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Ok still wearing my newbie cap I thought that I'd throw this question out there. I have been told in both fly fishing classes as well as read in several books that trout really become active in mountain streams where I will be fishing once the temperature of the water hits 40 degrees for 4 consecutive days. So trying not to over think this but since temps fluctuate by a wide margin in the spring, sometimes 20+ degree swings in a single day, does it matter if the water temp hits 40 degrees for only about an hour a day , i.e. that's the high temp for the day and all of the rest of the day its in the 20's and 30's or is this a thing like it needs to be 40 or above consistently for 4 days? Again I hope that I'm not over thinking this. Any insight here would be great. Thanks.