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Average Weather in Changsu South Korea

In Changsu, the summers are warm, humid, wet, and mostly cloudy and the winters are freezing, dry, and partly cloudy. Over the course of the year, the temperature typically varies from 16°F to 82°F and is rarely below 6°F or above 88°F.

Based on the tourism score, the best time of year to visit Changsu for warm-weather activities is from early June to mid September.

Climate Summary

very coldcoldcoolwarmcoolcoldvery coldJanFebMarAprMayJunJulAugSepOctNovDec70%70%37%37%clearovercastprecipitation: 10.6 inprecipitation: 10.6 in0.7 in0.7 inmuggy: 89%muggy: 89%0%0%drydrytourism score: 6.2tourism score: 6.20.00.0
Click on each chart for more information.

Temperature

The warm season lasts for 3.8 months, from May 26 to September 20, with an average daily high temperature above 72°F. The hottest day of the year is August 3, with an average high of 82°F and low of 68°F.

The cold season lasts for 3.0 months, from December 1 to March 2, with an average daily high temperature below 42°F. The coldest day of the year is January 19, with an average low of 16°F and high of 32°F.

Average High and Low Temperature

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

Average Hourly Temperature in ChangsuJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMfreezingfreezingvery coldcoldcoldcoolcoolcomfortablewarmfreezingvery cold
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.

Northbrook, Illinois, United States (6,625 miles away) is the far-away foreign place with temperatures most similar to Changsu (view comparison).

Clouds

In Changsu, 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 Changsu begins around September 10 and lasts for 5.7 months, ending around March 1. On October 21, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 70% of the time, and overcast or mostly cloudy 30% of the time.

The cloudier part of the year begins around March 1 and lasts for 6.3 months, ending around September 10. On July 2, the cloudiest day of the year, the sky is overcast or mostly cloudy 63% of the time, and clear, mostly clear, or partly cloudy 37% of the time.

Cloud Cover Categories

Cloud Cover Categories in ChangsuclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 2170%Oct 2170%Jul 237%Jul 237%Sep 1053%Sep 1053%Mar 154%Mar 154%clearmostly clearovercastmostly cloudypartly 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 in Changsu varies significantly throughout the year.

The wetter season lasts 2.9 months, from June 15 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 9.

The drier season lasts 9.1 months, from September 11 to June 15. The smallest chance of a wet day is 9% on January 1.

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 Changsu changes throughout the year.

Rain alone is the most common for 11 months, from January 30 to December 22. The highest chance of a day with rain alone is 52% on July 9.

Snow alone is the most common for 1.3 months, from December 22 to January 30. The highest chance of a day with snow alone is 5% on January 10.

Daily Chance of Precipitation

Daily Chance of Precipitation in ChangsusnowrainJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jul 952%Jul 952%Jan 19%Jan 19%Dec 2210%Dec 2210%Jun 1531%Jun 1531%Sep 1131%Sep 1131%rainsnowmixed
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. Changsu experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 11 months, from January 20 to December 24, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around July 11, with an average total accumulation of 10.6 inches.

The rainless period of the year lasts for 3.8 weeks, from December 24 to January 20. The least rain falls around January 4, with an average total accumulation of 0.4 inches.

Average Monthly Rainfall

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

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. Changsu experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 4.1 months, from November 17 to March 21, 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 22, with an average total liquid-equivalent accumulation of 0.4 inches.

The snowless period of the year lasts for 7.9 months, from March 21 to November 17. The least snow falls around July 12, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall in ChangsusnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in2 in4 in6 in8 in10 inJan 220.4 inJan 220.4 inJul 120.0 inJul 120.0 inNov 170.1 inNov 170.1 inMar 210.1 inMar 210.1 in
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 in Changsu varies significantly over the course of the year. In 2018, the shortest day is December 22, with 9 hours, 45 minutes of daylight; the longest day is June 21, with 14 hours, 34 minutes of daylight.

Hours of Daylight and Twilight

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 5:13 AM on June 13, and the latest sunrise is 2 hours, 27 minutes later at 7:40 AM on January 7. The earliest sunset is at 5:16 PM on December 6, and the latest sunset is 2 hours, 33 minutes later at 7:49 PM on June 29.

Daylight saving time (DST) is not observed in Changsu during 2018.

Sunrise & Sunset with Twilight

Sunrise & Sunset with Twilight in ChangsuJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 135:13 AMJun 135:13 AM7:49 PMJun 297:49 PMJun 29Dec 65:16 PMDec 65:16 PM7:40 AMJan 77:40 AMJan 7daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2018. 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.

