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Monthly climate in Altan, Mongolia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Altan features a subarctic climate (Dwc). Temperatures typically range between -21 °C (-6 °F) and 19 °C (66 °F) through the year, but rarely can drop to -41 °C (-42 °F) or can rise to as high as 32 °C (89 °F). The average annual precipitation amounts to about 184 mm (7.2 inches) and receives 36 rainy days on the 1 mm (0.04 inches) threshold annually. Altan enjoys an average of 3905 hours of sunshine throughout the year, and daylight varies from 8 hours 24 minutes to 15 hours 58 minutes per day.

Monthly average temperatures in Altan, Mongolia

The warmest months in Altan are June, July and August, with daily mean temperatures ranging from 16 to 19 °C (61 - 66 °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 - 1 °F) throughout the day. On average each year, Altan experiences 27 days above 25 °C (77.0 °F) and 196 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Altan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum-5°C
(23°F)		7°C
(44°F)		15°C
(59°F)		25°C
(77°F)		28°C
(82°F)		30°C
(86°F)		32°C
(89°F)		30°C
(86°F)		28°C
(82°F)		18°C
(64°F)		10°C
(50°F)		-3°C
(27°F)
Mean maximum-8°C
(19°F)		-1°C
(30°F)		9°C
(49°F)		20°C
(68°F)		26°C
(79°F)		28°C
(82°F)		29°C
(85°F)		27°C
(81°F)		24°C
(76°F)		14°C
(57°F)		6°C
(43°F)		-5°C
(23°F)
Average high-15°C
(5°F)		-10°C
(14°F)		-0°C
(32°F)		10°C
(50°F)		17°C
(62°F)		22°C
(73°F)		24°C
(75°F)		21°C
(70°F)		16°C
(61°F)		6°C
(43°F)		-5°C
(24°F)		-14°C
(7°F)
Daily mean-21°C
(-6°F)		-18°C
(1°F)		-7°C
(20°F)		4°C
(40°F)		11°C
(52°F)		17°C
(63°F)		19°C
(66°F)		16°C
(61°F)		10°C
(50°F)		-0°C
(32°F)		-10°C
(14°F)		-20°C
(-4°F)
Average low-27°C
(-16°F)		-24°C
(-11°F)		-14°C
(7°F)		-2°C
(29°F)		4°C
(40°F)		10°C
(51°F)		13°C
(55°F)		10°C
(51°F)		4°C
(39°F)		-5°C
(23°F)		-15°C
(5°F)		-25°C
(-13°F)
Mean minimum-35°C
(-32°F)		-33°C
(-27°F)		-26°C
(-15°F)		-11°C
(13°F)		-5°C
(22°F)		3°C
(38°F)		7°C
(44°F)		4°C
(39°F)		-5°C
(23°F)		-14°C
(7°F)		-26°C
(-14°F)		-34°C
(-29°F)
Minimum-41°C
(-42°F)		-41°C
(-42°F)		-29°C
(-21°F)		-16°C
(3°F)		-9°C
(15°F)		0°C
(33°F)		5°C
(42°F)		1°C
(34°F)		-8°C
(17°F)		-17°C
(2°F)		-29°C
(-20°F)		-39°C
(-38°F)

Compare climate in Altan with other places

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

Monthly average precipitation in Altan, Mongolia

Altan usually has the most precipitation in June, July and August, with an average of 6 rainy days and 37 mm (1.5 inches) of precipitation per month. The driest months in Altan are January, February and December. On average, 3 mm (0.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Altan. 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)11 (0.4)12 (0.5)21 (0.8)48 (1.9)43 (1.7)15 (0.6)12 (0.5)6 (0.2)4 (0.1)
Average precipitation days (≥ 1 mm)011234884311

Monthly sunshine hours in Altan, Mongolia

The sunniest months in Altan are May, June and July, when the sun shines an average of 12 hours 54 minutes a day. Least sunny months in Altan: January, November and December receive an average of 7 hours 47 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Altan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours203268341357393390403372340319266248
Mean daily daylight hours8h 50m10h 12m11h 55m13h 40m15h 11m15h 58m15h 34m14h 13m12h 32m10h 47m9h 14m8h 24m

Solar UV radiation in Altan, Mongolia

Altan experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High category of sun exposure. January, November and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 2. For more detailed information, check out our hourly Altan UV Index data.

Average daily maximum UV levels by month for Altan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)23571010997521