Where to find US airport weather Service Levels? Where can I find an airport's level of service for weather services?
In other words, how do I know if a given airport's Service Standard is a categorized as Service Level A, B, C and D?

For background, the FAA has determined Service Standards to categorize the levels of detail in weather observation sites. See the following from Appendix D of FAA JO 7900.5C (p. 152):

The term Service Standards refers to four levels of detail in weather observations at sites where there is a commissioned ASOS/AWSS. The first category, known as Service Level D, is completely automated service in which the ASOS/AWSS observation constitutes the entire observation, that is, no additional weather information is added by a human observer.
The second category, known as Service Level C, consists of all the elements of Service Level D, in addition to a human observer, who adds information to the automated observation. This is referred to as &quot;augmentation.&quot; [...] Service Level C is provided at all airports with a properly sited, fully qualified Federal facility during facility hours of operation. During hours that the facility is closed, the airport reverts to stand-alone ASOS or Service Level D as described above.
The highest category, referred to as Service Level A, includes major aviation hubs and high traffic volume airports with average or worse weather. The remaining group of airports (smaller hubs or special airports in other ways, that have worse than average bad weather operations for thunderstorms and/or
freezing/frozen precipitation, and/or that are remote airports) are referred to as Service Level B airports
The last of the service standards issued by the FAA was a 2014 report and ONLY available via a FOI request.

According to AJT-21, the yearly updates have been discontinued (without giving any reason that we are aware of).  Last "published" report was 2013.

If you wish to see it, please email @ wxobservers@yahoo.com