Ocean reaches temperate conditions

It always happens like this. It is freezing. Limb numbing freezing. I swim on the verge of early stages hypothermia donning 2 caps and a hoodie. And then all of a sudden it is gorgeous. This happened Monday. The first 6 inches all of a sudden felt good, comfortable, dare I say warm-ish. Below that of course was still a bit chilly but I hardly reached that depth anyways.

Buoy 44007 is reading 63. It is definitely not that warm at Crescent Beach.
Buoy CASM1 is reading 59. That sounds more likely.
But how can it be 4 degrees warmer out in the middle of the bay compared to right on Portland Harbor? Is there an oceanographer out there to explain?

It has also reached sweltering temperatures in Maine this week the likes of which I don't remember since 2002. 95 degrees.

Here's a refresher. Put it all in a blender.
1 cup cold green tea
1/2 cup 100% fruit juice
1/2 frozen banana
2 T coconut
1/2 c. pineapple chunks
1 T yogurt
1/2 scoop protein powder