On the Green River Weather can play a major role in fly fishing.Take the Blue-Wing -Olive may fly for example.This variety of may fly primarily likes to hatch in over cast conditions.It makes you want to believe that every time it gets over cast the fishing will be dynamite.Sadly that is only true in the rite times of year which are spring and fall.
In the summer bad weather can be the kiss of death so to speak.The best fishing this time of year can be had on terrestrials, such as, ants, crickets, Beatles, hoppers etc, witch prefer warm sunny weather.
Something to remember about the fishing the Green River is that the weather can change very suddenly so always come prepared, bring your rain gear.
Green River fly fishing guide
Utah
Green River fly fishing guides
Utah