CLIMATE

Delta falls in the area with temperate semiarid steppe Pontic specific. Flat water and very large spaces covered with vegetation to varying degrees, interrupted by islands marine sandy fields, comprise a specific active area of the delta and adjacent lagoons, quite different from the Pontic steppe. 

It reacts to the active surface total radiation received and the general circulation of the atmosphere resulting in a mosaic of microclimates. Total radiation varies between a minimum of 3.5 Kcal / cmp recorded in winter and a maximum of 17 Kcl. / cmp, in July. Depending on the intensity of activity centers to install the main barrel specific weather conditions: mild winter days (when the active center of north-eastern European barrel), cold winter days with strong winds (when acting anticiclonii North Atlantic), summer days hot and dry (when acting North Atlantic cyclones), rainy summer days (when the Mediterranean air interacts with the cold north-west Europe). 

Duration of sunshine is high, the multiannual average is 2250 hours, but can get to 2600 during the nebulosity. The temperature is distributed unevenly on the surface of the delta. 
Multi-media show temperature increases from west to east. At the tip of the Delta (Tulcea) average annual temperatures of 10.94 C is the river delta (Gorgova) of 10.96 C, on the seashore (Sulina) of 11.05 C and the Black Sea (Platform Gloria) of 11.86 C.

Average daily high amplitudes reflect differences due to the nature of the active area: the Gorgova varies between a maximum of 9 C (July) and a minimum of 3.8 C (in December), from Sulina between 2.8 C (July) and a , 4 C (in november) and Gloria station between 2.3 C (July) and one C (in December and February). Sums actual annual average daily temperature viscosity approaching 1600 C. Biggest air humidity rates in Romania. The humidity in winter varies between 88 - 84% to 85% and 89 Gorgova Sulina and St. George, and in summer, between 69-71% at Gorgova and 77-80% at Sulina and Saint Gheorghe. Rainfall is low in quantity and decrease from west to east because of the effect of specific surface active delta and the Black Sea. On entering the Danube Delta (Tulcea) multianula is registered an average rainfall of 450 mm, and at Sulina, 360mm. In the biggest part of the Delta fall between 350 and 400 mm rain, and the delta coast and most of the lagoons, less than 350 mm.

The snow is thin and short periods of time, only in severe situations.Such winters situations were spent in the years 1928-1929, 1953-1954, 1941-1942, 1984-1985, near the shore when the sea froze for 45-60 days. The dominant winds blow from the northern sector alternative to the southern sector, the most intense wind acceleration occurring in the winter and transition seasons. Seasons are very unevenly distributed in the Danube Delta Area. On entering the delta, Tulcea, averages 90 years reveals that there are 142 days of summer and 60 winter days and the springs were almost equal during autumns. At the same average annual Sulina show 145 days of summer and only 15 days in winter, and springs are longer (122 days) than the autumns (83 days).

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