Ulan Bator, Mongolia climate

BSk Cold semi-arid

Ulan Bator has a strongly seasonal subarctic climate (Cold semi-arid, Köppen BSk). The hottest month is July with an average daily high near 25°C, while the coldest is January averaging around −30°C at night. Precipitation totals about 199 mm a year and is strongly seasonal — July alone averages 54 mm while February barely receives 2 mm.

☀️ Summers

Mild

Highs near 25°C in July.

❄️ Winters

Bitterly cold

Lows near −30°C in January.

🌧️ Rain

Very dry

About 199 mm of rain a year.

Wettest in July

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

Ulan Bator climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	−16	−10	0	10	17	23	25	23	17	8	−5	−14
Avg temp (°C)	−23	−18	−8	2	9	16	18	16	9	0	−12	−21
Avg low (°C)	−30	−27	−16	−6	1	8	12	9	1	−8	−20	−28
Precipitation (mm)	2	2	5	9	18	35	54	41	17	7	6	3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	−16	−10	0	10	17	23
Avg temp (°C)	−23	−18	−8	2	9	16
Avg low (°C)	−30	−27	−16	−6	1	8
Precipitation (mm)	2	2	5	9	18	35

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	25	23	17	8	−5	−14
Avg temp (°C)	18	16	9	0	−12	−21
Avg low (°C)	12	9	1	−8	−20	−28
Precipitation (mm)	54	41	17	7	6	3

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	41	46	52	57	60	66	66	60	52	49	50	50
Relative humidity (%)	90	85	69	53	50	53	59	63	61	66	80	89
Wind speed (mph)	5.2	5.8	6.9	8.2	7.9	6.2	5.3	5.2	5.8	5.9	5.8	5.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	41	46	52	57	60	66
Relative humidity (%)	90	85	69	53	50	53
Wind speed (mph)	5.2	5.8	6.9	8.2	7.9	6.2

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	66	60	52	49	50	50
Relative humidity (%)	59	63	61	66	80	89
Wind speed (mph)	5.3	5.2	5.8	5.9	5.8	5.4

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Chinggis Khaan Intl / Buyant Ukhaa Intl, a weather station, about 11 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →