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Global Change Master Directory (GCMD)
World Water and Climate Atlas

Abstract: The IWMI World Water and Climate Atlas gives irrigation and agricultural planners rapid access to accurate data on climate and moisture availability for agriculture. The Atlas includes monthly and annual summaries for precipitation, temperature, humidity, hours of sunshine, evaporation estimates, wind speed, total number of days with and without rainfall, days without frost and Penman-Montieth reference evapotranspiration rates.

The core of the Atlas is data assembled from weather stations around the world for the period 1961-1990. Data can be extracted in summary, manipulated using the Atlas software, or exported in a standardized format for use in other applications. Users can also include their own local data for a more detailed picture of a particular area.

Applications include:

- identifying areas suitable for rainfed agriculture
- determining how much irrigation is needed in relation to what the climate provides
- providing inputs for hydrological modeling of river basins
- extracting climate inputs for crop modeling

Related URL
Link: View Related Information
Description: Climate Service model portal - The new IWMI Climate Atlas Web Query (CAWQuer) service creates online climate summaries for user-specified locations. All you have to do is enter the latitude and longitude coordinates for the location(s) you're interested in and specify which climate variables are needed. CAWQuer then searches over data in the IWMI Atlas and deliver climate summaries almost instantly. The data is displayed in an easy-to-read table, by month.

Description: Download the data viewer and climate grids.

The Synthesizer is a vehicle for viewing, managing, and analyzing geographic information in the form of spatially distributed data (grids), vectors (digital line graphs), labels, and time-series point data. It contains common GIS components along with enhanced tools for working with time-series point data such as those collected at climate stations. The specific tools in the Synthesizer allow users to organize data into common workable formats, view and manipulate that data according to specific needs, and analyze the results of the manipulation.

This software package:

- Utilizes existing climate grids for large regional and global scale reconnaissance studies.

- Provides a localization capability for working with national meteorological agencies and other groups to utilize local data sets which can provide much more detailed and accurate grids of specific areas.

- Enables researchers who are not GIS experts to easily conduct sophisticated analyses using climate and other data.

- Combines climate information with other information such as maps of river basins, population densities, vegetative indices from remote sensing, and the like to substantially improve the level and quality of GIS analysis in agriculture, water resources, and many other fields.

ISO Topic Category

WEATHER STATIONS    [Information]

RAIN GAUGES    [Information]
Thermometers    [Information]
ANEMOMETERS    [Information]
HUMIDITY SENSORS    [Information]

Access Constraints
The software is written for Windows 95/98. System resource requirements are based upon the data the user will be working with. We suggest a minimum of 32Mb of RAM (more memory improves performance) and 150Mb of available hard-disk space for the basic system. Data products range from a few megabytes to several gigabytes in size and are available on the web and CD-ROM. At present, large data products are only available on CD-ROM.

Data Access
Climate Model
Data Viewer
Geographic Information Systems
Weather Observations

Distribution_Media: Online
Fees: No fees

Phone: +94-11 2880000, 2784080
Fax: +94-11 2786854
Email: iwmi at
Contact Address:
P. O. Box 2075
City: Colombo
Country: Sri Lanka

Extended Metadata Properties
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Creation and Review Dates
SERF Creation Date: 2013-11-12
SERF Last Revision Date: 2013-11-13