As someone who spent virtually the entirety of his life in a inner city in the North East, of North America we have lots of mosquitoes here. Which parts of the world do you come from? Some place with a good mosquito control department I assume?
I can't really explain it. I was as surprised as anyone when I realized I can't remember the last time I saw a mosquito.
It's Calgary, Canada. The climate is fairly arid, but there are definitely mosquitos in the area. I just haven't seen one in a long time, despite being outside for at least a couple of hours every day.
I suspect if I walked along the river more I'd see some though.