CLIMATE


 
The Danube Delta is a part of the semiarid temperate climate zone common for the pontic prairie .Very large and plane aquatic area, covered with vegetation interrupted by the sand islands of the marine fields, make an active surface characteristic  Danube’s and adjacent lagoons, totally different  from the pontic prairie. Winter days are soft (when north-east European baric center is active) ,and cold ,with strong winds (when North-West Atlantic cyclones are acting),while the summer days are cold and dry (when tropical- Atlantic anti-cyclones are in action  and rainy (when the Mediterranean basin’s air interact with the cold one from North-West of Europe).Medium annual temperatures indicate rising from West to East , being around  11˚C.Juli’s medium temperature is  +22,5 ˚C while the one of January is -0,5˚C(on the sea shore area) and -1,8˚(on the continental are of the lagoon)

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The winds regime is dominated by the winds from the Nordic sector (35%) followed by the ones from south-Eastern and Western area. By seasons, winds from North are more frequent in the winter and autumn, and the ones from South and West in the summer and in the spring. The biggest frequency can by register in the spring (in March), and the calmest season is summer (August). Generally it can be seen that the calm period rises from the sea shore towards continental area.  Therefore at Gura Portitei the calm season represents only 5% and at Tulcea 34, 4%.

The rain season. Although it seems paradoxical the Danube Delta is the area with the littlest annual quantities of precipitation from all contry. At the entrance in Danube Delta (Jurilovca) it can be registered precipitation a medium multiannual acuity under 400 mm ,and on the danubian shore and the most of lagoons under 350 mm.
The snow level is low and remains only for short periods of time .The medium annual number of days with snow is 16,2 at Babadag and of 11 at Gura Portitei .The air ‘s humidity presents high values ,because the sea’s influence and of the strong evaporation that takes place in Danube conditions. The annual media of humidity is about 76%.


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The nebulosity presents values that are lower than in the rest of the country the Danube being the region with the longest sunny period of the year. The total length of insulation surpasses 2.200 hours annually, which means that it is with about 100 hours longer than the isolation’s length in Campia Romana .The cloudiest month is December and the sunniest is August.


The seasons are unvarying distributed in the Danube Delta. At the entrance in Danube, at Tulcea, 90 years long average shows that there are 142 days of summer and 60 days of winter, while spring last at long as autumn does. At Sulina the same multi-annual average show 145 days of summer and 15 days of winter and the spring are longer (122 days) than autumn (83 days).


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