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I thought this one would be an easy one for Istanbul , but Istanbul is colder than I thought -my town at the same latitude, has a warmer annual average maximum, which I didn't expect at sea level in Europe.
Istanbul does have very nice summers, but also cool winters with quite low sunshine. It is also 100 hours sunnier than Wellington, which is in it's favour.
Wellington has a much worse summer, but nicer winter. It can get some diabolical weather at times, but it's warmer lows would mean a better range of tender plants
On balance, I will choose Wellington.... by a whisker.
Not for the first time, I will provide some corrections to the outdated Wiki. data. 30-year mean sunshine is 2113 hours. 30-year temp mean is 13.8C at sea level, not 12.7C (Kelburn site at 126m ASL has 30-year mean of 12.9C). Rainfall average is correct.
Tmin even at Kelburn hasn't dropped to 0C since July 1965.
I would say Wellington because the temperature is very comfortable all year round and it's never hot there. (The all time record is 86F and 30C) Istanbul has the possibility of some very high temperatures.
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