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GDO Standardized Precipitation Index JRA-3Q, 1-month accumulation period (SPI-1) (version 1.0.0)

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The 1-month Standardized Precipitation Index (SPI-1) is an indicator used to monitor meteorological drought based on precipitation anomalies over 1-month accumulation periods. SPI-1 serves as a proxy indicator for immediate impacts of droughts such as reduced soil moisture, snowpack, and flow in smaller creeks. The input data for calculating the SPI-1 is JRA-3Q precipitation reanalysis (Japanese Reanalysis for Three Quarters of a Century, by Japan Meteorological Agency (JMA; https://jra.kishou.go.jp/JRA-3Q/index_en.html).

Contributors

EDO European and Global Drought Observatories

How to cite

European Commission, Joint Research Centre (2026): GDO Standardized Precipitation Index JRA-3Q, 1-month accumulation period (SPI-1) (version 1.0.0). [Dataset] doi: 10.2905/JRC.67PKBY8 PID: http://data.europa.eu/89h/d6bd6322-a1a5-47a1-ad52-a69ea830e052

Keywords

CEMSCopernicusDroughtEuropean Drought Observatory (EDO)Global Drought Observatory (GDO)JMAJRA-3QPrecipitationPrecipitation AnomalySPI

Data access

Data Download Service URL
NetCDF

NetCDF is a set of software libraries and self-describing, machine-independent data formats that support the creation, access and sharing of array-oriented scientific data.
Downloadable file

A downloadable file for the dataset.

Use conditions
European Commission reuse notice

According to the European Commission reuse notice, reuse is authorised, provided the source is acknowledged. The reuse policy of the European Commission is implemented by the Decision of 12 December 2011. The general principle of reuse can be subject to conditions which may be specified in individual copyright notices. Therefore users are advised to refer to the copyright notices of the individual websites maintained under Europa and of the individual documents. Reuse is not applicable to documents subject to intellectual property rights of third parties.

Access conditions
No limitations

Anybody can directly and anonymously access the data, without being required to register or authenticate.

Other resources

Standardized Precipitation Index (SPI) Factsheet
PDF

PDF – Portable Document Format – is a file format developed to present documents, including text formatting and images, in a manner independent of application software, hardware and operating systems. Based on the PostScript language, each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, vector graphics, raster images and other information needed to display it. PDF was standardized as an open format and does not require any royalties for its implementation.

Use conditions
European Commission reuse notice

According to the European Commission reuse notice, reuse is authorised, provided the source is acknowledged. The reuse policy of the European Commission is implemented by the Decision of 12 December 2011. The general principle of reuse can be subject to conditions which may be specified in individual copyright notices. Therefore users are advised to refer to the copyright notices of the individual websites maintained under Europa and of the individual documents. Reuse is not applicable to documents subject to intellectual property rights of third parties.

Access conditions
No limitations

Anybody can directly and anonymously access the data, without being required to register or authenticate.

  • Factsheet

Publications

Publication
The relationship of drought frequency and duration to time scale.
McKee, T.B., N.J. Doesken and J. Kleist. 1993. The relationship of drought frequency and duration to time scale. In: Proceedingsof the Eighth Conference on Applied Climatology, Anaheim, California, 17–22 January 1993. Boston, American Meteorological Society, 179–184

Spatial coverage

Temporal coverage

From date To date
1991-01-01 N/A

Additional information

Published by
European Commission, Joint Research Centre
Contact email
JRC-EMS-DROUGHT (at) ec.europa.eu
Update frequency
three times a month

The event occurs three times a month.

Language(s)
English

English is a member of the West Germanic group of the Germanic languages. It is an official language of almost 60 sovereign states and is now a global lingua franca.It is the third-most-common native language in the world and it is widely learned as a second language.

Data theme(s)
Environment

dataset theme covering the domain of environment, defined as the interaction of all living species, climate, weather, and natural resources that impact human survival and economic activity

Geographical name(s)
World
Issued date
2025-02-21
Created date
21 Feb 2025 16:02
Modified date
21 Mar 2025 14:34
Landing page
https://drought.emergency.copernicus.eu/ 
Dataset identifier
http://data.europa.eu/89h/d6bd6322-a1a5-47a1-ad52-a69ea830e052
Other identifiers
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