Dont forget most of our local live is used to water that doesn't change water temperature that much between summer and winter. Yes of course when you are looking at shallow bays etc the water will warm up but as that water warms in the summer you'll find less and less life there. As a former dive instructor I've been on the sunshine coast in the middle of the summer when the water temp was close to 80F but there was no life to speak of, go below the thermocline at about 35ft and a temp drop of close to 35F and all the sudden there was a lot more life. Our local water sits with in 2-3 degrees of it's summer high and it's winter low for the most part.
Doug
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