1873 :
First meteorological observation.

1885 :
Establishment of the first meteorological unit at Tunis-Manoubia for rainfall and climate observation.

1923 :
Establishment of synoptic obervations network by FMO (French Meteorological office) with one major station located at El Aouina aerodrome.

1926 :
First seismic observation made by the meteorological unit.

1945 :
FMO (French Meteorological office) creates a climatologic station.

1955 :
The Tunis-Manoubia unit becomes an office for the inventory of water resources and rainfall data. El Aouina station is now in charge of meteorological and climatologic activities.

1958 :
El Aouina office becomes the National Service of Meteorology in the Department of Aeronautical and Marine Services under the supervision of the Ministry of Public Works and Housing.

1973 :
The National Service of Meteorology becomes Department of Meteorology.

1974 :
The Department of Meteorology becomes the National Institute of Meteorology (NIM).