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availability performance of the GCOS Surface Network (GSN) is obtained by selecting the following options in the WDQMS web tool: “surface” and “availability” in GCOS monitoring module and Monitoring category, respectively. The maps display the monthly availability performance for each GSN station highlighting the stations that are reporting (green), not reporting during the period (black), reporting but not registered in OSCAR/Surface (yellow) and not reporting and not registered in OSCAR/Surface (grey). The latter two categories pertain to metadata issues as the station Id is included in the monitoring report provided by DWD, but it can not be matched to a station in the GSN station baseline used in WDQMS web tool, which is retrieved from OSCAR/Surface and updated monthly. Clicking on a dot on the map shows a pop-up window with information about the station data availability for the selected month and a link to the station metadata in OSCAR/Surface. Moreover, clicking on “Time series” on the pop-up will display one year of the station monthly availability performance results.