you clearly have no experience of these critters
Each year I get my first mosquito bite while there is still a decent amount of snow on the ground. If it's warm enough for grazing stuff to grow, it's plenty warm enough for the Biting Bastards to breed by the billion and chow down. You cannot flee, you can only endure.
Knott/Midge/Blackfly/No-see-um. Death by a billion cuts. Small enough to crawl through a jumper or netting. Ridiculously disproportionate pain/size ratio.Love to gnaw on ear passages, nostrils, edges of eyelids. To small to swat on a practical basis. Found by the millions. Not really bothered much by DEET or other repellents in my experience.
Mygg/Mosquito. Death by exsanguination. Simply poke their proboscis through normal clothing and netting to feast on contents. Fragile, but swat the first thousand, the next lot will thank you for clearing the way. Found by the hundred thousands. Can be repelled, thank god.
Broms/Kleg/Cleg/Deerfly. You'll wish for death as a reprieve from the terror induced by the perpetual droning followed by stabbing pain. Elegantly simple feeding method - biting loose a chunk of meat so they can drink blood from the crater. Can bite through the hide of moose or cow, also through jeans+human skin. Swatting generally only stuns them for a second unless you use extreme force i.e. punching yourself in self-defense. Normally only found by the hundred. Probably drink shots of DEET while relaxing at the end of a hard day.