This report describes the typical weather at the Jeju International Airport (Jeju, South Korea) weather station over the course of an average October. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Jeju has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by oceans and seas (63%), croplands (21%), forests (10%), and shrublands (5%).
The month of October is characterized by falling daily high temperatures, with daily highs decreasing from 74°F to 65°F over the course of the month, exceeding 78°F or dropping below 59°F only one day in ten.
Over the course of October, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 60 minutes, implying an average day-over-day decrease of 1.9 minutes.
The shortest day of the month is October 31 with 10:51 hours of daylight; the longest day is October 1 with 11:51 hours of daylight.
The earliest sunrise is at 6:28am on October 1; the latest sunset is at 6:19pm on October 1; the latest sunrise is at 6:52am on October 31; the earliest sunset is at 5:43pm on October 31.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover is 76% (partly cloudy) and does not vary substantially over the course of the month.
On October 16, a representative day, the sky is clear or mostly clear 11% of the time, partly cloudy 12% of the time, and mostly cloudy or overcast 25% of the time.
The average probability that some form of precipitation will be observed in a given day is 43%, with little variation over the course of the month.
Throughout October, the most common forms of precipitation are moderate rain and light rain.
Moderate rain is the most severe precipitation observed during 55% of those days with precipitation. It is most likely around October 2, when it is observed during 25% of all days.
Light rain is the most severe precipitation observed during 38% of those days with precipitation. It is most likely around October 5, when it is observed during 17% of all days.
Either snow is exceptionally unlikely to fall at this location in October or this station does not reliably report precipitation types.
The relative humidity typically ranges from 58% (mildly humid) to 89% (very humid) over the course of a typical October, rarely dropping below 42% (comfortable) and reaching as high as 100% (very humid).
The air is driest around October 25, at which time the relative humidity drops below 67% (mildly humid) three days out of four; it is most humid around October 1, rising above 83% (humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a typical October, the dew point typically varies from 45°F (dry) to 64°F (mildy humid) and is rarely below 35°F (dry) or above 71°F (very muggy).
The time of the month between October 1 and October 31 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of October typical wind speeds vary from 2 mph to 15 mph (light air to moderate breeze), rarely exceeding 24 mph (strong breeze).
The highest average wind speed of 9 mph (gentle breeze) occurs around October 31, at which time the average daily maximum wind speed is 15 mph (moderate breeze).
The lowest average wind speed of 9 mph (gentle breeze) occurs around October 8, at which time the average daily maximum wind speed is 14 mph (moderate breeze).