Periods of operation at longitude--current as well as historical. The historical list on Wikipedia is incomplete. Is there a single site with status of operational satellites (real-time) or do you have to go to every operator you can think of?
The WMO OSCAR database is a list of all Earth observation satellites¹. The resulting table can be sorted by orbit type, status (inactive/operation/planned), agency, and other aspects. From their own description:
This table shows all known past, current and future satellites for meteorological and earth observation purposes.It can be sorted by clicking on the column headers. The filter on the right allows to display only specific satellites.
A screenshot showing three GOES satellites and the scroll-bar on the right is shown below:
Note that OSCAR has a lot more capabilities than this. For anything Earth-observation-from-space related, it is a superb resource.
¹Except classified (spy) satellites...
I queried Wikidata for "instance of" = "weather satellite" and came up with this list:
Please remember that Wikidata still needs a huge amount of work, before queries can be judged accurate and complete (The project just started 2 years ago). If you need help improving the listing I can help you out, because I am heavily involved in Wikidata (Or coordinate your effort with the Space WikiProject: https://www.wikidata.org/wiki/Wikidata:WikiProject_Space). More complex queries will be possible in the future when data density increases (the query is missing the "operational status" you would like to query).