The International Comprehensive Ocean Atmosphere Data Set (ICOADS) 1662-present: contains the full suite of meteorological variables and also sea surface temperature from marine platforms such as ships and buoys.

World Ocean Circulation Experiment (WOCE) 1990 - 2002
The WOCE data set is the most comprehensive data set ever collected from the global ocean. The site provides access to the final (3rd) version of the data set collected during the World Ocean Circulation Experiment (1990-1997).

World Ocean Database 2009 (WOD09) is an update of World Ocean
Database 2005 (WOD05). All data are available online presorted by 10 °
geographic squares, by year or by user specified criteria.  WOD09 has extensive documentation. Users can obtain data.

RECovery of Logbooks And International Marine data (RECLAIM) Project. A cooperative international project to locate and image historical ship logbooks and related marine data and metadata from archives across the globe, and to digitize the meteorological and oceanographic observations for merger into the International Comprehensive Ocean-Atmosphere Data Set (ICOADS) and for utilization for climate research. The project seeks to provide expert guidance and assistance to data rescue projects, concerning national archive holdings, and the content and characteristics of their marine records, historical observational practices, and metadata.

Oldweather (Oldweather.org) is helping scientists recover worldwide weather observations made by Royal Navy ships around the time of World War I. These transcriptions will contribute to climate model projections and improve a database of weather extremes. Historians will use the work to track past ship movements and the stories of the people on board.

Atmospheric Circulation Reconstructions over the Earth (ACRE) working group on Data Rescue.