Hadley Centre Central England Temperature (HadCET) dataset
The CET dataset is the longest instrumental record of temperature in the world. The mean, minimum and maximum
datasets are updated monthly, with data for a month usually available by the 3rd of the next month. A provisional
CET value for the current month is calculated on a daily basis. The mean daily data series begins in 1772 and the
mean monthly data in 1659. Mean maximum and minimum daily and monthly data are also available, beginning in 1878.
Brief description of the data
These daily and monthly temperatures are representative of a roughly triangular area of the United Kingdom enclosed
by Lancashire, London and Bristol. The monthly series, which begins in 1659, is the longest available instrumental
record of temperature in the world. The daily mean-temperature series begins in 1772. Manley (1953, 1974) compiled
most of the monthly series, covering 1659 to 1973. These data were updated to 1991 by Parker et al (1992), who also
calculated the daily series. Both series are now kept up to date by the Climate Data Monitoring section of the
Hadley Centre, Met Office. Since 1974 the data have been adjusted to allow for urban warming: currently a correction
of -0.2 °C is applied to mean temperatures.
The real time diagnostics and data download pages are now using CET v220.127.116.11 published May
2022. Information on the improvements to the homogenisation and data adjustments for this CET version can be found
Data are available from the download
page without charge, but please read the terms and
CET datasets are freely available for use under Open Government License. However, please
acknowledge the source if the data are used in any report or product.
Commercial and media enquiries
You can access the Met Office Customer Centre, any time of the day or night by phone, fax or e-mail.
Trained staff will help you find the information or products that are right for you. Contact the Met Office Customer Centre
When using the data set in a paper, the correct citation to use for HadCET is:
The graph above shows annual anomalies relative to the 1961-1990 average. The red line is a 21-point binomial
filter, which is roughly equivalent to a 10-year running mean.
HadCET diagnostics for the current year and previous few years.
2006 was the warmest year on record for min HadCET.
2014 was the warmest year on record for mean HadCET.
2003 was the warmest year on record for max HadCET.
HadCET is produced using an operational system which relies on a number of components. Daily support is not
available for this system, therefore the data may occasionally not be fully up-to-date. If you encounter any
problems or want to request a more reliable service please contact us.