Sec. 87.525  Scope of service.

    Automatic weather observation stations must provide up-to-date 
weather information including the time of the latest weather sequence, 
altimeter setting, wind speed and direction, dewpoint, temperature, 
visibility and other pertinent data needed at airports having neither a 
full-time control tower nor a full-time FAA Flight Service Station. When 
a licensee has entered into an agreement with the FAA, an automatic 
weather observation station may also operate as an automatic terminal 
information station during the control tower's operating hours.