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CRU TS3.23_clim: 30 year climatologies derived from Climatic Research Unit (CRU) Time-Series (TS) Version 3.23 of High Resolution Gridded Data of Month-by-month Variation in Climate (Jan. 1901- Dec. 2014)

Update Frequency: Not Planned
Latest Data Update: 2016-07-05
Status: Completed
Online Status: ONLINE
Publication State: Preview
Publication Date:


These data are 30 year climatologies produced from the gridded CRU TS (time-series) 3.23 data are month-by-month variations in climate over the period 1901-2014, on high-resolution (0.5x0.5 degree) grids, produced by the Climatic Research Unit (CRU) at the University of East Anglia. 4 sets of climatologies are produced covering the periods: 1901-1930, 1931-1960, 1961 - 1990 and 1984-2013.

CRU TS 3.23 variables are cloud cover, diurnal temperature range, frost day frequency, PET, precipitation, daily mean temperature, monthly average daily maximum and minimum temperature, and vapour pressure for the period Jan. 1901 - Dec. 2014.

CRU TS 3.23 data were produced using the same methodology as for the 3.21 datasets. In addition to updating the dataset with 2014 data, some new stations have been added for TMP and PRE only. Known issues predating this release remain; the 4.00 release, due soon, will address these.

The 4.00 release will utilise Angular-Distance Weighting (ADW) gridding, promising more accurate results with far greater adjustability and logging. It will cover the same spatial, temporal and variate spaces as version 3.23 (land areas excluding Antarctica at 0.5°x0.5°, monthly from 1901 to 2014 with no missing values, 10 variables).

Versions 3.23 and 4.00 will run concurrently until 2016, after which the new (ADW) approach will be used. This is to allow comparisons between the methods and results to be made by users of the dataset.

The CRU TS 3.23 data are monthly gridded fields based on monthly observational data, which are calculated from daily or sub-daily data by National Meteorological Services and other external agents. The ASCII and netcdf data files both contain monthly mean values for the various parameters.

All CRU TS output files are actual values - NOT anomalies.

CRU TS data are available for download to all CEDA users. The CEDA Web Processing Service (WPS) may be used to extract a subset of the data (please see link to WPS below).

Citable as:  [ PROVISIONAL ] University of East Anglia Climatic Research Unit; Harris, I.C.; Jones, P.D. (9999): CRU TS3.23_clim: 30 year climatologies derived from Climatic Research Unit (CRU) Time-Series (TS) Version 3.23 of High Resolution Gridded Data of Month-by-month Variation in Climate (Jan. 1901- Dec. 2014). Centre for Environmental Data Analysis, date of citation.
Abbreviation: Not defined


Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
Access to these data is available to any registered CEDA user. Please Login or Register for an account to gain access.
Use of these data is covered by the following licence: When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

The exact origins of these data are unclear. However, it would appear that they are 30 year climatologies derived from the source TS 3.23 data by a member of the BADC team around 2015-2016 when these were added to the CEDA Archive.

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.

CRU TS 3.21 was produced in July 2013.

CRU TS 3.22 was produced in July 2014.

In October 2015, CRU TS 3.23 provided by CRU, is the latest version available, superseding all previous data versions (which are available to allow user comparisons).

Data Quality:
No quality control information has been provided for these data by the data provider, nor has any been undertaken by the data centre.
File Format:
Data are netCDF formatted.

Process overview

This dataset was generated by the computation detailed below.

UEA Climatic Research Unit (CRU) High Resolution gridding software deployed on UEA Climatic Research Unit (CRU) computer system


This computation involved: UEA Climatic Research Unit (CRU) High Resolution gridding software deployed on UEA Climatic Research Unit (CRU) computer system. For details about the production of CRU TS and CRU CY datasets, please refer to Harris et al. (2014) - see link below.

Input Description


Output Description


Software Reference


  • var_id: cld
  • units: percentage
  • long_name: cloud cover
  • names: cloud cover
  • var_id: dtr
  • units: degrees Celsius
  • long_name: diurnal temperature range
  • names: diurnal temperature range
  • units: days
  • var_id: frs
  • long_name: ground frost frequency
  • names: ground frost frequency
  • var_id: tmp
  • units: degrees Celsius
  • long_name: near-surface temperature
  • names: near-surface temperature
  • var_id: tmx
  • units: degrees Celsius
  • long_name: near-surface temperature maximum
  • names: near-surface temperature maximum
  • var_id: tmn
  • units: degrees Celsius
  • long_name: near-surface temperature minimum
  • names: near-surface temperature minimum
  • units: mm/day
  • long_name: potential evapotranspiration
  • var_id: pet
  • names: potential evapotranspiration
  • var_id: pre
  • long_name: precipitation
  • units: mm/month
  • names: precipitation
  • units: hPa
  • var_id: vap
  • long_name: vapour pressure
  • names: vapour pressure
  • units: days
  • var_id: wet
  • long_name: wet day frequency
  • names: wet day frequency

Co-ordinate Variables

  • units: degrees_north
  • standard_name: latitude
  • long_name: latitude
  • var_id: lat
  • names: latitude
  • units: degrees_east
  • standard_name: longitude
  • long_name: longitude
  • var_id: lon
  • names: longitude
  • long_name: time
  • standard_name: time
  • var_id: time
  • names: time
Temporal Range
Start time:
End time:
Geographic Extent