"Head in the clouds" project is about increasing scientific spirit by studying meteorology and comparing weather among eight European countries. Weather seems to be a very common subject. Despite of this, its technical aspects are rarely studied at school. It has nevertheless a real and concrete impact on our daily life. Studying weather is a way to teach sciences through multidisciplinary activities. This three years project addresses primary school pupils, irrespective of sex, origin, social level or abilities. It is shared in six semesters: - recording weather (creating meteorological instruments) - states of water (experimenting to understand their role in weather) - clouds and extreme natural phenomena (experimenting to create a cloud, creating a clouds dictionary, creating a board game) - astronomy (comparing seasons, experimenting to understand length of days and night, high of the sun...) - global warming (comparing effects on culture, water level...) - weather and health