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Monthly climate in Onon, Mongolia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Onon features a subarctic climate (Dwc). Temperatures typically range between -22 °C (-7 °F) and 19 °C (66 °F) through the year, but rarely can drop to -43 °C (-46 °F) or can rise to as high as 35 °C (94 °F). The average annual precipitation amounts to about 420 mm (16.5 inches) and receives 62 rainy days on the 1 mm (0.04 inches) threshold annually. Onon enjoys an average of 3647 hours of sunshine throughout the year, and daylight varies from 8 hours 20 minutes to 16 hours 3 minutes per day.

Monthly average temperatures in Onon, Mongolia

The warmest months in Onon 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 -22 to -18 °C (-7 - 0 °F) throughout the day. On average each year, Onon experiences 30 days above 25 °C (77.0 °F) and 203 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Onon. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum-1°C
(30°F)		6°C
(42°F)		19°C
(67°F)		28°C
(82°F)		34°C
(93°F)		34°C
(94°F)		35°C
(94°F)		30°C
(87°F)		29°C
(84°F)		24°C
(75°F)		11°C
(52°F)		2°C
(36°F)
Mean maximum-7°C
(20°F)		0°C
(33°F)		14°C
(57°F)		24°C
(75°F)		30°C
(86°F)		30°C
(87°F)		31°C
(88°F)		27°C
(81°F)		25°C
(78°F)		18°C
(64°F)		9°C
(48°F)		-3°C
(26°F)
Average high-15°C
(6°F)		-10°C
(15°F)		2°C
(36°F)		11°C
(52°F)		17°C
(64°F)		23°C
(74°F)		24°C
(76°F)		21°C
(71°F)		17°C
(64°F)		8°C
(46°F)		-4°C
(26°F)		-13°C
(9°F)
Daily mean-22°C
(-7°F)		-18°C
(-0°F)		-6°C
(22°F)		4°C
(39°F)		10°C
(51°F)		17°C
(63°F)		19°C
(66°F)		16°C
(61°F)		10°C
(51°F)		0°C
(33°F)		-10°C
(14°F)		-19°C
(-2°F)
Average low-28°C
(-18°F)		-26°C
(-14°F)		-13°C
(9°F)		-4°C
(25°F)		2°C
(36°F)		10°C
(50°F)		13°C
(56°F)		11°C
(52°F)		4°C
(39°F)		-5°C
(22°F)		-16°C
(4°F)		-24°C
(-11°F)
Mean minimum-35°C
(-30°F)		-34°C
(-29°F)		-24°C
(-11°F)		-11°C
(13°F)		-5°C
(24°F)		2°C
(36°F)		7°C
(45°F)		4°C
(39°F)		-4°C
(25°F)		-11°C
(12°F)		-28°C
(-17°F)		-32°C
(-25°F)
Minimum-40°C
(-40°F)		-43°C
(-46°F)		-32°C
(-25°F)		-13°C
(10°F)		-6°C
(21°F)		-1°C
(31°F)		4°C
(39°F)		-1°C
(31°F)		-6°C
(21°F)		-13°C
(9°F)		-41°C
(-41°F)		-43°C
(-45°F)

Compare climate in Onon with other places

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

Monthly average precipitation in Onon, Mongolia

Onon usually has the most precipitation in June, July and August, with an average of 12 rainy days and 94 mm (3.7 inches) of precipitation per month. The driest months in Onon 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 Onon. 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)16 (0.6)35 (1.4)71 (2.8)118 (4.6)95 (3.7)42 (1.6)20 (0.8)7 (0.3)4 (0.1)
Average precipitation days (≥ 1 mm)011371014128411

Monthly sunshine hours in Onon, Mongolia

The sunniest months in Onon are May, June and July, when the sun shines an average of 11 hours 55 minutes a day. Least sunny months in Onon: 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 Onon. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours205266320327371367358338301286257247
Mean daily daylight hours8h 46m10h 10m11h 54m13h 42m15h 15m16h 3m15h 38m14h 16m12h 32m10h 46m9h 11m8h 20m

Solar UV radiation in Onon, Mongolia

Onon 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 Onon UV Index data.

Average daily maximum UV levels by month for Onon. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)235689987431