A buddy introduced me to perch fishing years ago on a cold February day at Lake Monticello. We were fishing on the bottom at a submerged island 35' deep, surrounded by 40-55 FOW. He had picked today because it was forecast to be cloudy, which he said was crucial for perch fishing. We caught fish steadily until about 11 and the sun came out. He said that would kill the bite, and sure enough it did. Now understanding how sun or clouds affect fish that are hugging the bottom in 35 FOW is beyond me, but it apparently made a difference.