Cool
Average highs are around 18°C, so pack for cooler days.
December verdict
Ulleungdo, South Korea in December
Weather score23Poor
Poor for holiday weather
Average highs are around 18°C, so pack for cooler days. Sunshine averages 0h per day, so this is not one of the brighter months. Rainfall averages 66mm, which is relatively low for holiday planning.
December weather
Monthly averages
Temp
18°C
Rain
66mm
Sun
0h
Sea
15°C
Weather score
23
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 66mm, which is relatively low for holiday planning.
Limited sun
Sunshine averages 0h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 15°C, so the water can feel cool.
Map
Weather map
Compare Ulleungdo, South Korea with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
December18°C average high
December is on the cooler side of Ulleungdo's year, useful if you prefer less intense daytime heat.
Warmest monthsJuly to September
This stretch sets the upper range for average daytime heat.
Rain
December66mm average rain
December is one of Ulleungdo's driest months, making outdoor days easier to plan than in wetter parts of the year.
Driest monthsJanuary to June and October to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
December0 hours average sun
December is close to Ulleungdo's usual sunshine level, with limited seasonal swing across the year.
Brightest monthsAll year
Sunshine stays consistently strong through the year.
Sea temperature
December15°C average sea
December is below Ulleungdo's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaJuly to September
Sea temperatures are usually near 22°C in this stretch, so swimming comfort is at its strongest.
Weather score
December23 weather score
December is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.
Best weather monthsJune to September
These months have the strongest weather score in the monthly averages.