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HadEX2 - global gridded climate extremes indices

HadEX3 (1901-2018) is now available here.

HadEX2 is a global land-based climate extremes dataset produced through the coordination of the joint WMO CCl/CLIVAR/JCOMM Expert Team on Climate Change Detection and Indices (ETCCDI). It comprises of 27 indices of temperature and precipitation on a 2.5° x 3.75° grid from 1901 to 2010. The indices represent seasonal and/or annual values derived from daily station data. Data are calculated using RClimDex/FClimDex software; developed and maintained on behalf of the ETCCDI by the Climate Research Branch of the Meteorological Service of Canada.

Brief description of the data

Indices are derived from RClimDex using high quality daily data from about 7400 temperature stations and 11600 precipitation stations. Angular-distance weighting is used to interpolate the station data onto the required grid. The software, comprehensive descriptions of all of the indices, details of quality control procedures and references to relevant literature are available from, as are most of the station indices (although not the raw daily data). For a more detailed description of the dataset and its production process, see the paper cited below. We strongly recommend that you read this paper before using the data.

NOTE: This is a mirror of the data held at the website.

NOTE: Data files updated to latest version - includes correction of errors in source data formats (ETR & monthly TX90p, TX10p, TN90p, TN10p) and SDII calculation (18 September 2014)

NOTE: HadEX3 (1901-2018) is now available here.

HadISD sample image

Go to download page Data are available from the download page without charge for the purposes of private study and scientific research, but please read the terms and conditions.

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When using the dataset in a paper, the following is the correct citation to use. We strongly recommend that you read this paper before making use of the data.

Donat, M.G., et al. (2012), Updated analyses of temperature and precipitation extreme indices since the beginning of the twentieth century: The HadEX2 dataset, JGR Atmospheres or PDF file

Structural and Parametric Uncertainties

Dunn, Donat & Alexander (2014) (PDF file) have performed an initial assessment of the parametric and structural uncertainties of the HadEX2 dataset. Changes to settings within the HadEX2 methodology (parametric uncertainties) as well as adjustments to the methods used (structural uncertainties) were assessed for all 27 indices. The supplementary material, containing all graphs for each uncertainty for each index, as well as the raw netCDF files can be found here.

Dataset produced in collaboration with:

    Office University of New South Wales University of Melbourne NOAA-NCDC Pacific Climate Impacts Consortium Environment Canada WCRP