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Monthly climate in Bayan-Ulaan, Mongolia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Bayan-Ulaan features a subarctic climate (Dwc). Temperatures typically range between -18 °C (0 °F) and 16 °C (61 °F) through the year, but rarely can drop to -37 °C (-35 °F) or can rise to as high as 31 °C (89 °F). The average annual precipitation amounts to about 340 mm (13.4 inches) and receives 60 rainy days on the 1 mm (0.04 inches) threshold annually. Bayan-Ulaan enjoys an average of 3797 hours of sunshine throughout the year, and daylight varies from 8 hours 37 minutes to 15 hours 44 minutes per day.

Monthly average temperatures in Bayan-Ulaan, Mongolia

The warmest months in Bayan-Ulaan are June, July and August, with daily mean temperatures ranging from 13 to 16 °C (56 - 61 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -18 to -15 °C (0 - 6 °F) throughout the day. On average each year, Bayan-Ulaan experiences 6 days above 25 °C (77.0 °F) and 212 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Bayan-Ulaan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum1°C
(34°F)		8°C
(47°F)		14°C
(58°F)		23°C
(74°F)		26°C
(79°F)		30°C
(86°F)		31°C
(89°F)		26°C
(79°F)		25°C
(78°F)		20°C
(69°F)		12°C
(54°F)		4°C
(39°F)
Mean maximum-2°C
(29°F)		2°C
(37°F)		10°C
(50°F)		19°C
(66°F)		24°C
(76°F)		26°C
(78°F)		27°C
(81°F)		25°C
(77°F)		21°C
(71°F)		15°C
(59°F)		10°C
(50°F)		1°C
(34°F)
Average high-11°C
(12°F)		-8°C
(18°F)		1°C
(34°F)		8°C
(47°F)		14°C
(58°F)		19°C
(67°F)		21°C
(70°F)		18°C
(66°F)		15°C
(59°F)		6°C
(43°F)		-2°C
(29°F)		-10°C
(15°F)
Daily mean-18°C
(0°F)		-15°C
(6°F)		-6°C
(22°F)		2°C
(35°F)		8°C
(47°F)		14°C
(57°F)		16°C
(61°F)		13°C
(56°F)		8°C
(47°F)		-1°C
(31°F)		-9°C
(17°F)		-16°C
(4°F)
Average low-23°C
(-9°F)		-21°C
(-5°F)		-12°C
(11°F)		-5°C
(24°F)		1°C
(34°F)		7°C
(45°F)		11°C
(51°F)		9°C
(48°F)		3°C
(37°F)		-6°C
(22°F)		-14°C
(8°F)		-20°C
(-5°F)
Mean minimum-30°C
(-22°F)		-29°C
(-20°F)		-21°C
(-5°F)		-13°C
(8°F)		-8°C
(17°F)		1°C
(33°F)		6°C
(43°F)		4°C
(39°F)		-5°C
(23°F)		-12°C
(11°F)		-23°C
(-9°F)		-29°C
(-20°F)
Minimum-37°C
(-34°F)		-37°C
(-35°F)		-23°C
(-8°F)		-20°C
(-4°F)		-12°C
(10°F)		-3°C
(28°F)		5°C
(41°F)		1°C
(35°F)		-8°C
(18°F)		-14°C
(8°F)		-25°C
(-12°F)		-35°C
(-31°F)

Compare climate in Bayan-Ulaan with other places

Compare temperature, precipitation, sunshine, UV index in Bayan-Ulaan, Mongolia with other places around the world.

Monthly average precipitation in Bayan-Ulaan, Mongolia

Bayan-Ulaan usually has the most precipitation in June, July and August, with an average of 11 rainy days and 72 mm (2.8 inches) of precipitation per month. The driest months in Bayan-Ulaan are January, November and December. On average, 4 mm (0.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Bayan-Ulaan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)3 (0.1)8 (0.3)13 (0.5)19 (0.8)25 (1.0)40 (1.6)86 (3.4)91 (3.6)32 (1.2)12 (0.5)6 (0.3)4 (0.2)
Average precipitation days (≥ 1 mm)02337913136220

Monthly sunshine hours in Bayan-Ulaan, Mongolia

The sunniest months in Bayan-Ulaan are May, June and July, when the sun shines an average of 12 hours 6 minutes a day. Least sunny months in Bayan-Ulaan: January, November and December receive an average of 8 hours 9 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Bayan-Ulaan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours214273329339374367372355322311271264
Mean daily daylight hours9h 1m10h 18m11h 55m13h 35m15h 0m15h 44m15h 22m14h 6m12h 30m10h 51m9h 23m8h 37m

Solar UV radiation in Bayan-Ulaan, Mongolia

Bayan-Ulaan experiences the highest level of ultraviolet (UV) radiation in April, May and August, when the maximum UV index can reach values of 10 - 10, which corresponds to the Very High category of sun exposure. January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Bayan-Ulaan UV Index data.

Average daily maximum UV levels by month for Bayan-Ulaan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)23610101010107532