1. WeatherSpark.com
  2. Mongolia
  3. East Gobi Aymag

Average Weather in Bayan Mongolia

In Bayan, the summers are warm and partly cloudy, the winters are frigid and mostly clear, and it is dry year round. Over the course of the year, the temperature typically varies from -10°F to 83°F and is rarely below -20°F or above 93°F.

Based on the tourism score, the best time of year to visit Bayan for warm-weather activities is from late June to mid August.

Climate Summary

frigidfreezingcoldcoolwarmcoolfrigidJanFebMarAprMayJunJulAugSepOctNovDecNowNow71%71%56%56%clearovercastprecipitation: 1.3 inprecipitation: 1.3 in0.0 in0.0 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 6.5tourism score: 6.50.00.0
Click on each chart for more information.

Temperature

The warm season lasts for 3.8 months, from May 18 to September 10, with an average daily high temperature above 68°F. The hottest day of the year is July 19, with an average high of 83°F and low of 58°F.

The cold season lasts for 3.2 months, from November 19 to February 26, with an average daily high temperature below 24°F. The coldest day of the year is January 18, with an average low of -10°F and high of 10°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

Average Hourly Temperature in BayanJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMNowNowfrigidfrigidcoolwarmcoldfreezingcoldfreezingcomfortable
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Fort McMurray, Canada (4,934 miles away); Prince Albert, Canada (5,252 miles); and Rivers, Canada (5,546 miles) are the far-away foreign places with temperatures most similar to Bayan (view comparison).

Clouds

In Bayan, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year in Bayan begins around July 29 and lasts for 7.1 months, ending around March 1. On January 20, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 71% of the time, and overcast or mostly cloudy 29% of the time.

The cloudier part of the year begins around March 1 and lasts for 4.9 months, ending around July 29. On June 22, the cloudiest day of the year, the sky is overcast or mostly cloudy 44% of the time, and clear, mostly clear, or partly cloudy 56% of the time.

Cloud Cover Categories

Cloud Cover Categories in BayanclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jan 2071%Jan 2071%Jun 2256%Jun 2256%Jul 2963%Jul 2963%Mar 164%Mar 164%NowNowclearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Bayan varies throughout the year.

The wetter season lasts 3.1 months, from June 3 to September 8, with a greater than 12% chance of a given day being a wet day. The chance of a wet day peaks at 24% on July 4.

The drier season lasts 8.9 months, from September 8 to June 3. The smallest chance of a wet day is 0% on January 16.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 24% on July 4.

Daily Chance of Precipitation

Daily Chance of Precipitation in BayanwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jul 424%Jul 424%Jan 160%Jan 160%Mar 261%Mar 261%Nov 11%Nov 11%Jun 312%Jun 312%Sep 812%Sep 812%NowNowrain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Bayan experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 3.7 months, from May 27 to September 17, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around July 18, with an average total accumulation of 1.3 inches.

The rainless period of the year lasts for 8.3 months, from September 17 to May 27. The least rain falls around January 3, with an average total accumulation of 0.0 inches.

Average Monthly Rainfall

Average Monthly Rainfall in BayanrainJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.5 in1.0 in1.5 in2.0 in2.5 in3.0 inJul 181.3 inJul 181.3 inJan 30.0 inJan 30.0 inMay 270.5 inMay 270.5 inSep 170.5 inSep 170.5 inNowNow
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Sun

The length of the day in Bayan varies significantly over the course of the year. In 2020, the shortest day is December 21, with 8 hours, 36 minutes of daylight; the longest day is June 21, with 15 hours, 47 minutes of daylight.

Hours of Daylight and Twilight

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 4:46 AM on June 16, and the latest sunrise is 3 hours, 35 minutes later at 8:22 AM on January 3. The earliest sunset is at 4:52 PM on December 10, and the latest sunset is 3 hours, 42 minutes later at 8:35 PM on June 25.

Daylight saving time (DST) is not observed in Bayan during 2020.

