Global surface temperature data: HadCRUT4 and CRUTEM4

Extending back to 1850 and frequently updated, HadCRUT4 is the longest data set of its type. HadCRUT4 is a combination of the global land surface temperature data set, CRUTEM4 and the global SST data set, HadSST3. HadCRUT4 is different from the most closely comparable products (e.g. NASA GISTEMP and NOAA MLOST) in that no interpolation is performed. As such, there are many coverage gaps; this may be a limiting factor in regional analyses but hemispheric and global means are very consistent with other data sets. Extensive analysis has been done to characterize uncertainties arising from non-climatic factors, for example changing instrumentation and observing practices, changes in station location, and changes in local land use. The resulting distribution of uncertainty is presented as an ensemble of 100 realizations of the data set. Individual ensemble members may be accessed via the Met Office webpage, though many users will likely focus on the ensemble median fields that are distributed online by CRU, Hadley Centre and other organizations. 

Key Strengths:

  • Incorporates many additional data sources beyond GHCN
  • Explicit uncertainty analyses and separate land & ocean data sets
  • Grid-box averaging only; less analysis and smoothing/interpolation than comparable data sets for both land and ocean domains

Key Limitations:

  • More spatial coverage gaps than comparable data sets; not analyzed or infilled like GISTEMP, UDEL or MLOST

Years of Record

1850/01 to 2017/07
temporal metadataID:
http://www.esrl.noaa.gov/psd/thredds/wcs/Datasets/cru/crutem4/std/air.mon.anom.nc

Formats

Timestep

Climatology | Monthly

Domain

Spatial Resolution

5x5 degrees

Ocean or Land

Ocean&Land

Missing Data Flag

missing data present

Vertical Levels

Input Data

~5500 land station records from GHCN and other sources combined with HadSST3

Earth system components and main variables

Data Access: Please Cite data sources, following the data providers' instructions.

Key Figures

Click the thumbnails to view larger sizes

Thumbnails

Captions

Cite this page

National Center for Atmospheric Research Staff (Eds). Last modified 01 Sep 2017. "The Climate Data Guide: Global surface temperature data: HadCRUT4 and CRUTEM4." Retrieved from https://climatedataguide.ucar.edu/climate-data/global-surface-temperature-data-hadcrut4-and-crutem4.

Acknowledgement of any material taken from this page is appreciated. On behalf of experts who have contributed data, advice, and/or figures, please cite their work as well.