in December.

Seoul receives approximately 23 mm of rainfall across 5 rain days during December. Rain is occasional, so a light rain jacket should suffice.

Jeju sees 59 mm over 8 rain days. That makes Seoul the drier option by 3 rain days and 36 mm of total precipitation.

Humidity also differs: Seoul averages 65% while Jeju sits at 70%. Jeju will feel muggier, especially at higher temperatures.