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.

Changsu experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 2.8 months, from June 19 to September 13, during which time the comfort level is muggy, oppressive, or miserable at least 22% of the time. The muggiest day of the year is August 3, with muggy conditions 89% of the time.

The least muggy day of the year is December 8, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels in ChangsumuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Dec 80%Dec 80%89%Aug 389%Aug 3Jun 1922%Jun 1922%Sep 1322%Sep 1322%oppressiveoppressivemuggymuggydrydry
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 in Changsu experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.0 months, from November 17 to May 19, with average wind speeds of more than 7.3 miles per hour. The windiest day of the year is February 22, with an average hourly wind speed of 8.5 miles per hour.

The calmer time of year lasts for 6.0 months, from May 19 to November 17. The calmest day of the year is September 19, with an average hourly wind speed of 6.2 miles per hour.

Average Wind Speed

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 in Changsu varies throughout the year.

The wind is most often from the west for 3.8 months, from March 6 to June 29, with a peak percentage of 39% on April 17. The wind is most often from the east for 1.9 months, from August 10 to October 8, with a peak percentage of 44% on September 15. The wind is most often from the north for 4.9 months, from October 8 to March 6, with a peak percentage of 51% on January 1.

Wind Direction

Wind Direction in ChangsuNWSENJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsoutheastnorth
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

Changsu 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 2.4 months, from July 14 to September 27, with an average temperature above 73°F. The day of the year with the warmest water is August 17, with an average temperature of 78°F.

The time of year with cooler water lasts for 4.2 months, from December 23 to April 29, with an average temperature below 57°F. The day of the year with the coolest water is February 25, with an average temperature of 52°F.

Average Water Temperature

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 in Changsu 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 time of year to visit Changsu for general outdoor tourist activities is from early June to mid September, with a peak score in the second week of August.

Tourism Score

Tourism Score in Changsubest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.26.20.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturetourism 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 Changsu for hot-weather activities is from late July to mid August, with a peak score in the first week of August.

Beach/Pool Score

Beach/Pool Score in ChangsuJanFebMarAprMayJunJulAugSepOctNovDec02468105.05.00.00.0precipitationprecipitationcloudscloudstemperaturetemperaturebeach/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 in Changsu typically lasts for 6.4 months (194 days), from around April 14 to around October 25, rarely starting before March 28 or after April 30, and rarely ending before October 9 or after November 10.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Changsugrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Apr 1450%Apr 1450%Oct 2550%Oct 2590%Apr 3090%Apr 3090%Oct 990%Oct 910%Mar 2810%Mar 2810%Nov 1010%Nov 100%Dec 150%Dec 15Jul 25100%Jul 25100%frigidfreezingvery coldcoolcomfortablewarmcold
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 in Changsu should appear around April 23, only rarely appearing before April 13 or after May 1.

Growing Degree Days

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 3.8 months, from April 16 to August 11, 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 10 to February 5, with an average daily incident shortwave energy per square meter below 3.2 kWh. The darkest day of the year is December 25, with an average of 2.4 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in ChangsubrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhJun 16.5 kWhJun 16.5 kWhDec 252.4 kWhDec 252.4 kWhApr 165.7 kWhApr 165.7 kWhAug 115.7 kWhAug 115.7 kWhFeb 53.2 kWhFeb 53.2 kWh
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 Changsu are 35.648 deg latitude, 127.515 deg longitude, and 1,880 ft elevation.

The topography within 2 miles of Changsu contains very significant variations in elevation, with a maximum elevation change of 1,722 feet and an average elevation above sea level of 1,698 feet. Within 10 miles contains very significant variations in elevation (3,698 feet). Within 50 miles also contains extreme variations in elevation (6,293 feet).

The area within 2 miles of Changsu is covered by sparse vegetation (41%), trees (26%), cropland (19%), and grassland (14%), within 10 miles by trees (54%) and grassland (23%), and within 50 miles by trees (49%) and grassland (17%).

Data Sources

This report illustrates the typical weather in Changsu, 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 are 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Changsu.

For each station, the records are corrected for the elevation difference between that station and Changsu according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Changsu is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Changsu and a given station.

The stations contributing to this reconstruction are: Taejon (24%, 73 kilometers, north); Sacheon Airport (21%, 81 kilometers, southeast); Gunsan Airport (19%, 86 kilometers, west); Kwangju Ab (19%, 87 kilometers, southwest); and Taegu (16%, 103 kilometers, east).

Other Data

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.

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.