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Use of these data is covered by the following licence(s):
http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/
When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.

CRU TS 3.00 data files acquired directly from CRU in 2007. CRU provided the BADC with software to generate the CRU datasets in 2010, and this was used to produce CRU TS 3.10 at the BADC in early 2011.

In July 2012, systematic errors were discovered in the CRUTS v3.10 process. The effect was, in some cases, to reduce the gridded values for PRE and therefore WET. Values of FRS were found to be unrealistic in some areas due to the algorithms used for synthetic generation. The files (pre, frs and wet) were immediately removed from BADC. The corrected run for precipitation, based on the v3.10 precipitation station data, was generated as a direct replacement and given the version number 3.10.01. There were no corrected runs produced for wet and frs.

CRU TS 3.20 was produced in December 2012.
In March 2013, CRU TS observation databases for TMP and PRE variables were provided by CRU. Others are in preparation. In july 2013, two errors were found in the PRE and WET variables of CRU TS v3.20. These have been repaired in CRU TS v3.21. Details of the errors found are available in the Release Notes in the archive.

Please see Mitchell and Jones, 2005 (http://dx.doi.org/10.1002/joc.1181). The CRU TS3.00 files were produced by CRU and include data up to the end of 2006. However, only data up to June 2006 should be used. For dates later than this, any subsequent updates/corrections to the original data have not been included, so the values may be misleading. Please note, CRU TS 3.00 NetCDF data are experimental, not all attributes are correctly set yet. The data themselves should be identical to those in the ASCII versions. For CRU TS 3.10, the data have been examined in detail for consistency with CRU TS 3.00 by the CRU. Small differences may occur where additional station data have become available since CRU TS 3.00 was generated and are now included in the analysis. The data from the entire period 1901-2009 can be used, and all of the attributes in the NetCDF files are correctly set. For each new release of the CRU TS data, the underlying datasets have been improved. New stations have been added. Some stations have been removed for quality control purposes. This explains why data may not be exactly the same for a common time period.

The CRU TS 3.20 data (i.e. climate variables) are available in both compressed (.gz extension) ASCII ".dat" and netcdf ".nc" file formats. CRU TS 3.20 metadata files (i.e. stations and observations) are available in ASCII. To understand how to read the CRU TS 3.20 data and metadata files, please refer to the CRU_TS_3.20_File_Formats_explained PDF documentation (under Linked Documentation below).