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For sure after 10 am and before 2 pm. I have caught deep water pikes like around 4am and around 8 pm... Not sure what these fish were doing 30-40' deep at these times. They bit, and, fight on...
I will say that a light wet snowfall always triggers something in little spurts, and heavy snowfall and windy are the days i just forget about going, the hundred times ive sat out in that crap usually ended in a skunking, like an idiot i still will fish them type days though not as much as a used to and sometimes beggars cant be choosers
Try following the lunar table if you don't already. The other day we only caught one fish all day, she came right at the tale end of an afternoon major. With moon directly overhead, or directly underfoot, it's usually on like bing bong jack.