Average Weather in Kosan North Korea
In Kosan, 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 12°F to 85°F and is rarely below 0°F or above 91°F.
Based on the tourism score, the best times of year to visit Kosan for warm-weather activities are from early June to mid July and from late July to mid September.
The warm season lasts for 4.1 months, from May 19 to September 23, with an average daily high temperature above 74°F. The hottest day of the year is August 4, with an average high of 85°F and low of 69°F.
The cold season lasts for 2.9 months, from November 30 to February 26, with an average daily high temperature below 43°F. The coldest day of the year is January 18, with an average low of 12°F and high of 33°F.
Average High and Low Temperature
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
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
In Kosan, 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 in Kosan begins around September 12 and lasts for 6.4 months, ending around March 25. On December 27, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 73% of the time, and overcast or mostly cloudy 27% of the time.
The cloudier part of the year begins around March 25 and lasts for 5.6 months, ending around September 12. On July 16, the cloudiest day of the year, the sky is overcast or mostly cloudy 53% of the time, and clear, mostly clear, or partly cloudy 47% of the time.
Cloud Cover Categories
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Kosan varies significantly throughout the year.
The wetter season lasts 3.0 months, from June 15 to September 16, with a greater than 30% chance of a given day being a wet day. The chance of a wet day peaks at 53% on July 25.
The drier season lasts 9.0 months, from September 16 to June 15. The smallest chance of a wet day is 7% on January 25.
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 in Kosan changes throughout the year.
Rain alone is the most common for 10 months, from February 8 to December 19. The highest chance of a day with rain alone is 53% on July 25.
Mixed snow and rain is the most common for 1.7 months, from December 19 to February 8. The highest chance of a day with mixed snow and rain is 4% on January 8.
Daily Chance of Precipitation
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. Kosan experiences extreme seasonal variation in monthly rainfall.
The rainy period of the year lasts for 10 months, from February 10 to December 20, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around July 25, with an average total accumulation of 10.9 inches.
The rainless period of the year lasts for 1.7 months, from December 20 to February 10. The least rain falls around January 18, with an average total accumulation of 0.2 inches.
Average Monthly Rainfall
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Kosan experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 2.8 months, from November 30 to February 23, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 1, with an average total liquid-equivalent accumulation of 0.3 inches.
The snowless period of the year lasts for 9.2 months, from February 23 to November 30. The least snow falls around July 17, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Kosan varies significantly over the course of the year. In 2018, the shortest day is December 22, with 9 hours, 27 minutes of daylight; the longest day is June 21, with 14 hours, 54 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 4:34 AM on June 14, and the latest sunrise is 2 hours, 45 minutes later at 7:19 AM on January 5. The earliest sunset is at 4:38 PM on December 8, and the latest sunset is 2 hours, 51 minutes later at 7:29 PM on June 28.
Daylight saving time (DST) is not observed in Kosan during 2018.
Sunrise & Sunset with Twilight
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.
Kosan 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 4, with muggy conditions 90% of the time.
The least muggy day of the year is December 6, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 Kosan experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 6.6 months, from October 25 to May 13, with average wind speeds of more than 7.5 miles per hour. The windiest day of the year is January 16, with an average hourly wind speed of 9.4 miles per hour.
The calmer time of year lasts for 5.4 months, from May 13 to October 25. The calmest day of the year is June 21, with an average hourly wind speed of 5.5 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Kosan varies throughout the year.
The wind is most often from the east for 1.3 weeks, from June 29 to July 8 and for 1.5 months, from August 2 to September 17, with a peak percentage of 47% on August 31. The wind is most often from the west for 3.6 weeks, from July 8 to August 2 and for 9.4 months, from September 17 to June 29, with a peak percentage of 39% on July 16.
Kosan 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 2.9 months, from July 2 to September 30, with an average temperature above 68°F. The day of the year with the warmest water is August 13, with an average temperature of 75°F.
The time of year with cooler water lasts for 3.8 months, from December 22 to April 16, with an average temperature below 46°F. The day of the year with the coolest water is February 19, with an average temperature of 39°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Kosan 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 Kosan for general outdoor tourist activities are from early June to mid July and from late July to mid September, with a peak score in the third week of June.
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 Kosan for hot-weather activities is from mid July to mid August, with a peak score in the first week of August.
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.
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 Kosan typically lasts for 6.2 months (189 days), from around April 16 to around October 22, rarely starting before April 2 or after May 1, and rarely ending before October 8 or after November 6.
Time Spent in Various Temperature Bands and the Growing Season
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
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 in Kosan should appear around April 16, only rarely appearing before April 7 or after April 25.
Growing Degree Days
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 3.1 months, from April 19 to July 23, 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 3.0 months, from November 2 to February 3, with an average daily incident shortwave energy per square meter below 3.2 kWh. The darkest day of the year is December 20, with an average of 2.3 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Kosan are 38.856 deg latitude, 127.418 deg longitude, and 728 ft elevation.
The topography within 2 miles of Kosan contains very significant variations in elevation, with a maximum elevation change of 1,056 feet and an average elevation above sea level of 710 feet. Within 10 miles contains very significant variations in elevation (4,895 feet). Within 50 miles also contains extreme variations in elevation (5,400 feet).
The area within 2 miles of Kosan is covered by sparse vegetation (60%) and cropland (31%), within 10 miles by trees (58%) and sparse vegetation (18%), and within 50 miles by trees (43%) and water (22%).
This report illustrates the typical weather in Kosan, 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
There is only a single weather station, Hoengsong Ab, in our network suitable to be used as a proxy for the historical temperature and dew point records of Kosan.
At a distance of 84 kilometers from Kosan, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.
The station records are corrected for the elevation difference between the station and Kosan according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports 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.
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.