January Weather in Heishui ChinaDaily high temperatures are around 43°F, rarely falling below 33°F or exceeding 55°F. The lowest daily average high temperature is 42°F on January 18. Daily low temperatures are around 28°F, rarely falling below 21°F or exceeding 36°F. The lowest daily average low temperature is 27°F on January 19. For reference, on July 25, the hottest day of the year, temperatures in Heishui typically range from 68°F to 82°F, while on January 19, the coldest day of the year, they range from 27°F to 42°F. The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on January. 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. Jenkins, United States (7,810 miles away) is the far-away foreign place with temperatures most similar to Heishui (view comparison). CloudsThe month of January in Heishui experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 43% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 42% on January 20. The clearest day of the month is January 20, with clear, mostly clear, or partly cloudy conditions 58% of the time. For reference, on July 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 70%, while on January 20, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 58%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Heishui, the chance of a wet day over the course of January is gradually increasing, starting the month at 7% and ending it at 10%. For reference, the year's highest daily chance of a wet day is 48% on June 20, and its lowest chance is 7% on December 28. Over the course of January in Heishui, the chance of a day with only rain remains an essentially constant 3% throughout, the chance of a day with mixed snow and rain remains an essentially constant 3% throughout, and the chance of a day with only snow remains an essentially constant 3% 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 January in Heishui is essentially constant, remaining about 0.3 inches throughout, and rarely exceeding 0.8 inches. The lowest average 31-day accumulation is 0.2 inches on January 13. 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 January in Heishui is essentially constant, remaining about 2.7 inches throughout, and rarely exceeding 7.5 inches or falling to 0.0 inches. The highest average 31-day accumulation is 3.0 inches on January 14. SunOver the course of January in Heishui, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 28 minutes, implying an average daily increase of 56 seconds, and weekly increase of 6 minutes, 32 seconds. The shortest day of the month is January 1, with 10 hours, 19 minutes of daylight and the longest day is January 31, with 10 hours, 47 minutes of daylight. The latest sunrise of the month in Heishui is 7:39 AM on January 11 and the earliest sunrise is 5 minutes earlier at 7:34 AM on January 31. The earliest sunset is 5:57 PM on January 1 and the latest sunset is 24 minutes later at 6:21 PM on January 31. Daylight saving time is not observed in Heishui during 2024. For reference, on June 20, the longest day of the year, the Sun rises at 5:46 AM and sets 14 hours, 0 minutes later, at 7:46 PM, while on December 21, the shortest day of the year, it rises at 7:34 AM and sets 10 hours, 17 minutes later, at 5:51 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 January 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 Heishui is essentially constant during January, remaining around 0% throughout. For reference, on July 23, the muggiest day of the year, there are muggy conditions 95% 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 Heishui is essentially constant during January, remaining within 0.2 miles per hour of 4.9 miles per hour throughout. For reference, on March 9, the windiest day of the year, the daily average wind speed is 6.0 miles per hour, while on December 5, the calmest day of the year, the daily average wind speed is 4.5 miles per hour. The hourly average wind direction in Heishui throughout January is predominantly from the east, with a peak proportion of 64% on January 31. 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 Heishui typically lasts for 8.1 months (249 days), from around March 18 to around November 21, rarely starting before February 27 or after April 6, and rarely ending before November 3 or after December 9. The month of January in Heishui 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 Heishui are essentially constant during January, remaining within 2°F of 2°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 Heishui is essentially constant during January, remaining within 0.2 kWh of 2.8 kWh throughout. TopographyFor the purposes of this report, the geographical coordinates of Heishui are 29.056 deg latitude, 108.796 deg longitude, and 2,858 ft elevation. The topography within 2 miles of Heishui contains large variations in elevation, with a maximum elevation change of 3,100 feet and an average elevation above sea level of 3,318 feet. Within 10 miles contains large variations in elevation (3,970 feet). Within 50 miles also contains extreme variations in elevation (5,758 feet). The area within 2 miles of Heishui is covered by grassland (50%), shrubs (25%), cropland (14%), and trees (11%), within 10 miles by grassland (44%) and trees (21%), and within 50 miles by trees (49%) and cropland (22%). Data SourcesThis report illustrates the typical weather in Heishui, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Heishui 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 Heishui, 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. 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. |