I met my first mosquito in Switzerland. In London we did not have so many mosquitos. There was probably too much competition with the traffic. In Switzerland they usually gather late Summer, early Autumn. You do not really see them, but you definitely hear them with their buzzing- I am prepared with my anti mosquito weapons. Just fill it with some sort of liquid and plug it in. You are then mosquito free for the night. There is nothing worst than having to scratch all day with the itchy bumps they leave behind.