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Great Britain and surrounding islands are textbook examples of continental islands though, being on the Eurasian continental plate and only being separated from the mainland by a small amount of sea, so it doesn't really matter whether two small areas of Scotland might barely scrape into Koppen's "continental" category.
The question was really about islands far from continents and their influence.
Wow, Sable Island does have pretty extreme seasonal variation, considering it doesn't look much more than a strip of sand in the Atlantic!
In the summer the Gulf Stream mixes north toward Sable Island giving it water temps around 21C/70F. So summers there are fairly warm and humid. In the winter it gets ice cold water moving down from the Labrador Current. Right now the water temp off Sable Island is 2C. It also gets very cold continental air flowing down off Newfoundland and Labrador.
It's an interesting climate because polar air masses can easily sink over it, but it can also get very mild (above 50F/10C) weather for days at a time in the middle of January if airflow is up off the Gulf Stream, which is never that far away.
Technically I believe it's a hardiness zone 7b or 8a, which makes it the mildest in Canada aside from the Pacific coast. Theoretically Trachycarpus fortunei palms could survive there, although the wind, salt spray and lack of good soil render it totally treeless.
I assume this site models climate stats from nearby stations based on altitude etc?
In the case of my area, they've just shrunk diurnal ranges, giving warmer minimums and cooler maximums.
Altitude and distance inland don't show any consistency either -possibly they've attempted to link temperature to rainfall, although rainfall is accurate either.
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