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World Weather Records (WWR)

Initiated by a resolution at the 1923 International Meteorological Organization (IMO) Conference, WWR was a monumental international undertaking producing a large volume of monthly temperature, precipitation and pressure data from hundreds of stations around the world, some with data starting in the early 1800s. The WWR project continues today under the auspices of the WMO with the digital publication of decadal updates to the climate records for thousands of stations worldwide (National Climatic Data Center, 2005). 

World Weather Records (WWR) have been published since 1927, and include monthly mean values of pressure, temperature, precipitation, and where available, station metadata notes documenting observation practices and station configurations. Data were supplied by National Meteorological Services of the WMO Members. The first issue included data from earliest records available at that time up to 1920. Data have been collected for periods 1921-30 (2nd Series), 1931-40 (3rd Series), 1941-50 (4th Series), 1951-60 (5th Series), 1961-70 (6th Series), 1971-80 (7th Series), 1981-90 (8th Series), and 1991-2000 (9th Series). The WWR process of collection for the 10th series (2001-2010) is going to start soon.

Data include monthly and annual means of:

  • Station pressure
  • Sea level Pressure
  • Monthly Mean Temperature
  • Daily Maximum Temperature
  • Daily Minimum Temperature

More information to WWR is available at the World Data Centre for Meteorology at the NOAA/National Climatic Data Centre (NCDC) in Asheville, USA.

During Congress XVI, hold in Geneva 2011, the importance of updating the World Weather Records continuously was emphasized. It was requested to complete the data sets for WWR 1991-2000 and WWR 2001-2010 and to move to annual updates afterwards. For more information see the document on the World Climate Programme (


Guidelines for the submission of the World Weather Records

Excel template for the submission of the World Weather Records


Useful reference:

Assessing the Need for Annual Updates to World Weather Records


Circular letters to all Members of WMO (Collection of WWR 1991-2000, 2001-2010, 2011, 2012)


Letter RA-I English
Letter RA-I Arabic
Letter RA-I French
Letter RA-II English
Letter RA-II Russian
Letter RA-III English
Letter RA-III Spanish
Letter RA-III French
Letter RA-IV English
Letter RA-IV Spanish
Letter RA-IV French
Letter RA-V English
Letter RA-V French
Letter RA-VI English
Letter RA-VI French
Letter RA-VI Spanish
Letter RA-VI Arabic
Letter RA-VI Russian

Current status of the collection of the WWR

«WMO Climatological Normals                                   Global surface temperature data sets»



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