Sunrise & Sunset with Twilight

Sunrise & Sunset with Twilight in BayanJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 164:46 AMJun 164:46 AM8:35 PMJun 258:35 PMJun 25Dec 104:52 PMDec 104:52 PM8:22 AMJan 38:22 AMJan 3daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2020. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Humidity

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 perceived humidity level in Bayan, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.

Humidity Comfort Levels

Humidity Comfort Levels in BayanJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jan 180%Jan 180%Jul 190%Jul 190%NowNowdrydry
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

Wind

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 Bayan experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 2.9 months, from March 15 to June 11, with average wind speeds of more than 10.8 miles per hour. The windiest day of the year is May 3, with an average hourly wind speed of 13.0 miles per hour.

The calmer time of year lasts for 9.1 months, from June 11 to March 15. The calmest day of the year is August 14, with an average hourly wind speed of 8.7 miles per hour.

Average Wind Speed

Average Wind Speed in BayanwindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mph16 mph18 mph20 mph22 mphMay 313.0 mphMay 313.0 mphAug 148.7 mphAug 148.7 mphMar 1510.8 mphMar 1510.8 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Bayan varies throughout the year.

The wind is most often from the west for 2.4 months, from October 14 to December 25, with a peak percentage of 43% on December 4. The wind is most often from the north for 9.6 months, from December 25 to October 14, with a peak percentage of 40% on January 1.

Wind Direction

Wind Direction in BayanNWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsouthnortheast
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Best Time of Year to Visit

To characterize how pleasant the weather is in Bayan throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Bayan for general outdoor tourist activities is from late June to mid August, with a peak score in the third week of July.

Tourism Score

Tourism Score in BayanJanFebMarAprMayJunJulAugSepOctNovDec02468106.56.50.00.0NowNow precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Bayan for hot-weather activities is from early July to early August, with a peak score in the third week of July.

Beach/Pool Score

Beach/Pool Score in BayanJanFebMarAprMayJunJulAugSepOctNovDec02468103.03.00.00.0NowNow precipitationprecipitationcloudsclouds
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Growing Season

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 Bayan typically lasts for 4.1 months (125 days), from around May 14 to around September 17, rarely starting before April 29 or after May 30, and rarely ending before September 2 or after October 1.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Bayangrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 1450%May 1450%Sep 1750%Sep 1750%May 3090%May 3090%Sep 290%Sep 290%Apr 2910%Apr 2910%Oct 110%Oct 110%0%Nov 220%Nov 22Jul 17100%Jul 17100%NowNowfrigidcoolcomfortablewarmhotfreezingvery cold
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within 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.

Based on growing degree days alone, the first spring blooms in Bayan should appear around May 8, only rarely appearing before April 30 or after May 15.

Growing Degree Days

The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.7 months, from April 18 to August 9, with an average daily incident shortwave energy per square meter above 6.2 kWh. The brightest day of the year is May 28, with an average of 7.4 kWh.

The darker period of the year lasts for 3.2 months, from November 1 to February 7, with an average daily incident shortwave energy per square meter below 2.8 kWh. The darkest day of the year is December 21, with an average of 1.7 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in BayanbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhMay 287.4 kWhMay 287.4 kWhDec 211.7 kWhDec 211.7 kWhAug 96.2 kWhAug 96.2 kWhFeb 72.8 kWhFeb 72.8 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Bayan are 46.250 deg latitude, 110.167 deg longitude, and 3,862 ft elevation.

The topography within 2 miles of Bayan contains only modest variations in elevation, with a maximum elevation change of 282 feet and an average elevation above sea level of 3,868 feet. Within 10 miles contains only modest variations in elevation (896 feet). Within 50 miles contains very significant variations in elevation (2,562 feet).

The area within 2 miles of Bayan is covered by bare soil (88%), within 10 miles by bare soil (97%), and within 50 miles by bare soil (62%) and sparse vegetation (35%).

Data Sources

This report illustrates the typical weather in Bayan, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Bayan 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 Bayan, 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 aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

Disclaimer

The 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.