Mongolia in January

−20 to −30 °C and the worst smog of the year in Ulaanbaatar; city museums only.

• Ulaanbaatar and the centre · Ulaanbaatar, Terelj, Kharkhorin, Orkhon valleysmoke haze

  Coldest capital in the world: January averages about −20 °C. Coal and ger-stove smoke make winter air among the worst anywhere Nov–Feb. Summer is 20–28 °C by day with afternoon showers in July–August.

• Gobi · Dalanzadgad, Khongoryn Els, Bayanzag, Yolyn Amcool

  Summer days reach 35–40 °C, nights stay cool; spring (Apr–May) brings wind and dust storms. September is the easy month.

• Khövsgöl and the north · Mörön, Khatgal, Darkhad valleycool

  Lake Khövsgöl stays frozen until late May or June; summer nights near freezing at 1,650 m. Ice Festival in early March.

• Western Altai · Ölgii, Khovd, Tavan Bogd, Uvscool

  High mountains with snow possible any month; the Golden Eagle Festival in early October is the last good week before the cold.

Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.

• New Year

  1 Jan

  Offices close for a day; hotels in Ulaanbaatar hold parties.

• Tsagaan Sar (Lunar New Year) big impact

  Feb 2027 (lunar, moves yearly — check)

  Three official days, but many shops and restaurants close for a week; families visit elders, transport out of the city is packed.

Crowds · Mongolia

Low

Prices · Mongolia

Low

• Layers: a fleece or light jacket

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Better another month

• Ulaanbaatar

  −20 to −30 °C, smog; Tsagaan Sar closures some years.