Winter Weather in Xiwulan Bulang ChinaDaily high temperatures increase by 6°F, from 22°F to 27°F, rarely falling below 1°F or exceeding 40°F. The lowest daily average high temperature is 13°F on January 11. Daily low temperatures increase by 4°F, from 4°F to 7°F, rarely falling below -17°F or exceeding 19°F. The lowest daily average low temperature is -6°F on January 14. For reference, on July 14, the hottest day of the year, temperatures in Xiwulan Bulang typically range from 56°F to 74°F, while on January 13, the coldest day of the year, they range from -6°F to 13°F. The figure below shows you a compact characterization of the hourly average winter temperatures. 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. Cold Lake, Canada (5,405 miles away) is the far-away foreign place with temperatures most similar to Xiwulan Bulang (view comparison). CloudsThe winter in Xiwulan Bulang experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 25% to 35%. The lowest chance of overcast or mostly cloudy conditions is 25% on December 7. The clearest day of the winter is December 7, with clear, mostly clear, or partly cloudy conditions 75% of the time. For reference, on June 16, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 42%, while on December 7, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 75%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Xiwulan Bulang, the chance of a wet day over the course of the winter is essentially constant, remaining around 1% throughout. For reference, the year's highest daily chance of a wet day is 33% on July 30, and its lowest chance is 0% on January 13. SunOver the course of the winter in Xiwulan Bulang, the length of the day is rapidly increasing. From the start to the end of the season, the length of the day increases by 1 hour, 47 minutes, implying an average daily increase of 1 minute, 12 seconds, and weekly increase of 8 minutes, 26 seconds. The shortest day of the winter is December 21, with 9 hours, 13 minutes of daylight and the longest day is February 28, with 11 hours, 13 minutes of daylight. The latest sunrise of the winter in Xiwulan Bulang is 8:01 AM on January 4 and the earliest sunrise is 49 minutes earlier at 7:12 AM on February 28. The earliest sunset is 5:07 PM on December 7 and the latest sunset is 1 hour, 18 minutes later at 6:25 PM on February 28. Daylight saving time is not observed in Xiwulan Bulang during 2024. For reference, on June 20, the longest day of the year, the Sun rises at 5:03 AM and sets 15 hours, 8 minutes later, at 8:12 PM, while on December 21, the shortest day of the year, it rises at 7:57 AM and sets 9 hours, 13 minutes later, at 5:10 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 the winter of 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 Xiwulan Bulang is essentially constant during the winter, remaining around 0% throughout. For reference, on July 30, the muggiest day of the year, there are muggy conditions 2% of the time, while on September 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 Xiwulan Bulang is gradually increasing during the winter, increasing from 11.0 miles per hour to 11.6 miles per hour over the course of the season. For reference, on April 19, the windiest day of the year, the daily average wind speed is 13.2 miles per hour, while on August 16, the calmest day of the year, the daily average wind speed is 8.1 miles per hour. The lowest daily average wind speed during the winter is 10.4 miles per hour on January 19. The hourly average wind direction in Xiwulan Bulang throughout the winter is predominantly from the west, with a peak proportion of 51% on December 1. 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 Xiwulan Bulang typically lasts for 4.5 months (138 days), from around May 8 to around September 23, rarely starting before April 22 or after May 25, and rarely ending before September 8 or after October 8. The winter in Xiwulan Bulang is reliably fully outside of 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 Xiwulan Bulang are very rapidly decreasing during the winter, decreasing by 1,594°F, from 1,594°F to 0°F, over the course of the season. 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 Xiwulan Bulang is rapidly increasing during the winter, rising by 1.7 kWh, from 2.6 kWh to 4.3 kWh, over the course of the season. The lowest average daily incident shortwave solar energy during the winter is 2.4 kWh on December 21. TopographyFor the purposes of this report, the geographical coordinates of Xiwulan Bulang are 41.119 deg latitude, 110.969 deg longitude, and 5,778 ft elevation. The topography within 2 miles of Xiwulan Bulang contains only modest variations in elevation, with a maximum elevation change of 394 feet and an average elevation above sea level of 5,835 feet. Within 10 miles contains only modest variations in elevation (2,041 feet). Within 50 miles contains large variations in elevation (4,432 feet). The area within 2 miles of Xiwulan Bulang is covered by cropland (46%), grassland (21%), artificial surfaces (21%), and trees (12%), within 10 miles by grassland (64%) and cropland (20%), and within 50 miles by grassland (54%) and cropland (19%). Data SourcesThis report illustrates the typical weather in Xiwulan Bulang, 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, Hohhot Baita International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Xiwulan Bulang. At a distance of 78 kilometers from Xiwulan Bulang, 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 Xiwulan Bulang 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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