Ralph, your experience and concise explanation was great.
Water temp is obviously a huge factor. If one is to go winter fishing, consider the type of water you are venturing to: tailwater, spring creek, freestone, stillwater... each of these fisheries near the same altitude in the same region can have vastly different water temperatures! Some may be more productive than others...
I notice a big difference in brown trout on the Lower Owens once the water gets above 44, then 46, then 50... Look out!!!!!
I've been squatting in a duck blind on Hot Creek in middle of January, freezing my a$$ off, watching fish sipping on the surface before sunrise! Being mostly spring-fed, the water was "warm" near 50 deg.
Good advice is to take a thermometer and use it against your observations, make notes, apply over time.
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