Snow falls often from November to April. At Sofia it snows on a mean 42*2 days within the 12 months, at Philippopolis 14*eight, at Bourgas 12*eight
As regards moisture and clouds, Bulgaria is midway between the Mediterranean area and Central Europe. The typical density of cloud through the 12 months varies from 5 (at Philippopolis) to five*5 (at Gabrovo). The month of November is the cloudiest (7*9 at Sofia). August is the clearest (2*6 at Bourgas). The typical moisture varies from 70 per cent, (at Gabrovo) to 79p.c. (at Bourgas). It diminishes in summer time to 58p.c., and rises to 66p.c. in December. The atmospheric strain reaches its most in summer time at Philippopolis (13*three) and its minimal in January at Gabrovo (three*four).
VEGETATION
On this respect additionally Bulgaria holds a center place between the forests of Central Europe, the steppes of Russia, and the Mediterranean districts. The mountains are coated with forests much like these of Central Europe. Sure areas of the Danube remind one of many Russian steppes, and Southern Bulgaria produces crops belonging to the international locations of the south of Europe.
Bulgaria was previously, because the memoirs of assorted travellers testify, very wealthy in forests. Sadly an ideal a part of them have perished in consequence of reckless consumption and prospecting for minerals. What nonetheless stays is within the mountains at a distance from cities and the principal arteries of communication.
The forests of the plains are composed
The forests of the plains are composed mainly of oaks (quercus) of all species. Above 500 metres altitude is discovered the beech (Fagus silvatica), the most common and most essential tree of our mountains. In a large center zone, the oak and the beech develop collectively, the previous protecting the decrease slopes, the latter the higher slopes. The evergreen oak grows at altitudes exceeding 1,000 metres. Decrease down, with the oak and beech are mingled the hornbeam (Caprinus duincnsis), the elm (Alnus glutinosa) the aircraft (Acer pseudoplatanus) and others. Above the beech, within the Rhodopes, and in addition on the Rilo, lengthen often forests of conifers, with the fir (Abies pectinate and Picea excelsa), the pine (Pinus silvestris and Pinus laricio), the Juniperus nana. The beech has in a number of locations pushed out the conifers, which are actually not often to be discovered within the StaraPlanina and within the Ossogovo. Within the fields, in addition to on the slopes of the decrease hills, are discovered, as a substitute of forests, shrubs, brambles and thorns of all types. Essentially the most attribute are the groves of lilacs (Syringa vulgaris).