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Monthly climate in Bayan, Mongolia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Bayan features a subarctic climate (Dwc). Temperatures typically range between -21 °C (-6 °F) and 19 °C (67 °F) through the year, but rarely can drop to -42 °C (-43 °F) or can rise to as high as 35 °C (94 °F). The average annual precipitation amounts to about 394 mm (15.5 inches) and receives 60 rainy days on the 1 mm (0.04 inches) threshold annually. Bayan enjoys an average of 3630 hours of sunshine throughout the year, and daylight varies from 8 hours 21 minutes to 16 hours 2 minutes per day.

Monthly average temperatures in Bayan, Mongolia

The warmest months in Bayan are June, July and August, with daily mean temperatures ranging from 16 to 19 °C (61 - 67 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -21 to -18 °C (-6 - 0 °F) throughout the day. On average each year, Bayan experiences 32 days above 25 °C (77.0 °F) and 199 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. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum-1°C
(30°F)		4°C
(39°F)		20°C
(68°F)		28°C
(83°F)		34°C
(93°F)		35°C
(94°F)		34°C
(93°F)		31°C
(87°F)		30°C
(86°F)		24°C
(76°F)		11°C
(51°F)		1°C
(34°F)
Mean maximum-7°C
(20°F)		-1°C
(31°F)		14°C
(58°F)		24°C
(76°F)		30°C
(86°F)		31°C
(88°F)		32°C
(89°F)		28°C
(82°F)		26°C
(79°F)		18°C
(65°F)		9°C
(48°F)		-4°C
(26°F)
Average high-15°C
(5°F)		-10°C
(14°F)		2°C
(36°F)		11°C
(52°F)		18°C
(64°F)		23°C
(74°F)		25°C
(77°F)		21°C
(71°F)		18°C
(64°F)		8°C
(47°F)		-4°C
(25°F)		-13°C
(9°F)
Daily mean-21°C
(-6°F)		-18°C
(0°F)		-5°C
(23°F)		4°C
(39°F)		11°C
(52°F)		17°C
(63°F)		19°C
(67°F)		16°C
(61°F)		11°C
(52°F)		1°C
(33°F)		-10°C
(14°F)		-19°C
(-1°F)
Average low-27°C
(-16°F)		-25°C
(-13°F)		-12°C
(10°F)		-4°C
(26°F)		3°C
(37°F)		10°C
(51°F)		14°C
(57°F)		11°C
(53°F)		5°C
(41°F)		-5°C
(23°F)		-15°C
(5°F)		-23°C
(-10°F)
Mean minimum-34°C
(-29°F)		-34°C
(-29°F)		-23°C
(-9°F)		-11°C
(13°F)		-4°C
(24°F)		3°C
(38°F)		8°C
(47°F)		5°C
(41°F)		-3°C
(27°F)		-11°C
(13°F)		-27°C
(-16°F)		-32°C
(-25°F)
Minimum-39°C
(-38°F)		-41°C
(-42°F)		-28°C
(-19°F)		-12°C
(10°F)		-6°C
(22°F)		0°C
(33°F)		5°C
(41°F)		-1°C
(31°F)		-6°C
(21°F)		-12°C
(10°F)		-38°C
(-37°F)		-42°C
(-43°F)

Compare climate in Bayan with other places

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

Monthly average precipitation in Bayan, Mongolia

Bayan usually has the most precipitation in June, July and August, with an average of 11 rainy days and 86 mm (3.4 inches) of precipitation per month. The driest months in Bayan are January, February and December. On average, 4 mm (0.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Bayan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)2 (0.1)5 (0.2)6 (0.2)15 (0.6)34 (1.4)62 (2.4)112 (4.4)84 (3.3)43 (1.7)20 (0.8)7 (0.3)4 (0.1)
Average precipitation days (≥ 1 mm)011351014118421

Monthly sunshine hours in Bayan, Mongolia

The sunniest months in Bayan are May, June and July, when the sun shines an average of 11 hours 48 minutes a day. Least sunny months in Bayan: January, November and December receive an average of 7 hours 43 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Bayan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours204266319325365363358333301285257248
Mean daily daylight hours8h 47m10h 10m11h 54m13h 41m15h 14m16h 2m15h 37m14h 15m12h 32m10h 46m9h 11m8h 21m

Solar UV radiation in Bayan, Mongolia

Bayan experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 8 - 9, 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 UV Index data.

Average daily maximum UV levels by month for Bayan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)235789986431