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Climate and Average Weather Year Round at Seoul Air Base South Korea

At Seoul Air Base, the summers are long, warm, muggy, wet, and partly cloudy and the winters are short, freezing, dry, and mostly clear. Over the course of the year, the temperature typically varies from 17°F to 86°F and is rarely below 5°F or above 93°F.

Based on the tourism score, the best times of year to visit Seoul Air Base for warm-weather activities are from late May to early July and from mid August to late September.

Climate at Seoul Air Base

very coldcoldcoolwarmhotwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow71%71%45%45%clearovercastprecipitation: 11.5 inprecipitation: 11.5 in0.6 in0.6 inmuggy: 93%muggy: 93%0%0%drydrytourism score: 6.6tourism score: 6.60.00.0
Seoul Air Base weather by month. Click on each chart for more information.

Average Temperature at Seoul Air Base

The hot season lasts for 3.9 months, from May 25 to September 22, with an average daily high temperature above 76°F. The hottest day of the year is August 4, with an average high of 86°F and low of 72°F.

The cold season lasts for 3.0 months, from December 1 to February 28, with an average daily high temperature below 44°F. The coldest day of the year is January 18, with an average low of 17°F and high of 34°F.

Average High and Low Temperature at Seoul Air Base

Average High and Low Temperature at Seoul Air BasehotcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 1834°FJan 1834°FAug 486°FAug 486°F17°F17°F72°F72°FMay 2576°FMay 2576°FSep 2276°FSep 2276°FDec 144°FDec 144°FFeb 2844°FFeb 2844°F56°F56°F58°F58°F28°F28°F27°F27°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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

Average Hourly Temperature at Seoul Air Base

Average Hourly Temperature at Seoul Air BaseJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowfreezingfreezingfreezingvery coldcoldcoldcoolcoolcomfortablewarmvery coldhotfreezingwarm
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Princeton, Missouri, United States (6,480 miles away) is the far-away foreign place with temperatures most similar to Seoul Air Base (view comparison).

Compare Seoul Air Base to another city:

Clouds

At Seoul Air Base, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year at Seoul Air Base begins around September 11 and lasts for 5.9 months, ending around March 7. On October 20, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 71% of the time, and overcast or mostly cloudy 29% of the time.

The cloudier part of the year begins around March 7 and lasts for 6.1 months, ending around September 11. On July 14, the cloudiest day of the year, the sky is overcast or mostly cloudy 55% of the time, and clear, mostly clear, or partly cloudy 45% of the time.

Cloud Cover Categories at Seoul Air Base

Cloud Cover Categories at Seoul Air BaseclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 2071%Oct 2071%Jul 1445%Jul 1445%Sep 1158%Sep 1158%Mar 758%Mar 758%NowNowclearmostly clearpartly cloudyovercastmostly cloudy
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Seoul Air Base varies significantly throughout the year.

The wetter season lasts 2.8 months, from June 18 to September 11, with a greater than 31% chance of a given day being a wet day. The chance of a wet day peaks at 52% on July 22.

The drier season lasts 9.2 months, from September 11 to June 18. The smallest chance of a wet day is 9% on January 23.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 52% on July 22.

Daily Chance of Precipitation at Seoul Air Base

Daily Chance of Precipitation at Seoul Air BasewetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jul 2252%Jul 2252%Jan 239%Jan 239%Jan 19%Jan 19%Jun 1831%Jun 1831%Sep 1131%Sep 1131%NowNowrainsnow
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Seoul Air Base experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 11 months, from January 24 to December 29, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around July 17, with an average total accumulation of 11.5 inches.

The rainless period of the year lasts for 3.7 weeks, from December 29 to January 24. The least rain falls around January 13, with an average total accumulation of 0.5 inches.

Average Monthly Rainfall at Seoul Air Base

Average Monthly Rainfall at Seoul Air BaserainJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in5 in5 in10 in10 in15 in15 in20 in20 inJul 1711.5 inJul 1711.5 inJan 130.5 inJan 130.5 inDec 290.5 inDec 290.5 inNowNow
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Snowfall

The sliding 31-day liquid-equivalent quantity of snowfall at Seoul Air Base does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.

