WCDMP-No. 77

Guidelines for the submission of the World Weather Records tenth series (2001-2010)

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The World Weather Records (WWR) database contains historical monthly climatic data from land surface stations worldwide. First released in 1927, the WWR database has been widely employed in operational climate monitoring, international climate assessments, and numerous other applications. To date, there have been nine editions of WWR, the first containing data up through 1920, with each successive release containing data for another decade (i.e., 1921-1930, 1931- 1940, 1941-1950, 1951-1960, 1961-1970, 1971-1980, 1981-1990, 1991- 2000). Since its inception, WWR has been produced by three different institutions: the Smithsonian Institution (1927, 1934, 1947)

the U.S. Weather Bureau (1959, 1967)

and the U.S. National Oceanic and Atmospheric Administration (NOAA

1983, 1991, 2005). The current edition will also be produced by NOAA. It addresses the 2001-2010 period, consistent with WMO Secretariat guidance. However, the previous edition lacked data for many countries, posing an impediment to climate monitoring and assessment activities because of the decline in station coverage starting in 1991. Congress XVI, Geneva 2011, emphasized the importance of updating the World Weather Records continuously. It requested Members to complete the data sets for WWR 1991-2000 and submit WWR for 2001- 2010.

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14 p.
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WCDMP-No. 77
WMO Programmes