December Weather in Shouyan ChinaDaily high temperatures decrease by 8°F, from 60°F to 52°F, rarely falling below 38°F or exceeding 71°F. Daily low temperatures decrease by 6°F, from 45°F to 39°F, rarely falling below 30°F or exceeding 53°F. For reference, on July 24, the hottest day of the year, temperatures in Shouyan typically range from 78°F to 93°F, while on January 20, the coldest day of the year, they range from 38°F to 49°F. The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. 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. Aşağı Karafakılı, Turkey (4,393 miles away) and Āmol, Iran (3,532 miles) are the far-away foreign places with temperatures most similar to Shouyan (view comparison). CloudsThe month of December in Shouyan experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 31% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 29% on December 6. The clearest day of the month is December 6, with clear, mostly clear, or partly cloudy conditions 71% of the time. For reference, on July 8, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 78%, while on December 6, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 71%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Shouyan, the chance of a wet day over the course of December is essentially constant, remaining around 15% throughout. For reference, the year's highest daily chance of a wet day is 52% on June 8, and its lowest chance is 13% on December 17. Over the course of December in Shouyan, the chance of a day with only rain remains an essentially constant 13% throughout, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 1% throughout. RainfallTo 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 December in Shouyan is gradually decreasing, starting the month at 1.6 inches, when it rarely exceeds 4.2 inches or falls below 0.2 inches, and ending the month at 1.4 inches, when it rarely exceeds 3.0 inches or falls below 0.1 inches. The lowest average 31-day accumulation is 1.3 inches on December 19. SnowfallAs with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day. The average sliding 31-day snowfall during December in Shouyan is increasing, starting the month at 0.2 inches, when it rarely exceeds 0.4 inches or falls below -0.0 inches, and ending the month at 1.4 inches, when it rarely exceeds 4.3 inches or falls below -0.0 inches. SunOver the course of December in Shouyan, the length of the day is essentially constant. The shortest day of the month is December 21, with 10 hours, 33 minutes of daylight and the longest day is December 1, with 10 hours, 40 minutes of daylight. The earliest sunrise of the month in Shouyan is 7:03 AM on December 1 and the latest sunrise is 17 minutes later at 7:19 AM on December 31. The earliest sunset is 5:42 PM on December 1 and the latest sunset is 11 minutes later at 5:54 PM on December 31. Daylight saving time is not observed in Shouyan during 2024. For reference, on June 20, the longest day of the year, the Sun rises at 5:43 AM and sets 13 hours, 44 minutes later, at 7:27 PM, while on December 21, the shortest day of the year, it rises at 7:15 AM and sets 10 hours, 33 minutes later, at 5:48 PM. The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation. MoonThe figure below presents a compact representation of key lunar data for December 2024. 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
HumidityWe 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 Shouyan is essentially constant during December, remaining around 0% throughout. For reference, on July 9, the muggiest day of the year, there are muggy conditions 99% of the time, while on January 19, the least muggy day of the year, there are muggy conditions 0% of the time. WindThis 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 Shouyan is essentially constant during December, remaining within 0.1 miles per hour of 7.6 miles per hour throughout. For reference, on March 9, the windiest day of the year, the daily average wind speed is 8.8 miles per hour, while on August 11, the calmest day of the year, the daily average wind speed is 6.1 miles per hour. The hourly average wind direction in Shouyan throughout December is predominantly from the north, with a peak proportion of 72% on December 5. Growing SeasonDefinitions 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 Shouyan typically lasts for 10 months (305 days), from around February 20 to around December 21, rarely starting before January 19 or after March 15, and rarely ending before November 26 or after January 14. The month of December in Shouyan is very likely fully outside of the growing season, with the chance that a given day is in the growing season very rapidly decreasing from 85% to 26% over the course of the month. 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 Shouyan are gradually increasing during December, increasing by 86°F, from 6,041°F to 6,127°F, over the course of the month. Solar EnergyThis 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 Shouyan is essentially constant during December, remaining within 0.1 kWh of 3.4 kWh throughout. TopographyFor the purposes of this report, the geographical coordinates of Shouyan are 25.571 deg latitude, 111.502 deg longitude, and 686 ft elevation. The topography within 2 miles of Shouyan contains only modest variations in elevation, with a maximum elevation change of 354 feet and an average elevation above sea level of 671 feet. Within 10 miles contains only modest variations in elevation (5,295 feet). Within 50 miles also contains extreme variations in elevation (6,207 feet). The area within 2 miles of Shouyan is covered by cropland (48%) and trees (37%), within 10 miles by trees (56%) and cropland (29%), and within 50 miles by trees (63%) and cropland (17%). Data SourcesThis report illustrates the typical weather in Shouyan, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Temperature and Dew PointThere is only a single weather station, Guilin Liangjiang International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Shouyan. At a distance of 152 kilometers from Shouyan, 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 Shouyan to the nearest station, increasing from 0% at 150 kilometers to 100% at 200 kilometers. In this case, the MERRA-2 weight is 4%, making the weight assigned to the weather station 96%. Other DataAll 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 © OpenStreetMap contributors. DisclaimerThe 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. Please review our full terms contained on our Terms of Service page. |