The climate is temperate-continental. It is influenced to a greater extent by the Black Sea, and the air stream coming from the Mediterranean.
The characteristic features of the temperature are:
- January average temperature: -2oС;
- July average temperature: 23.1оС;
- annual average temperature: 12.3оС
The predominant winds are northwestern - 24%. The average speed of the predominant winds is about twice as big as the average for the country. That is why the wind, especially the one blowing during the cold period of the year is a serious hinder for the complete use of the coastline for recreational purposes during the whole year. During the hot period of six months (April-August) the predominant eastern winds are connected with the sea breeze blowing in the day. The night breeze coming from the west also blows from time to time. It is 2-3 times slower (1-2 meters per second). The winter winds are northwestern, and the summer ones are southeastern.
The clouds are closely connected with the circulation of the atmosphere, which on the Bulgarian coastline reaches its peak in the winter. That is why the maximum of the clouds is then. During the period February-November it is 0.7 on the average. It gradually reduces its quantity in the spring, and in the summer it is minimal from 2.6 to 2.8 on the average. In October the quantity increases. The average annual number of sunny days is 82, with maximum in the summer - 15 days a month, and minimum in the winter (February) - 2.7.
The proximity of the water favours the evaporation and the humidity of the air throughout the whole year. The average number of dry days in the summer and autumn is 17-28, and in the winter and spring - 14-15. The months July, August, and September are often dry because the precipitation are insufficient.
A very important element for the region is the sunshine. Its actual duration is 2100-2200 hours per year. The maximum duration is in July and August, and even in May two thirds of the time between 9-10 and 14-15 is sunny.
The seaside of the Black Sea is very close to the south border of the ultraviolet comfort. If certain conditions are present, it presents real possibilities for heliotherapy (from March to October), and optimal possibilities from April to September. From June to August the ultraviolet rays are in excess.
According to the chemical structure and physiological effect they possess, the sea waters are related to the chloro-sodium and the bitter sulphur-magnesium waters. According to the concentration of salt (up to 18 grams per litre), the water of the Black Sea is not very salty. The largest percent of the salts present is given to the sodium chloride - 75%, followed by the salts of the magnesium, sulphate, calcium, and carbonate. The sea water has a recreational effect
Bulgarian Nashanal parks