Jeju-do

Ara-dong, South Korea Climate

NASA POWER reanalysis for the half-degree grid cell around Ara-dong, 1991-2020; a grid cell is an area average and can differ from a thermometer in town by several degrees

The warmest month is August, with an average high of 27°C; the coldest is January, with an average low of 6°C. A normal year brings 1576 mm of precipitation.

Temperature through the year

The normal daily high and low. The line marks today.

Normal daily high and low temperature at Ara-dong through the year, in °C, with the record for each date.-10010203040JanFebMarAprMayJunJulAugSepOctNovDec
  • Normal low
  • Normal high
  • Reanalysis extreme high
  • Reanalysis extreme low

Normals for Sep 25

Normal high
23°C
Normal low
21°C
Reanalysis high
25°Cin 2008
Reanalysis low
20°Cin 1994
Chance of a wet day
29%
Daylight
12 h 03 min

Month by month

Averages for 1991-2020. Wet days have at least 1 mm of precipitation in the reanalysis. Each month links to its own page.

MonthAvg highAvg lowWarmestColdestPrecipitationWet days
January9°C6°C18°C (2020)-2°C (2016)56 mm9.3
February9°C6°C16°C (2009)0°C (1991)62 mm8.5
March11°C8°C17°C (2018)2°C (2015)99 mm9.3
April14°C12°C20°C (1998)5°C (1991)126 mm9.0
May18°C15°C23°C (2014)11°C (2000)140 mm9.3
June22°C19°C26°C (2005)15°C (2010)195 mm12.0
July25°C24°C30°C (1994)19°C (1996)239 mm15.5
August27°C26°C31°C (2013)21°C (1993)273 mm18.6
September24°C23°C29°C (1997)18°C (2008)180 mm9.0
October20°C18°C26°C (2019)10°C (2010)81 mm6.2
November16°C13°C22°C (2011)5°C (1992)72 mm9.0
December11°C8°C20°C (1997)2°C (2005)53 mm9.3
Year17°C15°C1576 mm125

Precipitation

Rain and melted snow together. The chance of a wet day is the share of days with at least 1 mm of precipitation in the reanalysis.

1576 mm in a normal year, most in August.

Chance of a wet day

The chance of at least 1 mm of precipitation in the reanalysis on each date at Ara-dong, in percent.020406080JanFebMarAprMayJunJulAugSepOctNovDec
  • Chance of a wet day

Humidity and comfort

NASA POWER reanalysis, 1991-2020, for the grid cell around Ara-dong.

The muggiest month is August, when 100 percent of days are muggy or worse, with a mean dew point of 18°C or more.

MonthDew pointHumidityDryComfortableHumidMuggyOppressiveMiserable
January4°C77%100%0%0%0%0%0%
February4°C75%99%1%0%0%0%0%
March5°C74%98%2%0%0%0%0%
April9°C79%81%18%2%0%0%0%
May14°C85%29%45%25%1%0%0%
June19°C89%0%7%39%40%13%0%
July23°C91%0%0%1%17%46%36%
August24°C85%0%0%0%10%33%57%
September20°C80%1%8%22%37%25%8%
October14°C74%33%34%23%8%2%0%
November10°C74%79%14%6%1%0%0%
December6°C76%98%1%0%0%0%0%

Comfort is judged by the day's mean dew point: dry below 13°C, comfortable to 16°C, humid to 18°C, muggy to 21°C, oppressive to 24°C, miserable above.

Clouds

Average share of the sky covered, from satellite (CERES and GEWEX SRB) by way of NASA POWER, 1991-2020.

The clearest month is October, with the sky 58 percent covered on average; the cloudiest is June, at 81 percent.

Wind

The mean wind speed over the whole day, from the MERRA-2 reanalysis by way of NASA POWER. Gusts run well above it.

The windiest month is January, averaging 27.4 km/h at 10 meters (33 feet) above the ground.

Daylight and sunshine

The longest day is Jun 19, with 14 h 23 min of daylight; the shortest is Dec 17, with 9 h 56 min.

Hours of daylight at Ara-dong through the year.0510152025JanFebMarAprMayJunJulAugSepOctNovDec
  • Day length

Solar energy

Average daily sunshine reaching the ground on a flat surface, in kilowatt-hours per square meter, clouds included.

Sunrise and sunset calendar

Month pages

The weather in Ara-dong in each month, day by day.

What this means

A normal is the average of the thirty years 1991 to 2020, the period the World Meteorological Organization and NOAA use for comparison. It is an average, not a forecast: most days depart from it, and some by a long way.

Where no station record is within reach, the extremes shown are the highest and lowest the reanalysis produced for the date in 1991-2020, not measured records.

Cloud, humidity, wind and sunshine come from a reanalysis: a weather model run over the past with every observation fed in, averaged over a grid cell about 50 km across. It is consistent everywhere on Earth; it smooths local detail such as a lake shore or a valley.

More for this place

Nearby

Sources

Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.