Ground Observation Archives

Monthly Willmott and Matsuura Global Precipitation (1950 - 1999)

This interface is designed for visualization and analysis of the Monthly Willmott and Matsuura Global Precipitation (1950 - 1999).
Users can generate plots or ASCII Output for area average (Lat-Lon Map), time series (Time Series), and Hovmoller diagram. The animation is available for Lat-Lon Maps. Selecting here or the Help buttons will open a new window with detailed help. More details about the data are also available.

Help Button      

Alert: A new window may be opened when a link or a button is selected below.

Click and drag to select area; or input latitudes (-90, 90) and longitudes (-180 ~ 180) or
Click for non Java/JavaScript version
More information on supported browsers and platforms

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    (Data Begin: 1950/01)
    (Data   End: 1999/12)

Time Series Plot
Y-Axis Options:

Help Button      

Data Description

Cort Willmott Monthly Accumulated 0.5° x 0.5° Rainfall Data

Spatial coverage: 90°S - 90°N Global
Spatial resolution: 0.5° x 0.5°
Temporal resolution: Monthly
Documentations: README (text file)
README (html file)
Data Access: FTP download the original binary data file
FTP download the binary data file containing only monthly total precipitation

To learn about and order other precipitation products, please visit

Continued improvement of this online tool, and the production and dissemination of these data sets, depends on your (our users) informing us on how you have used this tool and these data. We are particularly interested in the value of this tool and these data sets to your research. Please send your comments to

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  • Last updated: June 02, 2011 16:38:57 GMT