The World Meteorological Organization (WMO) is an authoritative United Nations agency dealing with the state and evolution of the Earth's atmosphere, its interaction with land and oceans, the weather and climate it produces and the resulting distribution of water resources.
Source: https://public.wmo.int/en/about-us/who-we-are
Deutsch: Die Weltorganisation für Meteorologie
Français: L’Organisation météorologique mondiale (OMM)
Nederlands: De Wereld Meteorologische Organisatie (WMO)