The WDQMS web tool offers a RESTful API that enables users to access the same monitoring data displayed on the interactive maps. Through the API, users can directly download monitoring statistics in machine-readable formats, making it possible to automate data extraction, perform custom analyses, or integrate WDQMS information into another applications.

The base URL for accessing WDQMS web tool is:

 https://wdqms.wmo.int/wdqmsapi/v1/download/{module}/{type}/{period}/{category}/?request-parameters

 URL parameters

• module: Refers to the monitoring module (e.g., nwp, gbon)
• type: Refers to observation type (e.g., synop, temp) within the module.
• period: Refers to aggregation period (e.g., six_hour, daily, monthly). Note that there is no six_hour period for GBON module TEMP type.
• category: Refers to performance measure (e.g., availability, quality, timeliness). Note that there is no quality for GBON module.

Additional request parameters can be included as a query string (after ?) to refine the data request. 

 The Request parameters are:

• date: YYYY-mm-dd
• variable: temperature, pressure, zonal_wind, meridional_wind, humidity (for SYNOP type only)
• centers: [all, DWD, ECMWF, JMA, NCEP]
• period: [1,6,12,18] (for 6-hour views only)
• baseline : [oscar, hourly, 2-daily] (for NPW module only, and not for 6-hour TEMP)
• extra_columns: [nr_complete, gross_error_percent] (for NWP module TEMP availability and SYNOP module quality respectively)

When the type is marine surface the URL will only allow the quality category,  i.e.,

 marine_surface/{period}/quality/? (no monthly period)

In the case of GCOS module, there are these 4 possible combinations:

• gsn/availability/?date=YYYY-mm
• gsn/completeness/?date= YYYY-mm
• guan/availability/?date= YYYY-mm
• guan/quality/?date= YYYY-mm

Example: https://wdqms.wmo.int/wdqmsapi/v1/download/synop/six_hour/availability/?date=2024-11-18&period=18&variable=pressure&centers=DWD,ECMWF,JMA,NCEP&baseline=hourly