Gridded In Situ:

• Berkeley Earth Surface Temperature

http://www.berkeleyearth.org

• Climatic Research Unit (CRU) land surface air temperature data set (CRUTEM4)

https://www.metoffice.gov.uk/hadobs/hadcrut4/

• GISS Surface Temperature Analysis (GISTEMP)

https://data.giss.nasa.gov/gistemp/

• Gridded Temperature And Precipitation Climate Extremes Indices (Climdex Data)

http://www.climdex.org/datasets.html

• Gridded Night Marine Air Temperature (HadNMAT2) Global Temperature

https://www.metoffice.gov.uk/hadobs/hadnmat2/

• Hadley Centre Climatic Research Unit global historical surface temperature (HadCRUT4)

https://www.metoffice.gov.uk/hadobs/hadcrut4/

• Japan Meteorological Agency (JMA) Global Temperature

https://ds.data.jma.go.jp/tcc/tcc/products/gwp/temp/ann_wld.html

• National Oceanic and Atmospheric Administration (NOAA) Global Temperature

https://www.ncdc.noaa.gov/data-access/marineocean-data/noaa-global-surf…

In Situ:

• Integrated Surface Database (ISD) of the National Centers for Environmental Information (NCEI) of the National Oceanic and Atmospheric Administration (NOAA)

https://www.ncdc.noaa.gov/isd/data-access

• Global Historical Climatology Network Daily (GHCN-Daily) of the National Centers for Environmental Information (NCEI) of the National Oceanic and Atmospheric Administration

https://data.noaa.gov/dataset/global-historical-climatology-network-dai…

• Hadley Centre Integrated Surface Database (HadISD)

https://www.metoffice.gov.uk/hadobs/hadisd/

• International Comprehensive Ocean-Atmosphere Data Set (ICOADS)

https://rda.ucar.edu/datasets/ds548.0/

• International Surface Temperature Initiative (ISTI)

http://www.surfacetemperatures.org/

Reanalysis:

• REANALYSES.ORG (Inventory for Reanalysis)

http://reanalyses.org