Fall Weather in Wŏnju South Korea

Daily high temperatures decrease by 37°F, from 80°F to 43°F, rarely falling below 33°F or exceeding 86°F.

Daily low temperatures decrease by 39°F, from 65°F to 26°F, rarely falling below 16°F or exceeding 71°F.

For reference, on August 3, the hottest day of the year, temperatures in Wŏnju typically range from 71°F to 85°F, while on January 19, the coldest day of the year, they range from 15°F to 33°F.

The figure below shows you a compact characterization of the hourly average fall temperatures. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Lamoni, United States (6,440 miles away) is the far-away foreign place with temperatures most similar to Wŏnju (view comparison).

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The fall in Wŏnju experiences rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 47% to 35%. The lowest chance of overcast or mostly cloudy conditions is 31% on October 19.

The clearest day of the fall is October 19, with clear, mostly clear, or partly cloudy conditions 69% of the time.

For reference, on July 13, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 57%, while on October 19, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 69%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Wŏnju, the chance of a wet day over the course of the fall is very rapidly decreasing, starting the season at 41% and ending it at 15%.

For reference, the year's highest daily chance of a wet day is 53% on July 25, and its lowest chance is 9% on December 31.

Over the course of the fall in Wŏnju, the chance of a day with only rain decreases from 41% to 13%, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 0% throughout.

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the fall in Wŏnju is very rapidly decreasing, starting the season at 8.0 inches, when it rarely exceeds 15.5 inches or falls below 2.6 inches, and ending the season at 1.1 inches, when it rarely exceeds 2.4 inches or falls below 0.2 inches.

Over the course of the fall in Wŏnju, the length of the day is very rapidly decreasing. From the start to the end of the season, the length of the day decreases by 3 hours, 10 minutes, implying an average daily decrease of 2 minutes, 7 seconds, and weekly decrease of 14 minutes, 48 seconds.

The shortest day of the fall is November 30, with 9 hours, 48 minutes of daylight and the longest day is September 1, with 12 hours, 58 minutes of daylight.

The earliest sunrise of the fall in Wŏnju is 5:58 AM on September 1 and the latest sunrise is 1 hour, 24 minutes later at 7:22 AM on November 30.

The latest sunset is 6:57 PM on September 1 and the earliest sunset is 1 hour, 46 minutes earlier at 5:10 PM on November 30.

Daylight saving time is not observed in Wŏnju during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:07 AM and sets 14 hours, 44 minutes later, at 7:52 PM, while on December 21, the shortest day of the year, it rises at 7:38 AM and sets 9 hours, 35 minutes later, at 5:14 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for the fall of 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in Wŏnju is very rapidly decreasing during the fall, falling from 47% to 0% over the course of the season.

For reference, on August 2, the muggiest day of the year, there are muggy conditions 91% of the time, while on October 30, the least muggy day of the year, there are muggy conditions 0% of the time.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Wŏnju is gradually increasing during the fall, increasing from 6.6 miles per hour to 7.1 miles per hour over the course of the season.

For reference, on April 21, the windiest day of the year, the daily average wind speed is 8.3 miles per hour, while on September 20, the calmest day of the year, the daily average wind speed is 6.1 miles per hour.

The lowest daily average wind speed during the fall is 6.1 miles per hour on September 20.

The wind direction in Wŏnju during the fall is predominantly out of the east from September 1 to October 3 and the west from October 3 to November 30.

Wŏnju is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature in Wŏnju is very rapidly decreasing during the fall, falling by 20°F, from 75°F to 55°F, over the course of the season.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Wŏnju typically lasts for 6.7 months (204 days), from around April 5 to around October 27, rarely starting before March 21 or after April 20, and rarely ending before October 11 or after November 11.

During the fall in Wŏnju, the chance that a given day is within the growing season is very rapidly decreasing falling from 100% to -0% over the course of the season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Wŏnju are rapidly increasing during the fall, increasing by 734°F, from 2,855°F to 3,589°F, over the course of the season.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in Wŏnju is very rapidly decreasing during the fall, falling by 2.6 kWh, from 5.1 kWh to 2.5 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Wŏnju are 37.351 deg latitude, 127.945 deg longitude, and 436 ft elevation.

The topography within 2 miles of Wŏnju contains significant variations in elevation, with a maximum elevation change of 705 feet and an average elevation above sea level of 507 feet. Within 10 miles contains significant variations in elevation (3,947 feet). Within 50 miles also contains extreme variations in elevation (5,187 feet).

The area within 2 miles of Wŏnju is covered by sparse vegetation (72%), cropland (12%), and trees (11%), within 10 miles by trees (66%) and cropland (15%), and within 50 miles by trees (64%) and sparse vegetation (13%).