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Climate and Average Weather Year Round in Ulan Bator Mongolia

In Ulan Bator, the summers are long and comfortable, the winters are frigid and dry, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from -19°F to 75°F and is rarely below -31°F or above 87°F.

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

Climate in Ulan Bator

frigidfreezingcoldcoolcomfortablecoolcoldfrigidJanFebMarAprMayJunJulAugSepOctNovDecNowNow62%62%51%51%clearovercastprecipitation: 2.1 inprecipitation: 2.1 in0.0 in0.0 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 5.6tourism score: 5.60.00.0
Ulan Bator weather by month. Click on each chart for more information.

The warm season lasts for 4.0 months, from May 13 to September 15, with an average daily high temperature above 61°F. The hottest month of the year in Ulan Bator is July, with an average high of 75°F and low of 54°F.

The cold season lasts for 3.0 months, from November 22 to February 22, with an average daily high temperature below 16°F. The coldest month of the year in Ulan Bator is January, with an average low of -18°F and high of 3°F.

Average High and Low Temperature in Ulan Bator

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.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 3°F13°F30°F48°F62°F71°F75°F71°F60°F44°F21°F6°F
Temp. -9°F-0°F17°F36°F50°F61°F65°F61°F48°F32°F10°F-4°F
Low -18°F-12°F5°F24°F38°F49°F54°F49°F36°F20°F-1°F-13°F

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 in Ulan Bator

Average Hourly Temperature in Ulan BatorJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNowNowfrigidfrigidfreezingcoldcoldcoolcomfortablefreezing
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.

High Level, Alberta, Canada (4,676 miles away) and Flin Flon, Manitoba, Canada (5,154 miles) are the far-away foreign places with temperatures most similar to Ulan Bator (view comparison).

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In Ulan Bator, 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 Ulan Bator begins around August 19 and lasts for 3.3 months, ending around November 27.

The clearest month of the year in Ulan Bator is October, during which on average the sky is clear, mostly clear, or partly cloudy 61% of the time.

The cloudier part of the year begins around November 27 and lasts for 8.7 months, ending around August 19.

The cloudiest month of the year in Ulan Bator is June, during which on average the sky is overcast or mostly cloudy 48% of the time.

Cloud Cover Categories in Ulan Bator

Cloud Cover Categories in Ulan BatorclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 262%Oct 262%Jun 2351%Jun 2351%Aug 1956%Aug 1956%Nov 2757%Nov 2757%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.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 42%41%43%45%47%48%45%43%39%39%41%44%
Clearer 58%59%57%55%53%52%55%57%61%61%59%56%

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

The wetter season lasts 3.3 months, from May 31 to September 8, with a greater than 16% chance of a given day being a wet day. The month with the most wet days in Ulan Bator is July, with an average of 9.7 days with at least 0.04 inches of precipitation.

The drier season lasts 8.7 months, from September 8 to May 31. The month with the fewest wet days in Ulan Bator is January, with an average of 0.2 days with at least 0.04 inches of precipitation.

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 in Ulan Bator changes throughout the year.

Rain alone is the most common for 6.7 months, from April 2 to October 23. The month with the most days of rain alone in Ulan Bator is July, with an average of 9.7 days.

Snow alone is the most common for 5.3 months, from October 23 to April 2. The month with the most days of snow alone in Ulan Bator is November, with an average of 0.5 days.

Daily Chance of Precipitation in Ulan Bator

Daily Chance of Precipitation in Ulan BatorsnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jul 2033%Jul 2033%Jan 290%Jan 290%Apr 22%Apr 22%Oct 234%Oct 234%May 3116%May 3116%Sep 816%Sep 816%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).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 0.0d0.0d0.1d0.8d3.2d7.2d9.7d8.5d3.8d1.0d0.0d0.0d
Mixed 0.0d0.0d0.1d0.3d0.2d0.0d0.0d0.0d0.2d0.2d0.0d0.0d
Snow 0.2d0.2d0.3d0.2d0.1d0.0d0.0d0.0d0.1d0.4d0.5d0.2d
Any 0.2d0.2d0.5d1.3d3.5d7.2d9.7d8.6d4.1d1.6d0.6d0.2d

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. Ulan Bator experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 4.5 months, from May 9 to September 24, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Ulan Bator is July, with an average rainfall of 2.1 inches.

The rainless period of the year lasts for 7.5 months, from September 24 to May 9. The month with the least rain in Ulan Bator is December, with an average rainfall of -0.0 inches.

Average Monthly Rainfall in Ulan Bator

Average Monthly Rainfall in Ulan BatorrainJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 in3.0 in3.0 in3.5 in3.5 inJul 292.1 inJul 292.1 inDec 15-0.0 inDec 15-0.0 inMay 90.5 inMay 90.5 inSep 240.5 inSep 240.5 in
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 snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 0.0″0.0″0.0″0.1″0.6″1.5″2.1″1.8″0.7″0.2″0.0″0.0″

The length of the day in Ulan Bator varies extremely over the course of the year. In 2024, the shortest day is December 21, with 8 hours, 23 minutes of daylight; the longest day is June 21, with 16 hours, 2 minutes of daylight.

Hours of Daylight and Twilight in Ulan Bator

Hours of Daylight and Twilight in Ulan BatorJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2016 hr, 2 minJun 2116 hr, 2 minJun 2112 hr, 11 minSep 2212 hr, 11 minSep 228 hr, 23 minDec 218 hr, 23 minDec 21nightnightdayNowNow
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.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 8.9h10.2h11.9h13.7h15.2h16.0h15.6h14.2h12.6h10.8h9.3h8.5h

The earliest sunrise is at 4:52 AM on June 16, and the latest sunrise is 3 hours, 49 minutes later at 8:41 AM on January 2. The earliest sunset is at 4:59 PM on December 10, and the latest sunset is 3 hours, 56 minutes later at 8:55 PM on June 26.

