Fall Weather in Sayn-Ust Mongolia

Daily high temperatures decrease by 48°F, from 71°F to 23°F, rarely falling below 12°F or exceeding 81°F.

Daily low temperatures decrease by 41°F, from 46°F to 5°F, rarely falling below -4°F or exceeding 54°F.

For reference, on July 14, the hottest day of the year, temperatures in Sayn-Ust typically range from 56°F to 80°F, while on January 20, the coldest day of the year, they range from -5°F to 14°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.

Saskatoon, Saskatchewan, Canada (5,456 miles away) and Brandon, Manitoba, Canada (5,671 miles) are the far-away foreign places with temperatures most similar to Sayn-Ust (view comparison).

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The fall in Sayn-Ust experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 31% to 37%. The lowest chance of overcast or mostly cloudy conditions is 30% on September 18.

The clearest day of the fall is September 18, with clear, mostly clear, or partly cloudy conditions 70% of the time.

For reference, on April 14, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 41%, while on September 18, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 70%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Sayn-Ust, the chance of a wet day over the course of the fall is very rapidly decreasing, starting the season at 9% and ending it at 0%.

For reference, the year's highest daily chance of a wet day is 18% on July 5, and its lowest chance is 0% on January 6.

Rainfall

To 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 Sayn-Ust is gradually decreasing, starting the season at 0.4 inches, when it rarely exceeds 0.8 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.

Over the course of the fall in Sayn-Ust, 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, 35 minutes, implying an average daily decrease of 3 minutes, 3 seconds, and weekly decrease of 21 minutes, 21 seconds.

The shortest day of the fall is November 30, with 8 hours, 47 minutes of daylight and the longest day is September 1, with 13 hours, 22 minutes of daylight.

The earliest sunrise of the fall in Sayn-Ust is 6:00 AM on September 1 and the latest sunrise is 2 hours, 6 minutes later at 8:06 AM on November 30.

The latest sunset is 7:22 PM on September 1 and the earliest sunset is 2 hours, 28 minutes earlier at 4:53 PM on November 30.

Daylight saving time is not observed in Sayn-Ust during 2025.

For reference, on June 21, the longest day of the year, the Sun rises at 4:45 AM and sets 15 hours, 57 minutes later, at 8:42 PM, while on December 21, the shortest day of the year, it rises at 8:26 AM and sets 8 hours, 28 minutes later, at 4:53 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.

The figure below presents a compact representation of key lunar data for the fall of 2025. 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.

We 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 Sayn-Ust is essentially constant during the fall, remaining around 0% throughout.

This 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 Sayn-Ust is gradually decreasing during the fall, decreasing from 7.4 miles per hour to 6.5 miles per hour over the course of the season.

For reference, on May 8, the windiest day of the year, the daily average wind speed is 9.9 miles per hour, while on January 22, the calmest day of the year, the daily average wind speed is 5.9 miles per hour.

The wind direction in Sayn-Ust during the fall is predominantly out of the north from September 1 to October 17 and the south from October 17 to November 30.

Definitions 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 Sayn-Ust typically lasts for 3.9 months (121 days), from around May 19 to around September 16, rarely starting before April 29 or after June 5, and rarely ending before September 1 or after October 2.

During the fall in Sayn-Ust, the chance that a given day is within the growing season is very rapidly decreasing falling from 90% 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 Sayn-Ust are increasing during the fall, increasing by 207°F, from 1,750°F to 1,957°F, over the course of the season.

This 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 Sayn-Ust is very rapidly decreasing during the fall, falling by 4.0 kWh, from 5.8 kWh to 1.8 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Sayn-Ust are 47.357 deg latitude, 94.524 deg longitude, and 4,751 ft elevation.

The topography within 2 miles of Sayn-Ust contains only modest variations in elevation, with a maximum elevation change of 282 feet and an average elevation above sea level of 4,747 feet. Within 10 miles contains only modest variations in elevation (1,765 feet). Within 50 miles contains very significant variations in elevation (5,046 feet).

The area within 2 miles of Sayn-Ust is covered by bare soil (100%), within 10 miles by bare soil (100%), and within 50 miles by bare soil (100%).