No Mosquitos - but flies

I cant believe it, I can sit out at night with a light on, walk around outside with no anti mosy protection and all through the year i have absolutely no problem with Mosquitos. i have visited many destinations in the summer and the mosquito has always been a big problem, but it seems that this microclimate does not suit them. The only insects that are a problem are the daytime flies, there are not a lot of them, but one always seems to decide to antagonise me continually untill i chase it in an attempt to KILL, then with its superior intelligence it hides untill i resume what i was doing, then it comes back again, if i do manage to kill it another takes over where the last one left off, -- Back shortly i´m just going for the kill...........