Daylight saving time (DST) is not observed in Ulan Bator during 2024.

Sunrise & Sunset with Twilight in Ulan Bator

Sunrise & Sunset with Twilight in Ulan BatorJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 164:52 AMJun 164:52 AM8:55 PMJun 268:55 PMJun 26Dec 104:59 PMDec 104:59 PM8:41 AMJan 28:41 AMJan 2daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2024. 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.

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.

Solar Elevation and Azimuth in Ulan Bator

Solar Elevation and Azimuth in Ulan BatorJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AM0000101010102020203030404050600000101010102020202030303040405050601966NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

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

Moon Rise, Set & Phases in Ulan Bator

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

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 Ulan Bator, 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 in Ulan Bator

Humidity Comfort Levels in Ulan BatorJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jan 240%Jan 240%Aug 10%Aug 10%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.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d

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 Ulan Bator experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 3.0 months, from March 10 to June 11, with average wind speeds of more than 9.9 miles per hour. The windiest month of the year in Ulan Bator is April, with an average hourly wind speed of 11.5 miles per hour.

The calmer time of year lasts for 9.0 months, from June 11 to March 10. The calmest month of the year in Ulan Bator is January, with an average hourly wind speed of 8.0 miles per hour.

Average Wind Speed in Ulan Bator

Average Wind Speed in Ulan BatorwindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mph20 mph20 mphMay 311.9 mphMay 311.9 mphJan 87.9 mphJan 87.9 mphMar 109.9 mphMar 109.9 mphJun 119.9 mphJun 119.9 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 8.08.810.111.511.39.78.58.38.99.18.88.3

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

The wind is most often from the west for 2.0 months, from October 25 to December 25, with a peak percentage of 39% on November 29. The wind is most often from the north for 10 months, from December 25 to October 25, with a peak percentage of 35% on January 1.

Wind Direction in Ulan Bator

Wind Direction in Ulan BatorNWJanFebMarAprMayJunJulAugSepOctNovDec0%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).

To characterize how pleasant the weather is in Ulan Bator 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 Ulan Bator for general outdoor tourist activities is from late June to early August, with a peak score in the third week of July.

Tourism Score in Ulan Bator

Tourism Score in Ulan BatorJanFebMarAprMayJunJulAugSepOctNovDec002244668810105.65.60.00.0NowNowtemperaturetemperaturecloudscloudsprecipitationprecipitationtourism 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 Ulan Bator for hot-weather activities is from early July to early August, with a peak score in the third week of July.

Beach/Pool Score in Ulan Bator

Beach/Pool Score in Ulan BatorJanFebMarAprMayJunJulAugSepOctNovDec002244668810102.22.20.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitation
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.

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 Ulan Bator typically lasts for 3.5 months (107 days), from around May 25 to around September 9, rarely starting before May 6 or after June 13, and rarely ending before August 24 or after September 26.

Time Spent in Various Temperature Bands and the Growing Season in Ulan Bator

Time Spent in Various Temperature Bands and the Growing Season in Ulan Batorgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 2550%May 2550%Sep 950%Sep 950%Jun 1390%Jun 1390%Aug 2490%Aug 2490%May 610%May 610%Sep 2610%Sep 2610%0%Feb 220%Feb 22Jul 20100%Jul 20100%NowNowfrigidcoldcoolcomfortablefreezingvery coldhot
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 Ulan Bator should appear around May 13, only rarely appearing before May 5 or after May 21.

Growing Degree Days in Ulan Bator

Growing Degree Days in Ulan BatorJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F200°F200°F400°F400°F600°F600°F800°F800°F1,000°F1,000°F1,200°F1,200°F1,400°F1,400°F1,600°F1,600°F1,800°F1,800°FMay 1390°FMay 1390°FJul 23900°FJul 23900°FDec 311,524°FDec 311,524°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

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 3.6 months, from April 21 to August 8, with an average daily incident shortwave energy per square meter above 6.0 kWh. The brightest month of the year in Ulan Bator is June, with an average of 7.0 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 2.6 kWh. The darkest month of the year in Ulan Bator is December, with an average of 1.5 kWh.

Average Daily Incident Shortwave Solar Energy in Ulan Bator

Average Daily Incident Shortwave Solar Energy in Ulan BatorbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJun 47.1 kWhJun 47.1 kWhDec 211.4 kWhDec 211.4 kWhApr 216.0 kWhApr 216.0 kWhAug 86.0 kWhAug 86.0 kWhNov 12.6 kWhNov 12.6 kWhFeb 72.6 kWhFeb 72.6 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.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 1.82.94.45.86.87.06.65.84.73.32.11.5

For the purposes of this report, the geographical coordinates of Ulan Bator are 47.908 deg latitude, 106.883 deg longitude, and 4,213 ft elevation.

The topography within 2 miles of Ulan Bator contains significant variations in elevation, with a maximum elevation change of 636 feet and an average elevation above sea level of 4,268 feet. Within 10 miles contains significant variations in elevation (3,340 feet). Within 50 miles also contains extreme variations in elevation (5,912 feet).

The area within 2 miles of Ulan Bator is covered by artificial surfaces (84%), within 10 miles by sparse vegetation (30%) and artificial surfaces (18%), and within 50 miles by sparse vegetation (54%) and grassland (23%).

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

Temperature and Dew Point

There is only a single weather station, Ulan-Bator Chinggis Khan International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Ulan Bator.

At a distance of 11 kilometers from Ulan Bator, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.

The station records are corrected for the elevation difference between the station and Ulan Bator according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.

Other Data

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.

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.

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.

Please review our full terms contained on our Terms of Service page.