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The other boroughs are islands but I think it is a stretch to say they are in the Atlantic.
I wouldn't say it's a stretch, they are in the Atlantic, and the surrounding water influences the climate, just look at the average first freeze dates at KNYC/LGA/JFK vs Newark (which is also in NYC's heat island).
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NYC has that many days due to a massive heat island, otherwise using JFK airport near the ocean they only average 22.
JFK is in the heat island as well, but it's more exposed to the Atlantic (its ASOS is feet from the water) which is why it has a lower amount of 30C days, it averages 26 though (not 22). And the heat island plays more of a role at night than it does in the day, so I don't think NYC's numbers are that high because of the heat island.
I can't believe that the hottest places in BC is so much further north than the Washington border. What's up with that?
I think it's because the local geography of the area amplifies the heat in the summer. It is on the other side of the Cascade range in a valley and so gets descending warm air kind of like a Foehn effect.
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