Below are links to a variety of temperature/climate data widely used by bloggers, including 'C3' for its charts. Decided to compile this list in a single post (and a permanent 'C3' page that will be updated) after wasting way too much time trying to find an obscure HadCRUT dataset that was buried on one of the UK MetOffice web pages. We hope this will save others the time and frustration of searching for a particular dataset.
Data/Info.....NOAA CO2 Levels – Mth.
Data/Info.....NOAA CO2 Levels – Annl.
Data/Info.....D.O.E. Pre-1958 CO2 Levels – Annl.
Data/Info.....UAH Satellite Temperatures
Data/Info.....RSS Satellite Temperatures
Data/Info.....Met Office/Hadley Dataset Info
Data/Info.....Met Office/Hadley FAQ
Data/Info.....Met Office/Hadley H.C.4 Info
Data/Info.....HadCRUT4 Global Land/Sea-Mth.
Data/Info.....HadCRUT4 N. Hemi. Land/Sea-Mth.
Data/Info.....HadCRUT4 S. Hemi. Land/Sea-Mth.
Data/Info.....HadCRUT4 Tropics Land/Sea-Mth.
Data/Info.....HadCRUT4 Global Land/Sea-Annl.
Data/Info.....HadCRUT4 N. Hemi. Land/Sea-Annl.
Data/Info.....HadCRUT4 S. Hemi. Land/Sea-Annl.
Data/Info.....HadCRUT4 Tropics Land/Sea-Annl.
Data/Info.....HadCRUT3 Diagnostics
Data/Info.....HadCRUT3 Global Land/Sea-Mth.
Data/Info.....HadCRUT3 N. Hemi. Land/Sea-Mth.
Data/Info.....HadCRUT3 S. Hemi. Land/Sea-Mth.
Data/Info.....HadCRUT3 Tropics Land/Sea-Mth.
Data/Info.....HadCRUT3 NrthExTropics Land/Sea-Mth.
Data/Info.....HadCRUT3 SthrnExTropics Land/Sea-Mth.
Data/Info.....HadCRUT3 Tropics & MidLat. Land/Sea-Mth.
Data/Info.....HadCRUT3 Global Land/Sea-Annl.
Data/Info.....HadCRUT3 N. Hemi. Land/Sea-Annl.
Data/Info.....HadCRUT3 S. Hemi. Land/Sea-Annl.
Data/Info.....HadCRUT3 Tropics Land/Sea-Annl.
Data/Info.....HadCRUT3 NrthExTropics Land/Sea-Annl.
Data/Info.....HadCRUT3 SthrnExTropics Land/Sea-Annl.
Data/Info.....HadCRUT3 Tropics & MidLat.
Land/Sea-Annl.
Data/Info.....HadCET (Central England Temps - Land)
Data/Info.....HadCET Monthly (Starting Jan. 1659 AD)
Data/Info.....HadCET Annual (Starting 1659 AD)
Data/Info.....HadSST3 Info (Sea Surface)
Data/Info.....HadSST3 Downloads
Data/Info.....HadSST3 Global-Mth.
Data/Info.....HadSST3 N.Hemi.-Mth.
Data/Info.....HadSST3 S.Hemi.-Mth.
Data/Info.....HadSST3 Tropics-Mth.
Data/Info.....HadSST3 Global-Annl.
Data/Info.....HadSST3 N.Hemi.-Annl.
Data/Info.....HadSST3 S.Hemi.-Annl.
Data/Info.....HadSST3 Tropics-Annl.
Data/Info.....HadSST2 Info (Sea Surface)
Data/Info.....HadSST2 Diagnostics
Data/Info.....HadSST2 Global-Mth.
Data/Info.....HadSST2 N.Hemi.-Mth.
Data/Info.....HadSST2 S.Hemi.-Mth.
Data/Info.....CRUTEM3 Info (Land Surface)
Data/Info.....CRUTEM3 Downloads
Data/Info.....CRUTEM3 Global-Mth.
Data/Info.....CRUTEM3 N. Hemi.-Mth.
Data/Info.....CRUTEM3 S. Hemi.-Mth.
Data/Info.....CRUTEM3 Tropics-Mth.
Data/Info.....CRUTEM3 NrthExTropics-Mth.
Data/Info.....CRUTEM3 SthrnExTropics-Mth.
Data/Info.....CRUTEM3 Tropics & MidLat.-Mth.
Data/Info.....CRUTEM3 Global-Annl.
Data/Info.....CRUTEM3 N. Hemi.-Annl.
Data/Info.....CRUTEM3 S. Hemi.-Annl.
Data/Info.....CRUTEM3 Tropics-Annl.
Data/Info.....CRUTEM3 NrthExTropics-Annl.
Data/Info.....CRUTEM3 SthrnExTropics-Annl.
Data/Info.....CRUTEM3 Tropics & MidLat.-Annl.
Data/Info.....CRUTEM4 Info (Land Surface)
Data/Info.....CRUTEM4 Downloads
Data/Info.....CRUTEM3 Global-Mth.
Data/Info.....CRUTEM3 N. Hemi.-Mth.
Data/Info.....CRUTEM3 S. Hemi.-Mth.
Data/Info.....CRUTEM3 Global-Annl.
Data/Info.....CRUTEM3 N. Hemi.-Annl.
Data/Info.....CRUTEM3 S. Hemi.-Annl.
Data/Info.....NOAA Reynolds Olv2 SST
Data/Info.....NCDC (NOAA) Temp. Anomaly Info
Data/Info.....NCDC (NOAA) Global Land/Sea-Mth.
Data/Info.....NCDC (NOAA) N. Hemi. Land/Sea-Mth.
Data/Info.....NCDC (NOAA) S. Hemi. Land/Sea-Mth.
Data/Info.....NCDC (NOAA) Global Land/Sea-Annl.
Data/Info.....NCDC (NOAA) Global Sea-Mth. (Sea Surface)
Data/Info.....NCDC (NOAA) N. Hemi. Sea-Mth.
Data/Info.....NCDC (NOAA) S. Hemi. Sea-Mth.
Data/Info.....NCDC (NOAA) Global Sea-Annl.
Data/Info.....NCDC (NOAA) Global Land-Mth. (Land Surface)
Data/Info.....NCDC (NOAA) N. Hemi. Land-Mth.
Data/Info.....NCDC (NOAA) S. Hemi. Land-Mth.
Data/Info.....NCDC (NOAA) Global Land-Annl.
Data/Info.....GISS (NASA) Info
Data/Info.....GISS (NASA) Global Land/Sea
Data/Info.....GISS (NASA) N. Hemisphere Land/Sea
Data/Info.....GISS (NASA) S. Hemisphere Land/Sea
Note for newbies: Some links go to a web page with the data. Other links automatically download the dataset file when the link is clicked. For the HadCrut, HadSST, HadCET and CRUT files, add a ".dat" after the filename when downloading - that will allow the file to be opened in Excel. For most of the datasets, the first column is date information (often the 2nd column also) and the very next column after the date information is the temperature anomaly.