This article is from the Mongolia FAQ, by Oliver Corff with numerous contributions by others.
Summer is beautiful but short. Winter is not recommended if you go
beyond Ulaanbaatar. Living conditions and road conditions are at least
uncomfortable, nutrition and all related resources become too scarce.
Storms in winter are especially dangerous for hikers outdoors, and
even a short sightseeing trip in the close vicinity of Ulaanbaatar,
like Zuun Mod with its famous monastery Manjshiriïn Xiïd, might yield
one or the other frost bite.
A good start is in May. It is still cold but the overwhelming beauty
of spring, the mild fragrance of blossoms and the fresh smell of water
offer experiences which one will never forget.
 
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