Average Liquid-Equivalent Monthly Snowfall at Seoul Air Base

Average Liquid-Equivalent Monthly Snowfall at Seoul Air BasesnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 inJan 150.1 inJan 150.1 inJul 170.0 inJul 170.0 inDec 180.1 inDec 180.1 inNowNow
The average liquid-equivalent snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.

Sun

The length of the day at Seoul Air Base varies significantly over the course of the year. In 2021, the shortest day is December 22, with 9 hours, 35 minutes of daylight; the longest day is June 21, with 14 hours, 45 minutes of daylight.

Hours of Daylight and Twilight at Seoul Air Base

Hours of Daylight and Twilight at Seoul Air BaseJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 2012 hr, 8 minMar 2014 hr, 45 minJun 2114 hr, 45 minJun 2112 hr, 10 minSep 2312 hr, 10 minSep 239 hr, 35 minDec 229 hr, 35 minDec 22nightnightdayNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:10 AM on June 13, and the latest sunrise is 2 hours, 36 minutes later at 7:46 AM on January 6. The earliest sunset is at 5:13 PM on December 6, and the latest sunset is 2 hours, 43 minutes later at 7:56 PM on June 28.

Daylight saving time (DST) is not observed at Seoul Air Base during 2021.

Sunrise & Sunset with Twilight at Seoul Air Base

Sunrise & Sunset with Twilight at Seoul Air BaseJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 135:10 AMJun 135:10 AM7:56 PMJun 287:56 PMJun 28Dec 65:13 PMDec 65:13 PM7:46 AMJan 67:46 AMJan 6daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2021. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Moon

The figure below presents a compact representation of key lunar data for 2021. 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.

Moon Rise, Set & Phases at Seoul Air Base

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

Humidity

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.

Seoul Air Base experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.0 months, from June 15 to September 16, during which time the comfort level is muggy, oppressive, or miserable at least 23% of the time. The muggiest day of the year is August 3, with muggy conditions 93% of the time.

The least muggy day of the year is December 6, when muggy conditions are essentially unheard of.

Humidity Comfort Levels at Seoul Air Base

Humidity Comfort Levels at Seoul Air BasemuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Dec 60%Dec 60%93%Aug 393%Aug 3Jun 1523%Jun 1523%Sep 1623%Sep 1623%NowNowoppressiveoppressivedrydrymuggymuggymiserablemiserablecomfortablecomfortable
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

Wind

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 at Seoul Air Base experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.7 months, from October 27 to May 18, with average wind speeds of more than 7.8 miles per hour. The windiest day of the year is February 24, with an average hourly wind speed of 9.1 miles per hour.

The calmer time of year lasts for 5.3 months, from May 18 to October 27. The calmest day of the year is June 14, with an average hourly wind speed of 6.5 miles per hour.

Average Wind Speed at Seoul Air Base

Average Wind Speed at Seoul Air BasewindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mphFeb 249.1 mphFeb 249.1 mphJun 146.5 mphJun 146.5 mphOct 277.8 mphOct 277.8 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction at Seoul Air Base varies throughout the year.

The wind is most often from the south for 4.1 weeks, from July 12 to August 10, with a peak percentage of 38% on July 22. The wind is most often from the east for 1.9 months, from August 10 to October 7, with a peak percentage of 38% on September 8. The wind is most often from the west for 9.2 months, from October 7 to July 12, with a peak percentage of 40% on January 1.

Wind Direction at Seoul Air Base

Wind Direction at Seoul Air BaseWSEWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Seoul Air Base 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 water temperature experiences significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.1 months, from July 6 to October 10, with an average temperature above 69°F. The day of the year with the warmest water is August 22, with an average temperature of 76°F.

The time of year with cooler water lasts for 3.7 months, from December 24 to April 16, with an average temperature below 47°F. The day of the year with the coolest water is February 19, with an average temperature of 39°F.

