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HadCET Data: Download

The current version of the HadCET dataset, along with provisional values for the current year, are available to view and download from this page.

The data files are updated daily at around midday.
The daily series include values up to two days prior to the current date.
The latest monthly and seasonal values are added two days after the end of the period.

Current version: v2.1.0.0 + Provisional (2025 onwards)

The current version of HadCET is based on the scientific methodology used for the V2 series as described in Parker et al (1992) and Legg et al (2025).


CEDA Archive

Legacy versions of the HadCET dataset are now available for download from the CEDA Archive data collection - link to CEDA Archive.

The files in the archived versions of the dataset are stored in BADC-CSV format with metadata included alongside the values.
However, the values can be copied out in a CSV format.

As well as containing the HadCET daily/monthly/seasonal series and ranked table files, the version controlled datasets on CEDA also contain the static urban and station homogenisation adjustments and post-1974 adjustments to Manley's temperature series.

Citing HadCET

All version controlled datasets on CEDA are fully DOI'd and available for citation.

If you want to cite the HadCET dataset in a scientific paper, ensure that the correct version number is referenced and DOI included from the CEDA archive dataset.


File formatting

All files are output as plain text files. This format was chosen to allow users to easily view the CET values through this webpage.
These values can be imported into an Excel spreadsheet using "text to columns" with a space delimiter.

The file layout and naming conventions of the HadCET values and ranked table files can be found here.


Calculating temperature anomalies

The series files available for download below only contain the actual HadCET values and not the anomalies.

Instructions on how to calculate HadCET temperature anomalies against a particular climatological period can be found here.



View data and diagnostics for the current year and the previous few years.




HadCET Series Values


Daily

Mean Temperature

Date range: 1772 to current

File: meantemp_daily_totals.txt

Min Temperature

Date range: 1878 to current

File: mintemp_daily_totals.txt

Max Temperature

Date range: 1878 to current

File: maxtemp_daily_totals.txt



Monthly

Mean Temperature

Date range: 1659 to current

File: meantemp_monthly_totals.txt

Min Temperature

Date range: 1878 to current

File: mintemp_monthly_totals.txt

Max Temperature

Date range: 1878 to current

File: maxtemp_monthly_totals.txt



Seasonal

Mean Temperature

Date range: 1659 to current

File: meantemp_seasonal_totals.txt

Min Temperature

Date range: 1878 to current

File: mintemp_seasonal_totals.txt

Max Temperature

Date range: 1878 to current

File: maxtemp_seasonal_totals.txt





HadCET Ranked Tables - warmest to coldest


Monthly

Mean Temperature

Date range: 1659 to current

File: meantemp_ranked_monthly.txt

Min Temperature

Date range: 1878 to current

File: mintemp_ranked_monthly.txt

Max Temperature

Date range: 1878 to current

File: maxtemp_ranked_monthly.txt



Seasonal

Mean Temperature

Date range: 1659 to current

File: meantemp_ranked_seasonal.txt

Min Temperature

Date range: 1878 to current

File: mintemp_ranked_seasonal.txt

Max Temperature

Date range: 1878 to current

File: maxtemp_ranked_seasonal.txt





HadCET V2 station observations


Mean Temperature

Date range: 1853 to current

File: cet_mean_station_series.txt

Min Temperature

Date range: 1853 to current

File: cet_min_station_series.txt

Max Temperature

Date range: 1853 to current

File: cet_max_station_series.txt

List of active CET stations

Date range: 1853 to current

File: cet_station_active_flags.txt