September Weather in Tangnaihai ChinaDaily high temperatures decrease by 8°F, from 68°F to 60°F, rarely falling below 53°F or exceeding 76°F. Daily low temperatures decrease by 7°F, from 45°F to 38°F, rarely falling below 32°F or exceeding 52°F. For reference, on July 28, the hottest day of the year, temperatures in Tangnaihai typically range from 49°F to 74°F, while on January 11, the coldest day of the year, they range from 7°F to 33°F. The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. 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. Hanceville, Canada (5,864 miles away); Calgary, Canada (6,112 miles); and Del Norte, United States (7,111 miles) are the far-away foreign places with temperatures most similar to Tangnaihai (view comparison). CloudsThe month of September in Tangnaihai experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 37% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 36% on September 7. The clearest day of the month is September 7, with clear, mostly clear, or partly cloudy conditions 64% of the time. For reference, on March 25, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 57%, while on November 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 70%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Tangnaihai, the chance of a wet day over the course of September is very rapidly decreasing, starting the month at 30% and ending it at 17%. For reference, the year's highest daily chance of a wet day is 41% on June 26, and its lowest chance is 0% on January 26. 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 September in Tangnaihai is decreasing, starting the month at 1.5 inches, when it rarely exceeds 2.5 inches or falls below 0.7 inches, and ending the month at 0.8 inches, when it rarely exceeds 1.4 inches or falls below 0.3 inches. SunOver the course of September in Tangnaihai, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 4 minutes, implying an average daily decrease of 2 minutes, 12 seconds, and weekly decrease of 15 minutes, 24 seconds. The shortest day of the month is September 30, with 11 hours, 51 minutes of daylight and the longest day is September 1, with 12 hours, 55 minutes of daylight. The earliest sunrise of the month in Tangnaihai is 6:51 AM on September 1 and the latest sunrise is 22 minutes later at 7:13 AM on September 30. The latest sunset is 7:46 PM on September 1 and the earliest sunset is 42 minutes earlier at 7:04 PM on September 30. Daylight saving time is not observed in Tangnaihai during 2024. For reference, on June 20, the longest day of the year, the Sun rises at 6:04 AM and sets 14 hours, 34 minutes later, at 8:37 PM, while on December 21, the shortest day of the year, it rises at 8:24 AM and sets 9 hours, 45 minutes later, at 6:10 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 September 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 Tangnaihai is essentially constant during September, 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 Tangnaihai is essentially constant during September, remaining within 0.1 miles per hour of 5.5 miles per hour throughout. For reference, on March 7, the windiest day of the year, the daily average wind speed is 9.0 miles per hour, while on September 30, the calmest day of the year, the daily average wind speed is 5.4 miles per hour. The wind direction in Tangnaihai during September is predominantly out of the north from September 1 to September 19 and the west from September 19 to September 30. 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 Tangnaihai typically lasts for 4.9 months (150 days), from around May 4 to around October 1, rarely starting before April 15 or after May 26, and rarely ending before September 12 or after October 20. The month of September in Tangnaihai is more likely than not fully within the growing season, with the chance that a given day is in the growing season rapidly decreasing from 99% to 54% 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 Tangnaihai are gradually increasing during September, increasing by 146°F, from 1,110°F to 1,256°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 Tangnaihai is gradually decreasing during September, falling by 1.0 kWh, from 6.4 kWh to 5.4 kWh, over the course of the month. TopographyFor the purposes of this report, the geographical coordinates of Tangnaihai are 35.514 deg latitude, 100.131 deg longitude, and 8,976 ft elevation. The topography within 2 miles of Tangnaihai contains very significant variations in elevation, with a maximum elevation change of 1,850 feet and an average elevation above sea level of 9,290 feet. Within 10 miles contains very significant variations in elevation (5,997 feet). Within 50 miles also contains extreme variations in elevation (8,993 feet). The area within 2 miles of Tangnaihai is covered by grassland (48%), water (14%), and cropland (12%), within 10 miles by grassland (72%) and trees (15%), and within 50 miles by grassland (74%). Data SourcesThis report illustrates the typical weather in Tangnaihai, 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, Xining Caojiabao Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Tangnaihai. At a distance of 192 kilometers from Tangnaihai, 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 Tangnaihai to the nearest station, increasing from 0% at 150 kilometers to 100% at 200 kilometers. In this case, the MERRA-2 weight is 45%, making the weight assigned to the weather station 55%. 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. |