| Established | 11 September 1873  (151 years ago) |
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The International Meteorological Organization (IMO; 1873–1951) was the first organization formed with the purpose of exchanging weather information among the countries of the world. It came into existence from the realization that weather systems move across country boundaries; and that knowledge of pressure, temperature, precipitations, etc., upstream and downstream are needed for weather forecasting. It was superseded by the World Meteorological Organization.