Average Water Temperature at Seoul Air Base

Average Water Temperature at Seoul Air BasewarmcoolJanFebMarAprMayJunJulAugSepOctNovDec30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°FAug 2276°FAug 2276°F39°FFeb 1939°FFeb 19Jul 669°FJul 669°FOct 1069°FOct 1069°FDec 2447°FDec 2447°FApr 1647°FApr 1647°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is at Seoul Air Base throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best times of year to visit Seoul Air Base for general outdoor tourist activities are from late May to early July and from mid August to late September, with a peak score in the third week of June.

Tourism Score at Seoul Air Base

Tourism Score at Seoul Air Basebest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.66.60.00.06.56.55.55.5NowNowprecipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Seoul Air Base for hot-weather activities is from mid July to late August, with a peak score in the first week of August.

Beach/Pool Score at Seoul Air Base

Beach/Pool Score at Seoul Air BaseJanFebMarAprMayJunJulAugSepOctNovDec002244668810105.85.80.00.0NowNowprecipitationprecipitationcloudscloudstemperaturetemperature beach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Growing 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 at Seoul Air Base typically lasts for 6.8 months (210 days), from around April 3 to around October 30, rarely starting before March 19 or after April 18, and rarely ending before October 15 or after November 14.

Time Spent in Various Temperature Bands and the Growing Season at Seoul Air Base

Time Spent in Various Temperature Bands and the Growing Season at Seoul Air Basegrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Apr 350%Apr 350%Oct 3050%Oct 3090%Apr 1890%Apr 1890%Oct 1590%Oct 1510%Mar 1910%Mar 1910%Nov 1410%Nov 140%Dec 170%Dec 17Jul 16100%Jul 16100%NowNowfrigidfreezingvery coldcoolcomfortablewarmhotcold
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing 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.

Based on growing degree days alone, the first spring blooms at Seoul Air Base should appear around April 12, only rarely appearing before April 4 or after April 22.

Growing Degree Days at Seoul Air Base

Growing Degree Days at Seoul Air BaseJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°F3,000°F3,000°F3,500°F3,500°F4,000°F4,000°FApr 1288°FApr 1288°FJun 14900°FJun 14900°FJul 211,800°FJul 211,800°FDec 313,733°FDec 313,733°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 experiences significant seasonal variation over the course of the year.

The brighter period of the year lasts for 3.6 months, from April 19 to August 5, with an average daily incident shortwave energy per square meter above 5.7 kWh. The brightest day of the year is June 1, with an average of 6.5 kWh.

The darker period of the year lasts for 2.9 months, from November 6 to February 3, with an average daily incident shortwave energy per square meter below 3.1 kWh. The darkest day of the year is December 20, with an average of 2.3 kWh.

Average Daily Incident Shortwave Solar Energy at Seoul Air Base

Average Daily Incident Shortwave Solar Energy at Seoul Air BasebrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJun 16.5 kWhJun 16.5 kWhDec 202.3 kWhDec 202.3 kWhApr 195.7 kWhApr 195.7 kWhAug 55.7 kWhAug 55.7 kWhNov 63.1 kWhNov 63.1 kWhFeb 33.1 kWhFeb 33.1 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Seoul Air Base are 37.447 deg latitude, 127.113 deg longitude, and 72 ft elevation.

The topography within 2 miles of Seoul Air Base contains very significant variations in elevation, with a maximum elevation change of 1,056 feet and an average elevation above sea level of 202 feet. Within 10 miles contains very significant variations in elevation (2,149 feet). Within 50 miles contains large variations in elevation (5,079 feet).

The area within 2 miles of Seoul Air Base is covered by trees (39%), sparse vegetation (33%), and grassland (22%), within 10 miles by trees (40%) and sparse vegetation (16%), and within 50 miles by trees (37%) and cropland (19%).

Data Sources

This report illustrates the typical weather at Seoul Air Base, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

Seoul Air Base has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back include but are not limited to Seoul, Suwon Ab, Camp Stanley / H-207, Tonghae Radar Site, Gimpo International Airport, Osan Ab, Pyongtaek Ab, and Incheon International Airport.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.