In reply to islandlynx:
It's also worth noting that I've been midged on sea cliffs as well. I had some huge clouds of midges on top of me whilst I belayed my mate on tree route at suidhe biorach. Basically, wherever you go at that time of year, you're likely to find midges (though fewer in the east than west). Generally though they can't handle any "extremes" of weather: rain, wind or sun.