RELEASE NOTES FOR CRU TS v4.10: 7 June 2026

The CRU TS dataset was developed and has been subsequently updated,
improved and maintained with support from a number of funders,
principally the UK's Natural Environment Research Council (NERC) and the
US Department of Energy. Long-term support is currently provided by the
UK National Centre for Atmospheric Science (NCAS), a NERC collaborative
centre. 

The 4.10 release of the CRU TS dataset covers the period 1901-2025.

The main interpolation algorithm is unchanged since v4.03.

To understand this dataset, it is important to understand its
construction and limitations. It is therefore recommended that all users
read the relevant paper:

Harris, I., Osborn, T.J., Jones, P. et al. Version 4 of the CRU TS
monthly high-resolution gridded multivariate climate dataset.
Sci Data 7, 109 (2020). https://doi.org/10.1038/s41597-020-0453-3

1. What's new in 4.10

1.1 Process changes

No changes in the process have been made since v4.09.

CLIMAT observations for 2025 were drawn from MCDW (as usual) and ACORN
observations for 2025 were drawn from BoM (for Australia Tmin and Tmax).
These were then all passed through the CRU TS QC processes.

2. Output files

For now, the approach of issuing NetCDF and ASCII files in parallel will
remain, as will the publications of decadal files as well as full-length
versions. However, decadal files may not be archived when superseded, in
order to make best use of space.

As always, please contact BADC/CEDA in the first instance if you have any
questions, observations or suggestions (and have acquired CRU-TS from
them). If, however, you wish to contact CRU directly about these datasets,
please contact a.friedman@uea.ac.uk or t.osborn@uea.ac.uk

Ian 'Harry' Harris has now retired and updating of the CRU-TS family
of datasets is now being undertaken by Andrew Friedman under the guidance
of Tim Osborn.

Andrew Friedman
NCAS-Climate
Climatic Research Unit
School of Environmental Sciences
University of East Anglia
Norwich
NR4 7TJ

All enquiries: a.friedman@uea.ac.uk or t.osborn@uea.ac.uk