I have to admit, having been there (and having also missed numerous trips there too), to sticking to a Company Brief that states that no approach or departure is to be commenced unless the following conditions exist...
*there is no significant cloud below 15600' (MSA) within 25 nm along the valley either side of the airport.
*that the mountains within 5nm of the airport are completely clear of cloud. *visibility is greater than 7km.
*wind velocity at the airport is not greater than 20 kts.
I'd be interested to hear what other people use as a go/no go...thanks!!