To get a general idea of when they are around, I think back to the old Yankee adage that says that the black flies are a problem "From Mother's Day to Father's Day". Of course it varies, but it's always somewhere around that period.
The best defense? Dryer sheets. Rub them on you, and if things are really bad, wear a few. Tuck one in your collar, one in each sleeve, etc. You sure look silly, but it does work!
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