Abstract EN:

Nancy is a cold town, on a French scale, but mild in comparison with central Europe. The year splits up into two seasons. Winter and summer, the weather's types classification is drawn up from air masses. The western maritime tropical air brings about a generally overcast weather, mild in winter, cool in summer and stable in all seasons. In winter, the south-western tropical air doesn't differ very much from western tropical air, but becomes warm and stormy in summer. In summer, the Saharan air, hot and very unstable with hail risks, becomes humidified on the Mediterranean Sea. The maritime arctic cold air is cool and generally unstable, a characteristic which is more pronounced in north-western regime than in western one. The rare maritime arctic air developed in winter, becomes more individual with the icy north wind, and brings about a very unstable and snowy weather, but low precipitation. In winter, the continental arctic cold air located in low layers, linked with Mediterranean air in "east returns", is the kind of weather which brings about the most snow in the western France. The air tropical air from anticyclones usually takes a continental characteristic. It is often cold and misty in winter, warm in summer. The maritime arctic cold air from anticyclone is cool in all seasons. The continental Artic cold air in winter and in eastern regime gets from cold to very cold and wet. Disturbed weathers predominate. Cold air masses globally prevail over warm air masses in spite of their slight superiority in summer. Maritime air outclasses little continental and continentalized air masses. Variations are considerable from year to year.