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Vitosha is the most visited Bulgarian mountain. It rises immediately above Sofia and is one of the symbols of our capital city. Few are the big cities in the world, and capitals are even fewer, that possess such a natural advantage.
Vitosha Mountain is the most significant part of the Plana-Zavala Mountain System. With its highest peak – Mt. Cherni Vrah (The Black Peak) (2290 m) it occupies the fourth place among Bulgarian mountains.
Since 1935 a meteorological station has been operating on Mt. Cherni Vrah, with many services, mostly in the chalets. Comparative data about Sofia and Mt. Cherni Vrah weather conditions: the average monthly and annual temperature - for the coldest month - January - in Sofia is 1.7°C below zero and on Mt. Cherni Vrah - 8.3°C below zero. For the warmest month - July in Sofia - 21.2°C and for Mt. Cherni Vrah - August - 9.0°C. The average annual temperature in Sofia is 10.5°C and at Mt. Cherni Vrah - 0.3°C. A characteristic feature of Vitosha climate is the inversion (mostly in December and January). When Sofia is covered by thick fog and cold, the Vitosha Mountain shines in sun and warmth. This happens in an average of 15 days per year. An average of 140 days per year are very cold on Mt. Cherni Vrah - the maximum values in these days are below zero and there are 222 frosty days (when only the minimum temperatures are below zero). The winter in the high parts of the mountain lasts between 5 and 7 months, and truly summer months are only July and August. The average precipitation rate on Mt. Cherni Vrah (mostly snowfalls) is 1178 litres per sq. m. and June is the most rainy month - 142l per sq. m., while September has the lowest precipitation figure - 71 litres per sq. m. Most thick snow coverage is formed in March. Mt. Cherni Vrah is quite inhospitable, having an average of 250 foggy days in the year and only 50 clear ones and it is one of most windy peaks in Bulgaria. With an average wind speed of 9.3 m/s it occupies the second place among the monitored peaks after Mt. Mourgash in Stara Planina (10.3 m/s) and before Mt. Botev (9.1 m/s) and Mt. Mussala (7.6 m/s). Only 7 per cent of the days on Mt. Cherni Vrah are windless.