European Commission logo
JRC Data Catalogue
DATASETCompleted

GDO Standardized Precipitation Index CHIRPS, 9-month accumulation period (SPI-9) (version 3.0.0)

QR code

The 9-month Standardized Precipitation Index (SPI-9) is an indicator used to monitor meteorological drought based on precipitation anomalies over 9-month accumulation periods. SPI-9 serves as a proxy indicator for medium-term impacts, such as reduced stream flow and reservoir storage. The input data for calculating the SPI-9 is CHIRPS (Climate Hazards Group InfraRed Precipitation with Station data) rainfall estimates from rain gauge and satellite observations, version 3.0, baseline 1991-2020.

Contributors

EDO European and Global Drought Observatories

How to cite

European Commission, Joint Research Centre (2026): GDO Standardized Precipitation Index CHIRPS, 9-month accumulation period (SPI-9) (version 3.0.0). [Dataset] doi: 10.2905/JRC.7PTG5X0 PID: http://data.europa.eu/89h/fe46e164-241f-40c0-9614-442c6e25d380

Keywords

CEMSCHIRPSCopernicusDroughtEuropean Drought Observatory (EDO)Global Drought Observatory (GDO)PrecipitationPrecipitation AnomalySPI

Data access

Data Download Service
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
monthly

The event occurs once 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

Issued date
2024-07-02
Created date
02 Jul 2024 10:26
Modified date
16 May 2025 13:01
Landing page
https://drought.emergency.copernicus.eu/ 
Dataset identifier
http://data.europa.eu/89h/fe46e164-241f-40c0-9614-442c6e25d380
Other identifiers
Rate this page
Please vote (optional).
An unhandled error has occurred. Reload 🗙