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  5. May

Average Weather in May in Hedong China

Daily high temperatures increase by 5°F, from 80°F to 85°F, rarely falling below 70°F or exceeding 93°F.

Daily low temperatures increase by 6°F, from 58°F to 65°F, rarely falling below 50°F or exceeding 72°F.

For reference, on July 28, the hottest day of the year, temperatures in Hedong typically range from 73°F to 94°F, while on January 20, the coldest day of the year, they range from 35°F to 56°F.

Average High and Low Temperature in May

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 hourly average temperatures for the quarter of the year centered on May. 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.

Average Hourly Temperature in May

Average Hourly Temperature in May in Hedong18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM4 AM8 AM12 PM4 PM8 PM12 AMAprJuncoldcoolcoolcomfortablewarmhotcold
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.

Wilmer, Texas, United States (7,683 miles away) is the far-away foreign place with temperatures most similar to Hedong (view comparison).


The month of May in Hedong experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 63% to 68%.

The clearest day of the month is May 1, with clear, mostly clear, or partly cloudy conditions 37% of the time.

For reference, on July 1, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 78%, while on December 18, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 72%.

Cloud Cover Categories in May

Cloud Cover Categories in May in Hedong1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJunMay 137%May 137%May 3132%May 3132%May 1136%May 1136%May 2136%May 2136%clearmostly clearpartly cloudymostly cloudyovercast
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.


A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Hedong, the chance of a wet day over the course of May is essentially constant, remaining around 49% throughout.

For reference, the year's highest daily chance of a wet day is 54% on June 10, and its lowest chance is 13% on December 19.

Probability of Precipitation in May

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).


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

The average sliding 31-day rainfall during May in Hedong is rapidly increasing, starting the month at 8.5 inches, when it rarely exceeds 14.1 inches or falls below 4.5 inches, and ending the month at 10.4 inches, when it rarely exceeds 16.7 inches or falls below 5.4 inches.

Average Monthly Rainfall in May

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.


Over the course of May in Hedong, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 33 minutes, implying an average daily increase of 1 minute, 6 seconds, and weekly increase of 7 minutes, 42 seconds.

The shortest day of the month is May 1, with 13 hours, 12 minutes of daylight and the longest day is May 31, with 13 hours, 45 minutes of daylight.

Hours of Daylight and Twilight in May

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 latest sunrise of the month in Hedong is 5:26 AM on May 1 and the earliest sunrise is 16 minutes earlier at 5:10 AM on May 31.

The earliest sunset is 6:38 PM on May 1 and the latest sunset is 17 minutes later at 6:55 PM on May 31.

Daylight saving time is not observed in Hedong during 2019.

For reference, on June 21, the longest day of the year, the Sun rises at 5:09 AM and sets 13 hours, 53 minutes later, at 7:03 PM, while on December 22, the shortest day of the year, it rises at 6:51 AM and sets 10 hours, 24 minutes later, at 5:15 PM.

Sunrise & Sunset with Twilight in May

The solar day over the course of May. 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.


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 Hedong is very rapidly increasing during May, rising from 25% to 55% over the course of the month.

For reference, on July 25, the muggiest day of the year, there are muggy conditions 99% of the time, while on January 6, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in May

Humidity Comfort Levels in May in Hedong1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%10%20%30%40%50%60%70%80%90%100%AprJunMay 125%May 125%May 3155%May 3155%May 1134%May 1134%May 2143%May 2143%miserablemiserableoppressiveoppressivemuggymuggyhumidhumiddrydrycomfortablecomfortable
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.


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 Hedong is essentially constant during May, remaining within 0.2 miles per hour of 3.2 miles per hour throughout.

For reference, on March 10, the windiest day of the year, the daily average wind speed is 3.4 miles per hour, while on August 25, the calmest day of the year, the daily average wind speed is 2.9 miles per hour.

Average Wind Speed in May

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
The wind direction in Hedong during May is predominantly out of the south from May 1 to May 17 and the east from May 17 to May 31.

Wind Direction in May

Wind Direction in May in HedongESES1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%AprJunsoutheastnorthwest
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).

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 Hedong typically lasts for 8.5 months (260 days), from around March 12 to around November 27, rarely starting before February 20 or after March 31, and rarely ending before November 5 or after December 20.

The month of May in Hedong is reliably fully within the growing season.

Time Spent in Various Temperature Bands and the Growing Season in May

Time Spent in Various Temperature Bands and the Growing Season in May in Hedonggrowing seasongrowing seasongrowing season1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJun100%May 16100%May 16coldcoolcomfortablewarmhotvery coldsweltering
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.

The average accumulated growing degree days in Hedong are rapidly increasing during May, increasing by 623°F, from 801°F to 1,425°F, over the course of the month.

Growing Degree Days in May

The average growing degree days accumulated over the course of May, 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 in Hedong is essentially constant during May, remaining within 0.1 kWh of 5.3 kWh throughout.

Average Daily Incident Shortwave Solar Energy in May

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.


For the purposes of this report, the geographical coordinates of Hedong are 27.526 deg latitude, 118.791 deg longitude, and 958 ft elevation.

The topography within 2 miles of Hedong contains large variations in elevation, with a maximum elevation change of 2,215 feet and an average elevation above sea level of 931 feet. Within 10 miles contains large variations in elevation (3,993 feet). Within 50 miles also contains extreme variations in elevation (6,050 feet).

The area within 2 miles of Hedong is covered by trees (36%), cropland (36%), and artificial surfaces (17%), within 10 miles by trees (63%) and cropland (16%), and within 50 miles by trees (68%) and grassland (16%).

Data Sources

This report illustrates the typical weather in Hedong year round, 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, Mazu, in our network suitable to be used as a proxy for the historical temperature and dew point records of Hedong.

At a distance of 191 kilometers from Hedong, further than our threshold of 150 kilometers, this station is deemed insufficiently nearby to be relied upon as our primary source for temperature and dew point records. Consequently, the station records are blended with interpolated values from NASA's MERRA-2 satellite-era reanalysis , and both are corrected for elevation differences according to the International Standard Atmosphere .

The weight assigned to the MERRA-2 value depends on the distance from Hedong to the nearest station, increasing from 0% at 150 kilometers to 100% at 200 kilometers. In this case, the MERRA-2 weight is 45%, making the weight assigned to the weather station 55%.

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.


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.