What is the best wind direction to avoid the flies in Lewes Delaware?
There isn't a best wind direction to avoid the flies. Windy days are better days to be at the beach and avoid the flies because they have greater difficulty flying during high winds. Management of the flies is impractical and not cost effective since there are so many wetlands in Delaware. States (e.g., Florida) with much greater beach front property and recreational areas have stated the same, and have implemented some traps for the flies with some, although limited success. Application of an insecticide to repel the insects is an option (i.e., deet); however, if you are getting into the water at the beach, then the insecticide will be washed off eventually.