Answer

• National Climatic Data Center
  NCDC is the world's largest active archive of weather data
  The following databases are available via NYU on the library databases page:
  OECD iLibrary
  Online port to OECD statistics on energy, economics, labor, trade, and country profiles.
  
  
• UNdata
  This is a database covering selected data series from 20 specialized international data sources for all available countries and areas.
  
  
• WDI Online
  Statistical database featuring economic, social, environmental data back to 1960 for countries of the world.