+41 (0)22 730 81 11
+41 (0)22 730 81 81
avenue de la Paix, Case postale No. 2300 , Geneva , Switzerland , CH-1211
The World Meteorological Organization is an intergovernmental organization with a membership of 187 Member States and Territories. WMO is the UN system’s authoritative voice on the state and behavior of the Earth’s atmosphere, its interaction with the oceans, the climate it produces and the resulting distribution of water resources. As weather and climate know no national boundaries, international cooperation at a global scale is essential for the development of meteorology and operational hydrology as well as to reap the benefits from their applications. It has its headquarters in Geneva, Switzerland, and is a member of the United Nations Development Group.