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Climate - Ulleungdo (South Korea)


Average weather, temperature, rainfall, sunshine hours

Flag - South Korea

Ulleung, where it's located


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Climate chart - Ulleungdo
In Ulleung-do, an island located in the East Sea (or Sea of Japan), about 130 km (80 mi) east of the Korean coast, the climate is temperate humid, with cold, damp winters and warm, sultry summers. There is no dry season.
The island has no airport, so it can only be reached by ferry.
In winter, cold winds coming from the Asian continent pick up moisture when passing over the sea, so the island is subject to frequent falls of rain and snow. There can be very cold periods, with highs around freezing (0 °C or 32 °F) and lows dropping to -6/-8 °C (18/21 °F), but also relatively mild periods, with highs around 10/12 °C (50/54 °F), more likely in December. The coldest record is -13.6 °C (7.5 °F) and was set in February 1981.
Wind and humidity exacerbate the feeling of cold.
In the interior of the island, there is a small mountain, Seonginbong, 984 meters (3,228 feet) high, where snowfalls in winter are even more copious.
In summer, there are periods of good weather, hot and muggy, with highs around 30/32 °C (86/90 °F), though tempered by the breeze, but also periods of bad weather, with wind and rain. Sometimes, especially in June and in the first half of July, temperatures can be bit cool. The highest record is 35.4 °C (95.7 °F) and was set in August 2013.
Here are the average temperatures. The weather station is at 220 meters (720 feet), so we can expect a temperature roughly 1.5 degrees Celsius (2.7 °F) higher on the coast.
Ulleungdo - Average temperatures (1991-2020)
MonthMin (°C)Max (°C)Mean (°C)Min (°F)Max (°F)Mean (°F)
January052.2314036
February062.9324237.3
March3106.4385043.6
April81511.5465952.7
May132016.2556761.1
June162219.5627267.1
July202623697873.5
August222724.4718075.8
September182320.5647469
October131916556660.7
November81310.4465650.8
December274.8364540.6
Year10.316.113.250.561.155.5

Precipitation is fairly abundant, in fact, it reaches 1,400 millimeters (55 inches) per year. The wettest period is from July to September because of the summer monsoon, but winter is the season in which precipitation is more frequent. Here is the average precipitation.
Ulleungdo - Average precipitation
MonthMillimetersInchesDays
January1154.519
February803.115
March702.812
April803.18
May1054.19
June1154.59
July1706.712
August1706.712
September1706.710
October853.39
November1054.112
December1154.517
Year138554.5143

The amount of sunshine in Ulleung-do is scarce in winter, when the skies are usually cloudy; in the other seasons, it is not very good, however, the sun shines half the time during the months of April, May and October, while in summer, the amount of sunshine decreases again because of the summer monsoon. Here are the average sunshine hours per day.
Ulleungdo - Sunshine hours
MonthAverageTotal
January390
February3.5105
March5.5165
April7210
May7.5225
June6175
July5150
August5.5165
September5.5160
October5.5175
November4.5130
December3100
Year5.11855

The sea in Ulleung-do becomes warm enough for swimming in August, while it is a bit cool in July and September. Here are the average sea temperatures.
Ulleungdo - Sea temperature
MonthCelsius (°C)Fahrenheit (°F)
January11.553
February9.549
March9.549
April12.554
May15.560
June19.567
July22.572
August2476
September2272
October19.567
November16.561
December12.554
Year16.361.3

About 90 km (55 mi) east-southeast of the island, and visible from the east coast or from the highlands of the interior, we find Dokdo (aka Liancourt Rocks or Takeshima in Japanese). They are small islands, and have a similar climate, just slightly milder and less rainy: the average annual precipitation is around 1,250 mm (49 in). 2016.

Ulleungdo

From July to early October (and occasionally also in the second half of June), Ulleung-do can be affected by typhoons, the tropical cyclones of Southeast Asia, which bring strong winds and heavy rains.

Best Time



The best times to visit Ulleung Island are spring and autumn, and in particular from early May to mid-June and from mid-October to mid-November. In April it can still be cold. In summer it is generally not too hot, moreover, temperatures are milder on the hills, but the rains are abundant and typhoons can pass.


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