It sounds like you and I may actually work for the same company. I have to go through a multi-phase bid' process via the company scheduling software, and all the choice traditional holidays are quickly exhausted, so I never schedule a trip around any major holiday as there's too much competition for those days off. No changes at all are permitted by the time we're in Q4 of the year for vacation days that same year. Phase 1 is seniority based, the other 'phases' are a free-for-all, first come, first served. After people have grabbed up all the major holidays, and then most of the Mondays and Fridays as well (creating long weekends) the bulk of the remaining 'unclaimed' days off will be assorted blocks of Tuesdays through Thursdays, can't build a dive vacation around such 'scraps'. Under these conditions I'm VERY conservative/careful about vacation scheduling during hurricane season, or 'norte season'.
Dear Scubafanatic,
Sounds like May--June is perfect for you. Early May might have a small norte but not very likely. Later the warmer!
Dave Dillehay
Aldora Divers