December Weather in Rengang ChinaDaily high temperatures decrease by 8°F, from 55°F to 47°F, rarely falling below 38°F or exceeding 64°F. Daily low temperatures decrease by 6°F, from 38°F to 31°F, rarely falling below 23°F or exceeding 49°F. For reference, on July 27, the hottest day of the year, temperatures in Rengang typically range from 78°F to 92°F, while on January 13, the coldest day of the year, they range from 31°F to 45°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. Oklahoma City, United States (7,161 miles away) and Bay, United States (7,341 miles) are the far-away foreign places with temperatures most similar to Rengang (view comparison). CloudsThe month of December in Rengang 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 12. The clearest day of the month is December 12, with clear, mostly clear, or partly cloudy conditions 71% of the time. For reference, on July 4, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 73%, while on December 12, 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 Rengang, the chance of a wet day over the course of December is gradually decreasing, starting the month at 15% and ending it at 13%. For reference, the year's highest daily chance of a wet day is 48% on July 3, and its lowest chance is 11% on December 17. 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 Rengang is essentially constant, remaining about 1.1 inches throughout, and rarely exceeding 2.9 inches or falling below 0.1 inches. The lowest average 31-day accumulation is 1.0 inches on December 21. SunOver the course of December in Rengang, the length of the day is essentially constant. The shortest day of the month is December 21, with 10 hours, 3 minutes of daylight and the longest day is December 1, with 10 hours, 13 minutes of daylight. The earliest sunrise of the month in Rengang is 6:39 AM on December 1 and the latest sunrise is 18 minutes later at 6:57 AM on December 31. The earliest sunset is 4:51 PM on December 3 and the latest sunset is 11 minutes later at 5:02 PM on December 31. Daylight saving time is not observed in Rengang during 2024. For reference, on June 20, the longest day of the year, the Sun rises at 4:50 AM and sets 14 hours, 15 minutes later, at 7:05 PM, while on December 21, the shortest day of the year, it rises at 6:53 AM and sets 10 hours, 3 minutes later, at 4:56 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 Rengang is essentially constant during December, remaining around 0% throughout. The lowest chance of a muggy day during December is 0% on December 21. For reference, on July 23, the muggiest day of the year, there are muggy conditions 100% of the time, while on December 11, 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 Rengang is essentially constant during December, remaining within 0.1 miles per hour of 9.5 miles per hour throughout. For reference, on March 8, the windiest day of the year, the daily average wind speed is 10.2 miles per hour, while on October 22, the calmest day of the year, the daily average wind speed is 8.8 miles per hour. The hourly average wind direction in Rengang throughout December is predominantly from the north, with a peak proportion of 49% on December 25. Water TemperatureRengang 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 surface water temperature in Rengang is rapidly decreasing during December, falling by 9°F, from 58°F to 49°F, over the course of the month. 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 Rengang typically lasts for 8.3 months (256 days), from around March 12 to around November 23, rarely starting before February 23 or after April 1, and rarely ending before November 5 or after December 10. The month of December in Rengang is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season reaching a low of -0% on December 29. 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 Rengang are essentially constant during December, remaining within 14°F of 5,083°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 Rengang is essentially constant during December, remaining within 0.1 kWh of 2.9 kWh throughout. The lowest average daily incident shortwave solar energy during December is 2.8 kWh on December 28. TopographyFor the purposes of this report, the geographical coordinates of Rengang are 32.011 deg latitude, 120.835 deg longitude, and 16 ft elevation. The topography within 2 miles of Rengang contains only modest variations in elevation, with a maximum elevation change of 171 feet and an average elevation above sea level of 15 feet. Within 10 miles also contains only modest variations in elevation (390 feet). Within 50 miles contains only modest variations in elevation (1,276 feet). The area within 2 miles of Rengang is covered by artificial surfaces (65%) and water (33%), within 10 miles by cropland (48%) and water (35%), and within 50 miles by cropland (62%) and water (23%). Data SourcesThis report illustrates the typical weather in Rengang, 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, Shanghai Hongqiao International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Rengang. At a distance of 102 kilometers from Rengang, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records. The station records are corrected for the elevation difference between the station and Rengang according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations. Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis. 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. 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