September Weather in Holboo MongoliaDaily high temperatures decrease by 13°F, from 66°F to 53°F, rarely falling below 41°F or exceeding 76°F. Daily low temperatures decrease by 12°F, from 42°F to 31°F, rarely falling below 23°F or exceeding 51°F. For reference, on July 13, the hottest day of the year, temperatures in Holboo typically range from 53°F to 76°F, while on January 19, the coldest day of the year, they range from -8°F to 10°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. Manning, Alberta, Canada (4,910 miles away) and Hudson Bay, Saskatchewan, Canada (5,356 miles) are the far-away foreign places with temperatures most similar to Holboo (view comparison). CloudsThe month of September in Holboo experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 36% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 34% on September 17. The clearest day of the month is September 17, with clear, mostly clear, or partly cloudy conditions 66% of the time. For reference, on April 13, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 46%, while on September 17, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 66%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Holboo, the chance of a wet day over the course of September is very rapidly decreasing, starting the month at 12% and ending it at 4%. For reference, the year's highest daily chance of a wet day is 26% on July 25, and its lowest chance is 0% on January 8. 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 Holboo is gradually decreasing, starting the month at 0.6 inches, when it rarely exceeds 1.1 inches or falls below 0.1 inches, and ending the month at 0.2 inches, when it rarely exceeds 0.3 inches. SunOver the course of September in Holboo, 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, 42 minutes, implying an average daily decrease of 3 minutes, 30 seconds, and weekly decrease of 24 minutes, 32 seconds. The shortest day of the month is September 30, with 11 hours, 43 minutes of daylight and the longest day is September 1, with 13 hours, 24 minutes of daylight. The earliest sunrise of the month in Holboo is 5:55 AM on September 1 and the latest sunrise is 41 minutes later at 6:36 AM on September 30. The latest sunset is 7:19 PM on September 1 and the earliest sunset is 1 hour, 1 minute earlier at 6:19 PM on September 30. Daylight saving time is not observed in Holboo during 2024. For reference, on June 20, the longest day of the year, the Sun rises at 4:35 AM and sets 16 hours, 8 minutes later, at 8:44 PM, while on December 21, the shortest day of the year, it rises at 8:27 AM and sets 8 hours, 17 minutes later, at 4:45 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 Holboo 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 Holboo is essentially constant during September, remaining within 0.2 miles per hour of 8.1 miles per hour throughout. For reference, on April 29, the windiest day of the year, the daily average wind speed is 10.2 miles per hour, while on August 4, the calmest day of the year, the daily average wind speed is 7.6 miles per hour. The wind direction in Holboo during September is predominantly out of the north from September 1 to September 6 and the south from September 6 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 Holboo typically lasts for 3.4 months (104 days), from around May 27 to around September 8, rarely starting before May 9 or after June 14, and rarely ending before August 21 or after September 24. During September in Holboo, the chance that a given day is within the growing season is very rapidly decreasing falling from 68% to 3% 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 Holboo are gradually increasing during September, increasing by 112°F, from 1,298°F to 1,410°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 Holboo is decreasing during September, falling by 1.4 kWh, from 5.6 kWh to 4.2 kWh, over the course of the month. TopographyFor the purposes of this report, the geographical coordinates of Holboo are 48.589 deg latitude, 95.433 deg longitude, and 5,144 ft elevation. The topography within 2 miles of Holboo contains only modest variations in elevation, with a maximum elevation change of 305 feet and an average elevation above sea level of 5,175 feet. Within 10 miles contains only modest variations in elevation (1,729 feet). Within 50 miles contains very significant variations in elevation (5,449 feet). The area within 2 miles of Holboo is covered by bare soil (86%) and water (14%), within 10 miles by bare soil (98%), and within 50 miles by bare soil (75%) and sparse vegetation (22%). Data SourcesThis report illustrates the typical weather in Holboo, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Holboo 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 Holboo, 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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