Newps wrote:

So you're saying that the controllers are the weather observers there?
That would put it in a gray area. The book states that weather must be
available. If you received the clearance before the tower closed that
would be OK.


The book states only that "The reported ground visibility is at least 1
statute mile." The gray area is whether the last hourly observation is
still valid 15 minutes after the weather observer departs. It isn't
yet time for another hourly observation, but he isn't there to issue a
special observation if weather conditions change significantly.



Flight viz is irrelavant. The determining factor is reported ground viz.


The book (FAAO 7110.65) also states, "When executing a contact
approach, the pilot is responsible for maintaining the required flight
visibility, cloud clearance, and terrain/obstruction clearance." It
doesn't provide a hint where the requirement for flight visibility can
be found, however. The AIM states in paragraph 5-4-24 that pilots must
have at least one mile flight visibility, but it also states the
following in Flight Information Publication Policy:

"This publication, while not regulatory, provides information which
reflects examples of operating techniques and procedures which may be
requirements in other federal publications or regulations. It is made
available solely to assist pilots in executing their responsibilities
required by other publications."