Bayanhongor, Mongolia climate

BWk Cold desert

Bayanhongor has a strongly seasonal subarctic climate (Cold desert, Köppen BWk). The hottest month is July with an average daily high near 25°C, while the coldest is January averaging around −24°C at night. Precipitation totals about 136 mm a year and is strongly seasonal — July alone averages 34 mm while January barely receives 2 mm.

☀️ Summers

Mild

Highs near 25°C in July.

❄️ Winters

Bitterly cold

Lows near −24°C in January.

🌧️ Rain

Very dry

About 136 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)

Bayanhongor climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	−11	−6	1	10	17	23	25	23	17	8	−2	−10
Avg temp (°C)	−18	−14	−6	3	9	16	18	16	10	1	−9	−16
Avg low (°C)	−24	−21	−13	−4	2	8	12	9	3	−6	−15	−21
Precipitation (mm)	2	2	3	5	12	28	34	30	11	4	2	2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	−11	−6	1	10	17	23
Avg temp (°C)	−18	−14	−6	3	9	16
Avg low (°C)	−24	−21	−13	−4	2	8
Precipitation (mm)	2	2	3	5	12	28

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	25	23	17	8	−2	−10
Avg temp (°C)	18	16	10	1	−9	−16
Avg low (°C)	12	9	3	−6	−15	−21
Precipitation (mm)	34	30	11	4	2	2

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	37	42	55	60	62	67	67	60	51	46	43	41
Relative humidity (%)	70	62	47	37	35	40	46	48	45	49	61	69
Wind speed (m/s)	1.7	2.1	2.7	3.2	3.4	2.9	2.6	2.4	2.4	2.2	2.0	1.7

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	37	42	55	60	62	67
Relative humidity (%)	70	62	47	37	35	40
Wind speed (m/s)	1.7	2.1	2.7	3.2	3.4	2.9

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	67	60	51	46	43	41
Relative humidity (%)	46	48	45	49	61	69
Wind speed (m/s)	2.6	2.4	2.4	2.2	2.0	1.7

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Bayanhongor, a weather station, about 7 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 →