Ben, the idea is a good one. Is it perfect? Probably not. But most fisherman would want to know real time water temperatures so they can decide if they will fish the James, White, Kings, long creek, etc. The enhancement for me would be the water temperatures on the various parts of the lake coupled with the lake level on a running log so I can see where it was on the 1st day of the month and every day since then for the month. I can compare that with various daily weather feeds to determine the various stages the fish might be in when I can go fishing. It is a very good idea.
The wolf river in Wisconsin has underwater cameras strategically placed so fisherman can tell when the white bass are running. People get used to it and head there when the video shows the movement.
Your temerature idea from various parts of the lake is one that is worthwhile.
Mike