Fall Weather in Altai MongoliaDaily high temperatures decrease by 46°F, from 64°F to 18°F, rarely falling below 7°F or exceeding 73°F. Daily low temperatures decrease by 40°F, from 38°F to -1°F, rarely falling below -11°F or exceeding 46°F. For reference, on July 15, the hottest day of the year, temperatures in Altai typically range from 48°F to 72°F, while on January 17, the coldest day of the year, they range from -11°F to 10°F. The figure below shows you a compact characterization of the hourly average fall 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. Haines Junction, Yukon, Canada (4,454 miles away) and High Level, Alberta, Canada (4,949 miles) are the far-away foreign places with temperatures most similar to Altai (view comparison). CloudsThe fall in Altai experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 31% throughout the season. The highest chance of overcast or mostly cloudy conditions is 33% on November 25. The lowest chance of overcast or mostly cloudy conditions is 28% on September 17. The clearest day of the fall is September 17, with clear, mostly clear, or partly cloudy conditions 72% of the time. For reference, on April 13, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 40%, while on September 17, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 72%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Altai, the chance of a wet day over the course of the fall is very rapidly decreasing, starting the season at 13% and ending it at 0%. For reference, the year's highest daily chance of a wet day is 21% on July 3, and its lowest chance is 0% on November 30. Over the course of the fall in Altai, the chance of a day with only rain decreases from 12% to 0%, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 1% throughout. RainfallTo show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day. The average sliding 31-day rainfall during the fall in Altai is decreasing, starting the season at 0.6 inches, when it rarely exceeds 1.3 inches or falls below 0.1 inches, and ending the season at 0.0 inches, when it rarely exceeds 0.0 inches or falls below -0.0 inches. SunOver the course of the fall in Altai, the length of the day is very rapidly decreasing. From the start to the end of the season, the length of the day decreases by 4 hours, 24 minutes, implying an average daily decrease of 2 minutes, 56 seconds, and weekly decrease of 20 minutes, 34 seconds. The shortest day of the fall is November 30, with 8 hours, 54 minutes of daylight and the longest day is September 1, with 13 hours, 18 minutes of daylight. The earliest sunrise of the fall in Altai is 5:55 AM on September 1 and the latest sunrise is 2 hours, 1 minute later at 7:56 AM on November 30. The latest sunset is 7:13 PM on September 1 and the earliest sunset is 2 hours, 23 minutes earlier at 4:50 PM on November 30. Daylight saving time is not observed in Altai during 2024. For reference, on June 20, the longest day of the year, the Sun rises at 4:42 AM and sets 15 hours, 48 minutes later, at 8:30 PM, while on December 21, the shortest day of the year, it rises at 8:15 AM and sets 8 hours, 35 minutes later, at 4:50 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 fall 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 Altai is essentially constant during the fall, 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 Altai is gradually decreasing during the fall, decreasing from 8.5 miles per hour to 7.9 miles per hour over the course of the season. For reference, on April 28, the windiest day of the year, the daily average wind speed is 11.5 miles per hour, while on January 23, the calmest day of the year, the daily average wind speed is 6.9 miles per hour. The highest daily average wind speed during the fall is 8.9 miles per hour on October 27. The hourly average wind direction in Altai throughout the fall is predominantly from the west, with a peak proportion of 47% on October 19. 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 Altai typically lasts for 2.7 months (85 days), from around June 5 to around August 29, rarely starting before May 20 or after June 26, and rarely ending before August 10 or after September 15. The fall in Altai is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season rapidly decreasing from 43% to -0% over the course of the 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 Altai are gradually increasing during the fall, increasing by 94°F, from 978°F to 1,072°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 Altai is very rapidly decreasing during the fall, falling by 3.9 kWh, from 5.9 kWh to 2.0 kWh, over the course of the season. TopographyFor the purposes of this report, the geographical coordinates of Altai are 46.372 deg latitude, 96.258 deg longitude, and 7,073 ft elevation. The topography within 2 miles of Altai contains only modest variations in elevation, with a maximum elevation change of 446 feet and an average elevation above sea level of 7,108 feet. Within 10 miles contains only modest variations in elevation (3,510 feet). Within 50 miles also contains extreme variations in elevation (8,625 feet). The area within 2 miles of Altai is covered by bare soil (100%), within 10 miles by bare soil (99%), and within 50 miles by bare soil (98%). Data SourcesThis report illustrates the typical weather in Altai, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Altai 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 Altai, 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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