Weather in December
Temperature
As December arrives, Incheon's weather displays a decrease in high-temperatures, transitioning from November's cool 11.8°C (53.2°F) to a cold 4.7°C (40.5°F). Throughout the month of December, Incheon expects an average low of -2.6°C (27.3°F).Humidity
In Incheon, the average relative humidity in December is 62%.Rainfall
The month with the least rainfall is December, when the rain falls for 7.3 days and typically collects 19mm (0.75") of precipitation.Sea temperature
In Incheon, the average seawater temperature in December is 8.8°C (47.8°F).Note: Dipping into 8.8°C (47.8°F) below 10°C (50°F) needs protective wear, or you'd face cold shock and breathing issues swiftly. Meanwhile, a slight swim around 13°C (55.4°F) feels cold to the bone.
Daylight
With an average of 9h and 36min of daylight, December has the shortest days of the year.On the first day of December in Incheon, South Korea, sunrise is at 07:29 and sunset at 17:15. On the last day of the month, sunrise is at 07:47 and sunset at 17:25 KST.
Sunshine
In December, the average sunshine is 5.5h.Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
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Average temperature in December
Incheon, South Korea
- Average high temperature in December: 4.7°C
The warmest month (with the highest average high temperature) is August (29°C).
The month with the lowest average high temperature is January (1.7°C).
- Average low temperature in December: -2.6°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 (-5.4°C).
Average humidity in December
Incheon, South Korea
- Average humidity in December: 62%
The month with the highest relative humidity is July (82.2%).
The month with the lowest relative humidity is January (61.5%).
Average rainfall in December
Incheon, South Korea
- Average rainfall in December: 19.3mm
The wettest month (with the highest rainfall) is July (319.6mm).
The driest month (with the least rainfall) is December (19.3mm).
Average rainfall days in December
Incheon, South Korea
- Average rainfall days in December: 7.3 days
The month with the highest number of rainy days is July (14.9 days).
The month with the least rainy days is February (5.3 days).
Average sea temperature in December
Incheon, South Korea
- Average sea temperature in December: 8.8°C
The best month for swimming (with the highest average sea temperature) is August (23.4°C).
The coldest month (with the lowest average sea temperature) is February (3.3°C).
Average daylight in December /
Average sunshine in December
Incheon, South Korea
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 5h and 3min
The month with the most sunshine is May (Average sunshine: 7h and 30min).
The month with the least sunshine is July (Average sunshine: 5h and 6min).
Incheon, South Korea
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