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 and more recently annual updates to the climate records for thousands of stations worldwide. 

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 still on going as well as the annual collections since 2011.

Data include monthly and annual means of:

  • Station pressure
  • Sea level Pressure
  • Mean Temperature
  • Maximum Temperature
  • Minimum Temperature,
  • Total monthly and annual precipitation

More information to WWR is available at the World Data Centre for Meteorology, National Centers for Environmental Information (NCEI) in Asheville, USA.


Useful reference:




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