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Compendium on methods and tools to evaluate impacts of, and vulnerability and adaptation to, climate change

PRECIS (Providing REgional Climates for Impacts Studies)

PRECIS is essentially a regional climate modeling system. It is based on the third generation of the Hadley Centre’s regional climate model (HadRM3), together with user-friendly data processing and a visualization interface. Its flexible design allows for applications in any region of the world. Like any other regional climate model, PRECIS is driven by boundary conditions simulated by general circulation models (GCMs).

To facilitate the application, boundary conditions simulated by the Hadley Centre GCM experiments forced by four SRES marker scenarios are supplied with the software.

Appropriate Use PRECIS can be used to generate finer-resolution, physically consistent regional climate projections when GCM outputs are not sufficient to provide regional details as required by V&A assessment.
Scope Any region in the world (with a minimum area of 5,000km by 5,000 km) given that sufficient observed data are available to validate model outputs.
Key Output (Typically) hourly climate variables at approximately 50 km horizontal resolution.
Key Input Modeling domain, details of the driving GCM experiment, length of integration, specification of output files.
Ease of Use Requires considerable expertise in climate modeling.
Training Required Considerable knowledge and experience required.
Training Available Attendance at training workshops (funded from a variety of UK Government sources over the years) are a pre-condition of provision of PRECIS. To date workshops have been held in South Africa, Cuba, Bhutan, Brazil, India, Turkey, Argentina, Ghana, and five in the United Kingdom. Hadley Centre staff are subsequently available (via email etc.) for consultation. Further workshops are planned.
Computer Requirements A PC running the Linux operating system is required. It should have a minimum specification of a 1GHz processor, 500 Mb of memory, 60 Gb of disk space, and a tape drive to allow offline storage. A PC with a 1.4 GHz Athlon processor takes approximately 4~6 months to carry out a 30-year simulation.
Documentation Information on PRECIS is available at and covers aspects such as availability, support and requirements.

The model has been provided for use in several regions, including south Asia, central America, southern Africa and China. PRECIS modelling underlies sectoral impacts modelling work within Defra-funded research projects in India and China.

Contacts for Framework, Documentation, Technical Assistance

Hadley Centre

The Regional Modelling Group at the Hadley Centre, Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom, Tel: +441344.854938;
Fax: +44.1344.854898; e-mail:


The PRECIS DVD will be supplied to institutions free of charge (subject to the terms of the PRECIS license agreement) by the Hadley Centre only in conjunction with a PRECIS workshop . In keeping with the objectives behind the development of PRECIS, priority will be given to training users in developing countries, providing funding can be found to deliver the courses.

The software, together with a suite of supporting materials and boundary condition data, are provided free of charge to developing countries and countries with economy in transition. Users from institutions in developed countries will be assessed a charge of 5000 Euros plus 17.5% VAT. This charge contributes to the costs of development and providing training.


Please see for links to projects, reports and publications.