For a couple decades our oceans, lakes and streams have been warming. Puget Sound has been warming also. During just the last 14 years, the temperature of Puget Sound has increased an average of nearly 10 degrees. There are many reasons why this is happening. Increasing population causing increasing pollution, global warming, and much more.
During the winter months the water temperature does drop a bit. My dive computer records temperatures fairly accurately. This winter I've noticed the temps have dropped to about 50 degrees. This is good in that this helps the wildlife, but be certain, the temps will increase this summer to extreme temps once again.