Danube Delta climate

Danube Delta area falls within the semiarid temperate steppe Pontic specific. Flat water and very large spaces, covered in varying degrees of vegetation, interrupted by fields of marine sandy islands, forming an active area of ​​the Delta area and the adjacent lagoons, quite different from the Pontic steppe.

This active area responds to the 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 the winter months 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 anticiclonii tropical Atlantic), rainy summer days (when the Mediterranean air interacts with the cold north-west Europe).

Duration of sunshine is high, the annual average is 2250 hours, but can reach 2600 hours in low nebulosity years. The temperature is distributed unevenly on the surface of the delta. Multi-media show the temperature increase from west to east. At the tip of the Delta (Tulcea) annual average temperature is 10.94 C in 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 active surface: the Gorgova varies between a maximum of 9 C (July) and a minimum of 3.8 C (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). The annual average daily temperature viscosity of the actual close of 1600 C. The air humidity recorded the highest rates in Romania. Relative air 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 and quantity decrease from west to east due to the effect of specific surface active delta and the Black Sea. On entering the Danube Delta (Tulcea) recorded an average yearly rainfall of 450 mm, and at Sulina, 360 mm. For the most part of the Delta fall between 350 and 400 mm rain, and the delta coast and most of the lagoons, less than 350 mm.

Snow layer is thin and short periods of time, only more severe winters. Such situations have occurred in the years 1928-1929, 1953-1954, 1941-1942, 1984-1985, when the sea shore near 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 winter and transitional seasons. Seasons are very unevenly distributed in the Delta area. On entering the delta, Tulcea, averages 90 years reveals that there are 142 days of summer and 60 winter days and took nearly egaăa springs with autumns. At the same average annual Sulina show 145 days of summer and winter only 15 days, and springs are longer (122 days) than the autumns (83 days).