The Geography of Istanbul
Istanbul is the most special cities in the world due to its position as a bridge between Europe and Asia
To the south of Istanbul lays the Marmara Sea, and to its north the Black Sea. The Western part of the city is in Europe, and the Eastern is in Asia. This geographical location gives characteristics of east and west to the city at the same time. The watercourse that divides Istanbul is the Bosphorus.
Istanbul is so huge area, that you can experience several different sub-climates in the same city because of its stayed between north Black Sea part and south Marmara Sea part.
Generally, summer months are warm and humid with little rain especially between July-August, winter months cold and sometimes snowy but not that much as other areas of Turkey. Spring and autumn are soft and this would be the best time for visitors.