Average Weather in May in Hekou China
Daily high temperatures increase by 6°F, from 79°F to 86°F, rarely falling below 69°F or exceeding 93°F.
Daily low temperatures increase by 7°F, from 61°F to 68°F, rarely falling below 53°F or exceeding 73°F.
For reference, on July 30, the hottest day of the year, temperatures in Hekou typically range from 77°F to 93°F, while on January 19, the coldest day of the year, they range from 33°F to 50°F.
Average High and Low Temperature in May
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
The month of May in Hekou experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 49% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 47% on May 20.
The clearest day of the month is May 20, with clear, mostly clear, or partly cloudy conditions 53% of the time.
For reference, on July 6, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 70%, while on December 17, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 73%.
Cloud Cover Categories in May
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Hekou, the chance of a wet day over the course of May is gradually decreasing, starting the month at 38% and ending it at 35%.
For reference, the year's highest daily chance of a wet day is 41% on July 6, and its lowest chance is 10% on December 18.
Probability of Precipitation in May
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 Hekou is increasing, starting the month at 5.2 inches, when it rarely exceeds 7.5 inches or falls below 2.6 inches, and ending the month at 5.9 inches, when it rarely exceeds 9.2 inches or falls below 3.1 inches.
Average Monthly Rainfall in May
Over the course of May in Hekou, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 36 minutes, implying an average daily increase of 1 minute, 12 seconds, and weekly increase of 8 minutes, 24 seconds.
The shortest day of the month is May 1, with 13 hours, 18 minutes of daylight and the longest day is May 31, with 13 hours, 54 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Hekou is 5:51 AM on May 1 and the earliest sunrise is 18 minutes earlier at 5:34 AM on May 31.
The earliest sunset is 7:10 PM on May 1 and the latest sunset is 18 minutes later at 7:28 PM on May 31.
Daylight saving time is not observed in Hekou during 2018.
For reference, on June 21, the longest day of the year, the Sun rises at 5:33 AM and sets 14 hours, 3 minutes later, at 7:36 PM, while on December 21, the shortest day of the year, it rises at 7:24 AM and sets 10 hours, 15 minutes later, at 5:38 PM.
Sunrise & Sunset with Twilight in May
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 Hekou is very rapidly increasing during May, rising from 21% to 54% over the course of the month.
For reference, on July 20, the muggiest day of the year, there are muggy conditions 99% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in May
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 Hekou is decreasing during May, decreasing from 7.5 miles per hour to 6.5 miles per hour over the course of the month.
For reference, on March 9, the windiest day of the year, the daily average wind speed is 7.7 miles per hour, while on June 11, the calmest day of the year, the daily average wind speed is 6.4 miles per hour.
The highest daily average wind speed during May is 7.5 miles per hour on May 1.
Average Wind Speed in May
Wind Direction in May
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 Hekou typically lasts for 9.4 months (284 days), from around February 26 to around December 7, rarely starting before February 4 or after March 18, and rarely ending before November 18 or after December 26.
The month of May in Hekou is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in May
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 Hekou are rapidly increasing during May, increasing by 676°F, from 693°F to 1,369°F, over the course of the month.
Growing Degree Days in May
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 Hekou is essentially constant during May, remaining within 0.2 kWh of 5.5 kWh throughout.
Average Daily Incident Shortwave Solar Energy in May
For the purposes of this report, the geographical coordinates of Hekou are 29.629 deg latitude, 111.580 deg longitude, and 157 ft elevation.
The topography within 2 miles of Hekou contains significant variations in elevation, with a maximum elevation change of 807 feet and an average elevation above sea level of 171 feet. Within 10 miles contains significant variations in elevation (1,371 feet). Within 50 miles contains very significant variations in elevation (4,852 feet).
The area within 2 miles of Hekou is covered by cropland (59%), water (15%), and artificial surfaces (10%), within 10 miles by cropland (48%) and trees (32%), and within 50 miles by trees (40%) and cropland (39%).
This report illustrates the typical weather in Hekou year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Hekou is further than 200 kilometers from the nearest reliable weather station, so the weather-related data on this page were taken entirely from NASA's MERRA-2 satellite-era reanalysis . 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.
The temperature and dew point estimates are corrected for the difference between the reference elevation of the MERRA-2 grid cell and the elevation of Hekou, according to the International Standard Atmosphere .
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.
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.