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 no six hour 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 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