Climate and Average Weather Year Round in Ulaan-Ereg Mongolia

In Ulaan-Ereg, the summers are warm and partly cloudy and the winters are frigid, dry, and mostly clear. 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 Ulaan-Ereg for warm-weather activities is from late June to mid August.

The warm season lasts for 3.8 months, from May 17 to September 10, with an average daily high temperature above 68°F. The hottest month of the year in Ulaan-Ereg is July, with an average high of 82°F and low of 57°F.

The cold season lasts for 3.2 months, from November 19 to February 27, with an average daily high temperature below 25°F. The coldest month of the year in Ulaan-Ereg is January, with an average low of -9°F and high of 11°F.

In Ulaan-Ereg, 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 Ulaan-Ereg begins around July 29 and lasts for 7.0 months, ending around February 29.

The clearest month of the year in Ulaan-Ereg is January, during which on average the sky is clear, mostly clear, or partly cloudy 66% of the time.

The cloudier part of the year begins around February 29 and lasts for 5.0 months, ending around July 29.

The cloudiest month of the year in Ulaan-Ereg is June, during which on average the sky is overcast or mostly cloudy 46% of the time.

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

The wetter season lasts 3.1 months, from June 4 to September 8, with a greater than 14% chance of a given day being a wet day. The month with the most wet days in Ulaan-Ereg is July, with an average of 8.1 days with at least 0.04 inches of precipitation.

The drier season lasts 8.9 months, from September 8 to June 4. The month with the fewest wet days in Ulaan-Ereg is December, 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 Ulaan-Ereg changes throughout the year.

Rain alone is the most common for 6.9 months, from March 30 to October 26. The month with the most days of rain alone in Ulaan-Ereg is July, with an average of 8.1 days.

Snow alone is the most common for 5.1 months, from October 26 to March 30. The month with the most days of snow alone in Ulaan-Ereg is November, with an average of 0.3 days.

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. Ulaan-Ereg experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 4.1 months, from May 19 to September 22, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Ulaan-Ereg is July, with an average rainfall of 1.6 inches.

The rainless period of the year lasts for 7.9 months, from September 22 to May 19. The month with the least rain in Ulaan-Ereg is January, with an average rainfall of 0.0 inches.

The length of the day in Ulaan-Ereg varies significantly over the course of the year. In 2024, the shortest day is December 21, with 8 hours, 31 minutes of daylight; the longest day is June 21, with 15 hours, 53 minutes of daylight.

The earliest sunrise is at 4:45 AM on June 16, and the latest sunrise is 3 hours, 41 minutes later at 8:26 AM on January 2. The earliest sunset is at 4:52 PM on December 10, and the latest sunset is 3 hours, 48 minutes later at 8:39 PM on June 26.

Daylight saving time (DST) is not observed in Ulaan-Ereg during 2024.

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.

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 Ulaan-Ereg, 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.

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 Ulaan-Ereg experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 3.0 months, from March 9 to June 10, with average wind speeds of more than 10.3 miles per hour. The windiest month of the year in Ulaan-Ereg is April, with an average hourly wind speed of 12.0 miles per hour.

The calmer time of year lasts for 9.0 months, from June 10 to March 9. The calmest month of the year in Ulaan-Ereg is August, with an average hourly wind speed of 8.3 miles per hour.

The predominant average hourly wind direction in Ulaan-Ereg varies throughout the year.

The wind is most often from the north for 6.2 months, from March 5 to September 11, with a peak percentage of 42% on May 2. The wind is most often from the west for 5.8 months, from September 11 to March 5, with a peak percentage of 53% on January 1.

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

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 Ulaan-Ereg for hot-weather activities is from early July to early August, with a peak score in the third week of July.

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 Ulaan-Ereg typically lasts for 4.0 months (122 days), from around May 17 to around September 16, rarely starting before May 1 or after June 2, and rarely ending before September 1 or after October 1.

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 Ulaan-Ereg should appear around May 8, only rarely appearing before April 30 or after May 15.

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 20 to August 8, with an average daily incident shortwave energy per square meter above 6.1 kWh. The brightest month of the year in Ulaan-Ereg is June, with an average of 7.1 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 2.7 kWh. The darkest month of the year in Ulaan-Ereg is December, with an average of 1.7 kWh.

For the purposes of this report, the geographical coordinates of Ulaan-Ereg are 46.900 deg latitude, 109.750 deg longitude, and 3,638 ft elevation.

The topography within 2 miles of Ulaan-Ereg contains only modest variations in elevation, with a maximum elevation change of 282 feet and an average elevation above sea level of 3,691 feet. Within 10 miles contains only modest variations in elevation (840 feet). Within 50 miles contains very significant variations in elevation (2,497 feet).

The area within 2 miles of Ulaan-Ereg is covered by sparse vegetation (43%), grassland (27%), and bare soil (22%), within 10 miles by sparse vegetation (84%), and within 50 miles by sparse vegetation (75%) and bare soil (16%).