Manufacturers Guidelines
I believe most booms are rated to be used up to 35 MPH winds. With that said, I know many have worked sustained winds that were higher with even higher gusts. When it goes bad it will fall on the operator of the boom. Companies try to keep lights on as long as possible and this sometimes leads to linemen ending up in situations they should not be in. As others have said...employees have the right to refuse to work in unsafe conditions.
Take only what you earn, give only what you can, learn to respect yourself before you can expect to respect anything or anyone else.