One might think that Istanbul always has a warm climate, hot in summer and pleasant temperatures in winter.
I myself have visited the city several times now and found that it has everything from snow to extreme heat that the weather god has to offer.
This photo was taken in March this year. On all days it was very hazy there. Istanbul has put on a gray coat. The smoke from the diesel engines of the ferries crossing the Bosphorus fits very well into the picture.
In any case, Istanbul is always worth a trip, no matter what the weather!