Cool
Average highs are around 9°C, so pack for cooler days.
December verdict
Ulsan, South Korea in December
Weather score37Poor
Poor for holiday weather
Average highs are around 9°C, so pack for cooler days. Sunshine averages 6.2h per day, enough for a balanced month. Rainfall averages 21mm, which is relatively low for holiday planning.
December weather
Monthly averages
Temp
9°C
Rain
21mm
Sun
6.2h
Sea
17°C
Weather score
37
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 21mm, which is relatively low for holiday planning.
Some sun
Sunshine averages 6.2h per day, enough for a balanced month.
Cool sea
Sea temperatures average 17°C, so the water can feel cool.
Map
Weather map
Compare Ulsan, South Korea with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
December9°C average high
December is on the cooler side of Ulsan's year, useful if you prefer less intense daytime heat.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
December21mm average rain
December is one of Ulsan's driest months, making outdoor days easier to plan than in wetter parts of the year.
Driest monthsJanuary to March and October to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
December6.2 hours average sun
December is below Ulsan's yearly sunshine average, so bright-day planning is less reliable than in peak months.
Brightest monthsApril to May
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
December17°C average sea
December is below Ulsan's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaAugust to September
Sea temperatures are usually near 26°C in this stretch, so swimming comfort is at its strongest.
Weather score
December37 weather score
December scores below Ulsan's yearly average, so the weather trade-offs are more noticeable.
Best weather monthsJune to September
These months have the strongest weather score in the monthly averages.
