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CRUTEM5 Initial Release: CRUTEM.5.0.0.0

The data for CRUTEM.5.0.0.0 is available from this page. The most recent version CRUTEM5 is available from the HadCRUT5 versions page.

Version information

CRUTEM.5.0.0.0 is the version of CRUTEM5 that is presented in the CRUTEM5 paper (Osborn et al., 2020) and includes data for the years 1850 to 2019. Updates to this data set to include more recent data are available from the CRUTEM5 versions page.

CRUTEM5 data is provided here in NetCDF4 format.

Gridded data

The CRUTEM5 gridded data files contain air temperature anomaly information over land, mapped onto a regular 5-degree latitude by 5-degree longitude grid, together with associated uncertainty information.

Variable	NetCDF
Best estimate temperature anomalies	CRUTEM.5.0.0.0.anomalies.nc
Measurement and sampling error	CRUTEM.5.0.0.0.measurement_sampling.nc
Station error	CRUTEM.5.0.0.0.station_uncertainty.nc
Exposure and urbanisation biases terms (97.5% confidence)	CRUTEM.5.0.0.0.upper_bias.nc
Exposure and urbanisation biases terms (2.5% confidence)	CRUTEM.5.0.0.0.lower_bias.nc
Temperature anomalies for alternative grid	CRUTEM.5.0.0.0.alt.anomalies.nc
Number of stations per grid cell	CRUTEM.5.0.0.0.station_counts.nc

Time series

Regional average time series are provided for selected regions. Two varieties of time series files are provided. The summary series files provide best estimate series with upper and lower bounds on uncertainty. The component series files contain addition information on the contribution of each uncertainty source.

Summary series	Monthly	Annual
Global	Monthly	Annual
Northern hemisphere	Monthly	Annual
Southern hemisphere	Monthly	Annual

Uncertainty component series	Monthly	Annual
Global	Monthly	Annual
Northern hemisphere	Monthly	Annual
Southern hemisphere	Monthly	Annual

Station data

CRUTEM5 station files are provided in NetCDF4 format.

Station files	Zipped NetCDF4
Station files	Zipped NetCDF4

The station files are named according to each station's assigned station number. Each file contains information for a single station. Station files are named as [RRNNNC].nc, where RRNNNC is a 6-digit station ID number that is assigned by CRU. There are two forms of CRUTEM station numbers, indicated by the value of the final digit (C).

Where a station has (or had) a valid World Meteorological Organization (WMO) station index the final digit (C) takes a value of zero and is preceded by the WMO station index formatted as RRNNN, where RR is the WMO block number and NNN the station number.
Where no WMO station index is available, the final digit (C) takes a non-zero value, indicating that the preceding 5 digits have been assigned in production of CRUTEM are not a valid WMO station index.

The first two digits of the ID number (RR) indicate the WMO block number for the station’s location (except for 99, which includes stations from a variety of countries), according to the codes used by the WMO (e.g. 01 is Norway, 16 is Italy, Greece and Malta). See this list of WMO ID ranges for each country to identify the first two digits used for each country.

Examples of CRUTEM station numbers:

010010 - Jan Mayen, Norway. 01 is the code for Norway, and 001 the number designated by the Norwegian NMS. The sixth character here is a zero, indicating that this station has a valid WMO station index.
161331 - Mantova , Italy. 16 is the code for Italy, Greece and Malta, and 133 the number originally designated by the Italians. The sixth character is not a zero and this means the series is not known to have an official WMO station index.

A list of WMO station index ranges for each country is available from the WMO.

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