It depends on what you are seeking for. If you are an adventure-seeker with a love of fascinating outdoors, Mongolia has a plenty to offer throughout the year. Winters are long and cold, and average temperatures over most of the country are below freezing from November through March and close to it in April and October. Winter days are mainly – 25 °C (-13 °F) but sometimes can drop to −35 °C (−34 °F) in most years. Even in this freezing weather Mongolia offers a great number of activities as dog and horse sledding, ice festival, camel festival and most interestingly eagle festival.
Warm summer days are around 20 °C, but extremes reach as high as 40 °C (104 °F) in the Great Gobi area and 33 °C (91.4 °F) in Ulaanbaatar. The warm summer lasts from May to September with an average daily temperature of 20°C. During this short period of time Mongolia displays its beauty of nature and attracts many tourists. Tourism peaks in July and August, most companies are fully booked and prices are higher, so booking in advance is advisable..There are also many festivals held throughout the year such as the ‘three manly sports’ of Naadam Festival (archery, horse racing and wrestling) in July, the Thousand Camel Festival (Camel race and polo) in March, Khuvsgul Ice Festival (horse sled) in March and Golden Eagle Festival (Eagle hunting) in late September, and there are plenty of opportunities for visitors to experience these and other aspects of Mongolian culture.