| 1853 |
First International Meteorological Conference |
| 1873 |
WMO's predecessor, the International Meteorological Organization (IMO) established |
| 1947 |
WMO's Convention agreed at Conference of Directors |
| 1950 |
WMO's Convention enters into force on 23 March |
| 1951 |
WMO established as a specialized agency of the United Nations |
| 1957 |
Global Ozone Observing Station set up |
| 1963 |
World Weather Watch launched |
| 1964 |
Operational Hydrology Programme established
Tropical Cyclone Programme established |
| 1979 |
First World Climate Conference held which led to the establishment of the World Climate Programme |
| 1983 |
WMO long-term planning process established |
| 1985 |
Vienna Conference on Framework Convention for the Protection of the Ozone Layer |
| 1987 |
Marine Meteorology and Associated Oceanographic Activities Programme established |
|
Montreal Protocol calls for reduction of greenhouse gases |
| 1988 |
WMO/UNEP Intergovernmental Panel on Climate Change established |
| 1989 |
Global Atmosphere Watch established |
| 1990 |
Second World Climate Conference initiates the Global Climate Observing System |
|
International Decade for Natural Disaster Reduction begins |
| 1991 |
WMO/UNEP begin process which led to negotiation of the UN Framework Convention on Climate Change |
| 1992 |
UN Conference on Environment and Development (the 'Earth Summit') leads to Agenda 21 |
| 1993 |
Negotiation of UN Convention to Combat Desertification |
| 1994 |
Climate Information and Prediction Services (CLIPS) established |
| 1997 |
El Nino/Southern Oscillation warm episode and severe weather events across the world |
|
Kyoto Conference establishes timetable for reduction of greenhouse gas emissions |
| 1998 |
Strongest El Nino ever coincides with record temperatures followed by La Nina |
| 1999 |
Inauguration of new WMO Headquarters in Geneva |
| 2000 |
The World Meteorological Organization celebrates its 50 years of service |
