CRU CY4.00: Climatic Research Unit (CRU) year-by-year variation of selected climate variables by country (CY) version 4.00 (Jan. 1901 - Dec. 2015)

The Climatic Research Unit (CRU) Country (CY) data version 4.00 dataset consists of ten climate variables for country averages at a monthly, seasonal and annual frequency; including cloud cover, diurnal temperature range, frost day frequency, precipitation, daily mean temperature, monthly average daily maximum and minimum temperature, vapour pressure and potential evapotranspiration. This version uses the updated set of country definitions, please see the appropriate Release Notes.

This dataset was produced in 2017 by CRU at the University of East Anglia and extends the CRU CY3.23 data to include 2015. CRU CY4.00 is a full release, differing only in methodology from the existing current release, v3.24.01. Both are released concurrently to support comparative evaluations between these two versions. The data are available as text files with the extension '.per' and can be opened by most text editors.

Spatial averages are calculated using area-weighted means. CRU CY4.00 is derived directly from the CRU TS4.00 dataset. CRU CY version 4.00 spans the period 1901-2015 for 289 countries.

To understand the CRU CY4.00 dataset, it is important to understand the construction and limitations of the underlying dataset, CRU TS4.00. It is therefore recommended that all users read the Harris et al, 2020 paper and the CRU TS4.00 release notes listed in the online documentation on this record.

CRU CY data are available for download to all CEDA users.

Date (Publication): 2017-04-07T09:09:27

Date (Creation): 2017-04-07T09:09:27

Citation identifier: https://catalogue.ceda.ac.uk/uuid/8b6b52b3a34c4964b35f918555e10ec1

Citation identifier: Centre for Environmental Data Analysis (CEDA) / 8b6b52b3a34c4964b35f918555e10ec1

Citation identifier: doi / http://dx.doi.org/10.5285/8b6b52b3a34c4964b35f918555e10ec1

Point of contact

Organisation name	Individual name	Electronic mail address	Role
University of East Anglia Climatic Research Unit (CRU)		cru@uea.ac.uk	Author
Unavailable	Harris, Ian C	Unavailable	Author
Unavailable	Jones, Philip D.	Unavailable	Author
Centre for Environmental Data Analysis (CEDA)		support@ceda.ac.uk	Custodian
University of East Anglia Climatic Research Unit (CRU)		cru@uea.ac.uk	Owner
Centre for Environmental Data Analysis (CEDA)		support@ceda.ac.uk	Distributor
Unavailable	Harris, Ian C	Unavailable	Principal investigator
Unavailable	Jones, Philip D.	Unavailable	Principal investigator
Centre for Environmental Data Analysis (CEDA)		support@ceda.ac.uk	pointofContact
Unavailable	Harris, Ian C	Unavailable	pointofContact
Centre for Environmental Data Analysis (CEDA)		support@ceda.ac.uk	Publisher

Maintenance and update frequency: Not planned

Update scope: Dataset

Keywords

CRU
CRU CY
climate

GEMET - INSPIRE themes, version 1.0

atmospheric conditions

Access constraints: Other restrictions

Other constraints: Access to these data is available to any registered CEDA user. Please Login or Register for a CEDA account to gain access.

Use constraints: Other restrictions

Other constraints: Under the following licence http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/, appropriate use of these data may fall under any use. This message is intended as guidance, always read the full licence. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.

Spatial representation type: Grid

Language: English

Topic category

Climatology, meteorology, atmosphere

Begin date: 1901-01-01T00:00:00

End date: 2015-12-31T23:59:59

Unique resource identifier: WGS 84

Distribution format

Name	Version
The CRU CY data are provided as text files with the extension ".per", most text editors will open these files. See the linked file formats guide for more information.

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
Centre for Environmental Data Analysis (CEDA)		support@ceda.ac.uk	Distributor

OnLine resource

Protocol	Linkage	Name
	https://catalogue.ceda.ac.uk/uuid/8b6b52b3a34c4964b35f918555e10ec1	CEDA Data Catalogue Page

OnLine resource

Protocol	Linkage	Name
	http://data.ceda.ac.uk/badc/cru/data/cru_cy/cru_cy_4.00	DOWNLOAD

OnLine resource

Protocol	Linkage	Name
	http://www.cru.uea.ac.uk/cru/data/hrg	Climate Research Unit (CRU) data Homepage

OnLine resource

Protocol	Linkage	Name
	https://doi.org/10.1038/s41597-020-0453-3	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

OnLine resource

Protocol	Linkage	Name
	http://data.ceda.ac.uk/badc/cru/doc/CRU_CY_File_formats_guide.pdf	CRU CY File formats guide

OnLine resource

Protocol	Linkage	Name
	http://data.ceda.ac.uk/badc/cru/data/cru_ts/cru_ts_4.00/Release_Notes_CRU_TS4.00.txt	CRU CY 4.00 Release Notes (as CRU TS 4.00)

OnLine resource

Protocol	Linkage	Name
	http://help.ceda.ac.uk/article/4472-cru-data-user-guide	CRU User Guide

OnLine resource

Protocol	Linkage	Name
	http://data.ceda.ac.uk/badc/cru/data/cru_cy/cru_cy_4.00/Read_Me_CRU_CY_Updated_Country_Definitions.txt	CRU CY4.00 Updated country definitions

Hierarchy level: Dataset

Conformance result

Title: Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services

Date (Publication): 2010-12-08

Statement: The Climatic Research Unit (CRU) CY data are derived directly from the CRU TS data, and version numbering is matched between the two datasets. The CRU CY data are produced by the CRU unit at the University of East Anglia and passed to the Centre for Environmental Data Analysis (CEDA) for long term archival and distribution. Previous releases of CRU CY include:

CRU CY 4.00 data were passed to CEDA for archival and distribution by CRU in March 2017

CRU CY 3.24.01 data files supplied to CEDA for long term archival by CRU in January 2017.

The CRU CY 3.24 data were withdrawn by CRU and CEDA in January 2017 due to known issues with the data.

CRU CY 3.24 data files supplied to CEDA for long term archival by CRU in October 2016.

Metadata

File identifier: 8b6b52b3a34c4964b35f918555e10ec1 XML

Metadata language: English

Character set: UTF8

Parent identifier: Climatic Research Unit (CRU): Year-by-Year Variation of Selected Climate Variables by CountrY (CY) v4
a5fc25a8153148b9872f24ab889f64a9

Hierarchy level: Dataset

Date stamp: 2025-09-11T02:11:44

Metadata standard name: UK GEMINI

Metadata standard version: 2.3

Metadata author

Organisation name	Individual name	Electronic mail address	Role
Centre for Environmental Data Analysis (CEDA)		support@ceda.ac.uk	Point of contact

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