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| Istanbul, Turkey Weather - Annual trend, Monthly average range of temperature and Precipitation data |
Istanbul, historically known as Byzantium and Constantinople, is the largest city of Turkey
Istanbul has a Mediterranean climate according to the Köppen climate classification system.
In summer the weather in Istanbul is hot and humid, summers are relatively dry, but rainfall is significant during that season. Extreme heat, however, is uncommon.
During winter it is cold, wet and often snowy, snowfalls tend to be heavy.
Spring and autumn are mild, but are unpredictable and often wet, and can range from chilly to warm, however the nights are chilly.
Istanbul has a persistently high humidity, which can exacerbate the moderate summer heat. The humidity is especially salient during the morning hours, when humidity generally reaches eighty percent and fog is very common. The city receives fog an average of 228 days each year, with the highest concentration of foggy days being in the winter months, although it usually dissipates by noontime.
Thunderstorms are uncommon, occurring just 23 days each year, but they occur most frequently in the summer and early autumn months.
Istanbul also tends to be a windy city, having an average wind speed of 18 km/h (11 mph).
