World Met Day - March 23

Each year, on March 23, the World Meteorological Organization, its 189 members and the worldwide meteorological community celebrate World Meteorological Day around a chosen theme. This day commemorates the entry into force, in 1950, of the WMO Convention creating the organization. Subsequently, in 1951, WMO was designated a specialized agency of the United Nations System.

This year, the theme is “Powering our future with weather, climate and water”. Click here to read the complete brochure.
As far as I am concerned, I'm still waiting for some rain to come... ;-)

Source: WMO