CRUTEM4 Data: Download

Data set deprecation: CRUTEM4 has been superseded by CRUTEM5.

Further use of CRUTEM4 is not recommended for purposes other than comparison with newer data sets.

The data are available in two formats: either as a set of compressed plain text files in this data format, or as a set of compressed NetCDF files. Release notes for CRUTEM.4.6.0.0 can be found here. Previous versions of CRUTEM4 can be found here.

Variable	As text	As NetCDF
Best estimate temperature anomalies	CRUTEM.4.6.0.0.anomalies.txt.gz	CRUTEM.4.6.0.0.anomalies.nc.gz
Number of observations	CRUTEM.4.6.0.0.nobs.txt.gz	CRUTEM.4.6.0.0.nobs.nc.gz
Sampling error	CRUTEM.4.6.0.0.sampling_error.txt.gz	CRUTEM.4.6.0.0.sampling_error.nc.gz
Station error	CRUTEM.4.6.0.0.station_error.txt.gz	CRUTEM.4.6.0.0.station_error.nc.gz
Temperature anomalies including biases at the upper uncertainty range	CRUTEM.4.6.0.0.biased_97.5pc.txt.gz	CRUTEM.4.6.0.0.biased_97.5pc.nc.gz
Temperature anomalies including biases at the lower uncertainty range	CRUTEM.4.6.0.0.biased_2.5pc.txt.gz	CRUTEM.4.6.0.0.biased_2.5pc.nc.gz

Monthly updates will add all the available data for one additional month, and may also make small additions or changes to the data for the previous 12 months.

Variance adjusted data

Because the number of observations forming each grid-box average in CRUTEM4 is not constant in space or time, the variability in the gridded anomalies also changes: grid-box averages made from many observations have a smaller variance than those made from few. We have made a "variance adjusted" version of the dataset, where the anomalies have been statistically processed to homogenise the variances.

The strengths and weaknesses of variance adjusted data are discussed in Brohan et al. (2006); please read this before using the data.

The variance adjusted dataset (CRUTEM4v) is available in the same two formats.

CRUTEM.4.6.0.0.variance_adjusted.txt.gz or CRUTEM.4.6.0.0.variance_adjusted.nc.gz

Time series data

Global and hemispheric time series for version CRUTEM.4.6.0.0 can be found here.

Station data

The station records on which the gridded CRUTEM4 dataset is built are available in ascii format in this archive: CRUTEM.4.6.0.0.station_files.zip. This archive contains all station records used to build the CRUTEM4 dataset. Note that code previously released for CRUTEM3 cannot be used to exactly reproduce CRUTEM4 temperature series from these files due to changes in the processing methodology used.

Acknowledgements to national meteorological services

The Met Office would like to thank the following countries' national meteorological services for kindly agreeing to the release of some or all of their climate data used in constructing the CRUTEM4 data set. Users of the data are required to abide by any additional conditions for re-use of the data requested from the national met. services as specified below.

Country	National met. service	Additional information (including any conditions on re-use)
Australia	Bureau of Meteorology	Based on the original temperature observations sourced from records held by the Australian Bureau of Meteorology
Austria	ZentralAnstalt für Meteorologie und Geodynamik (ZAMG)	Original data available from the Historical Instrumental Climatological Surface Time Series of the Greater Alpine Region (HISTALP) project
Bahamas	Dept of Meteorology
Bahrain	Bahrain Meteorological Service (BMS)
Barbados	Meteorological Services
Belgium
Bermuda	Bermuda Weather Service (BWS)
Bolivia
Bosnia-Herzegovina	Meteorological Institute
Canada	Environment Canada	Data from Vincent et al. (2012) supplied by Environment Canada (EC) via a direct communication in February 2012. The EC climate series are available from http://www.ec.gc.ca/dccha-ahccd/
Cape Verde
China	China Meteorological Administration (CMA)
Colombia	MdMA
Costa Rica
Cyprus	Meteorological Service
Czech
Denmark
Ecuador
Estonia
Finland	Finnish Meteorological Institute (FMI)	For research purposes only
France	Metéo-France
Gambia	Dept. of Water Resources
Germany	Deutscher Wetterdienst (DWD)	Agreed to release of all data classified as essential under WMO Res 40
Ghana
Greece	Hellenic National Meteorological Service (HNMS)
Guinea
Guinea-Bissau
Hungary
Ireland	Met Éireann
Israel	Israel Met Service
Italy
Japan	Japan Meteorological Agency (JMA)	All stations under ownership of JMA, excludes two stations run by US military in Japan
Kuwait
Liberia	Ministry of Transport	For research purposes only
Lithuania	Lithuanian Hydrometeorological Service
Luxembourg
Mauritius	Mauritius Meteorological Services	For research or educational purposes only
Nepal
Netherlands		Newly homogenised data from Schrier et al. (2011) provided through direct communication with KNMI.
New Zealand	Meteorological Service of New Zealand	Original data available online from New Zealand National Institute of Water and Atmospheric Research (NIWA) online Climate Database
Pakistan
Philippines	Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA)
Romania
Sao Tome
Singapore	Meteorological Services Division
Slovakia
Slovenia
Spain
Sweden
Switzerland	Meteo-Suisse
Thailand
Turkey
Uruguay	Direccion Nacional de Meteorologia
USA	National Oceanic and Atmospheric Administration (NOAA)
Uzbekistan	Uzhydromet
Zambia	Meteorological Dept

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