World Meteorological Day (WMD) has been celebrated around the world on 23 March every year since the first World Meteorological Day in 1961. The Day commemorates the entry-into-force, on 23 March 1950, of the Convention of the World Meteorological Organization (WMO).The previous themes are:
1961 Meteorology - general themes
1962 Contribution of meteorology to agriculture and food production
1963 Transport and meteorology (in particular, application of meteorology to aviation)
1964 Meteorology as a factor of economic development
1965 International cooperation in meteorology
1966 World Weather Watch
1967 Weather and water
1968 Meteorology and agriculture
1969 The economic value of meteorological services
1970 Meteorological education and training
1971 Meteorology and human environment
1972 Meteorology and human environment
1973 One hundred years of international cooperation in meteorology
1974 Meteorology and tourism
1975 Meteorology and telecommunications
1976 Weather and food
1977 Weather and water
1978 Meteorology and research for the future
1979 Meteorology and energy
1980 Man and climatic variability
1981 World Weather Watch as a tool for development
1982 Observing the weather from space
1983 The weather observer
1984 Meteorology aids food production
1985 Meteorology and public safety
1986 Climate variations, drought and desertification
1987 Meteorology: a model of international cooperation
1988 Meteorology and the media
1989 Meteorology in the service of aviation
1990 Natural disaster reduction: how meteorological and hydrological services can help
1991 The atmosphere of the living planet Earth
1992 Weather and climate services for sustainable development
1993 Meteorology and the transfer of technology
1994 Observing the weather and climate
1995 Public weather services
1996 Meteorology in the service of sports
1997 Weather and water in cities
1998 Weather, oceans and human activity
1999 Weather, climate and health
2000 The World Meteorological Organization - 50 years of service
2001 Volunteers for weather, climate and water
2002 Reducing vulnerability to weather and climate extremes
2003 Our future climate
2004 Weather, climate and water in the information age
2005 Weather, climate, water and sustainable development
2006 Preventing and mitigating natural disasters
2007 Polar meteorology; understanding global impacts
2008 Observing our planet for a better future
2009 Weather, climate and the air we breathe