December Weather in Yamansu ChinaDaily high temperatures decrease by 6°F, from 42°F to 36°F, rarely falling below 29°F or exceeding 49°F. Daily low temperatures decrease by 6°F, from 26°F to 20°F, rarely falling below 13°F or exceeding 33°F. For reference, on July 25, the hottest day of the year, temperatures in Yamansu typically range from 63°F to 87°F, while on January 16, the coldest day of the year, they range from 18°F to 35°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. Centerville, Iowa, United States (6,764 miles away) is the far-away foreign place with temperatures most similar to Yamansu (view comparison). CloudsThe month of December in Yamansu experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 45% to 49%. The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 55% of the time. For reference, on March 23, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 62%, while on August 9, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 85%. PrecipitationSunOver the course of December in Yamansu, the length of the day is essentially constant. The shortest day of the month is December 21, with 9 hours, 12 minutes of daylight and the longest day is December 1, with 9 hours, 26 minutes of daylight. The earliest sunrise of the month in Yamansu is 9:49 AM on December 1 and the latest sunrise is 19 minutes later at 10:08 AM on December 31. The earliest sunset is 7:14 PM on December 7 and the latest sunset is 10 minutes later at 7:24 PM on December 31. Daylight saving time is not observed in Yamansu during 2024. For reference, on June 20, the longest day of the year, the Sun rises at 7:10 AM and sets 15 hours, 9 minutes later, at 10:19 PM, while on December 21, the shortest day of the year, it rises at 10:05 AM and sets 9 hours, 12 minutes later, at 7:18 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 Yamansu is essentially constant during December, remaining around 0% throughout. 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 Yamansu is essentially constant during December, remaining within 0.1 miles per hour of 3.5 miles per hour throughout. For reference, on May 6, the windiest day of the year, the daily average wind speed is 6.8 miles per hour, while on December 23, the calmest day of the year, the daily average wind speed is 3.3 miles per hour. The lowest daily average wind speed during December is 3.3 miles per hour on December 23. The hourly average wind direction in Yamansu throughout December is predominantly from the north, with a peak proportion of 37% on December 26. 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 Yamansu typically lasts for 7.3 months (222 days), from around March 27 to around November 5, rarely starting before March 8 or after April 17, and rarely ending before October 17 or after November 24. The month of December in Yamansu is very likely fully outside of the growing season, with the chance that a given day is in the growing season gradually decreasing from 4% to 0% 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 Yamansu are essentially constant during December, remaining around 3,269°F throughout. 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 Yamansu is essentially constant during December, remaining within 0.1 kWh of 2.4 kWh throughout. The lowest average daily incident shortwave solar energy during December is 2.3 kWh on December 21. TopographyFor the purposes of this report, the geographical coordinates of Yamansu are 41.149 deg latitude, 79.085 deg longitude, and 4,993 ft elevation. The topography within 2 miles of Yamansu contains very significant variations in elevation, with a maximum elevation change of 1,467 feet and an average elevation above sea level of 5,024 feet. Within 10 miles contains very significant variations in elevation (6,549 feet). Within 50 miles also contains extreme variations in elevation (13,845 feet). The area within 2 miles of Yamansu is covered by cropland (70%) and bare soil (12%), within 10 miles by bare soil (52%) and grassland (23%), and within 50 miles by bare soil (51%) and grassland (40%). Data SourcesThis report illustrates the typical weather in Yamansu, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Yamansu 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 Yamansu, 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 Algorithms 2nd Edition , 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 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. 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